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| 1 | Denitrification characteristics of a marine origin psychrophilic aerobic denitrifying bacterium显示文摘A psychrophilic aerobic denitrifying bacterium,strain S1-1,was isolated from a biological aerated filter conducted for treatment of recirculating water in a marine aquaculture system.Strain S1-1 was preliminarily identified as Psychrobacter sp.based on the analysis of its 16S rRNA gene sequence,which showed 100% sequence similarity to that of Psychrobacter sp.TSBY-70.Strain S1-1 grew well either in high nitrate or high nitrite conditions with a removal of 100% nitrate or 63.50% nitrite,and the total nitrogen removal rates could reach to 46.48% and 31.89%,respectively.The results indicated that nitrate was mainly reduced in its logarithmic growth phase with a very low leve1 accumulation of nitrite,suggesting that the aerobic denitrification process of strain S1-1 occurred mainly in this phase.The GC-MS results showed that N 2 O was formed as the major intermediate during the aerobic denitrifying process of strain S1-1.Finally,factors affecting the growth of strain S1-1 and its aerobic denitrifying ability were also investigated.Results showed that the optimum aerobic denitrification conditions for strain S1-1 were sodium succinate as carbon source,C/N ratio15,salinity 10 g/L NaCl,incubation temperature 20°C and initial pH 6.5. | Haiyan Zheng Ying Liu Guangdong Sun Xiyan Gao Qingling Zhang Zhipei Liu | 2011 | Journal of Environmental Sciences2011，23，11： | 32 |
| 2 | A Stable, Wideband Tunable, Near Transform-Limited, Graphene- Mode-Locked, Ultrafast Laser显示文摘We report an ultrafast laser mode-locked with a graphene saturable absorber.The linear dispersions of the Dirac electrons in graphene enable wideband tunability.We get-1 ps pulses,tunable between 1525 and 1559 nm,with stable mode-locking,insensitive to environmental perturbations. | Zhipei Sun Daniel Popa Tawfique Hasan Felice Torrisi Fengqiu Wang Edmund J.R.Kelleher John C.Travers Valeria Nicolosi Andrea C.Ferrari | 2010 | Nano Research2010，3，9： | 24 |
| 3 | Assessment on heavy metals pollution of agricultural soil in Guanzhong District显示文摘The monitored soil samples were collected from Heihui irrigated area, Jiaokou irrigated area, Qianhe river valley and Jinghe river valley (hereafter Heihui, Jiaokou, Qianhe and Jinghe for short respectively) of Guanzhong District. According to the Environment Quality Standard for Soil (GB15618-1995II), we evaluated the pollution status of heavy metals (Cd, As, Cr and Pb) that could seriously endanger soil environment and human health by using single-factor index and synthetic pollution index methods. The results indicate that the synthetic pollution indices P of soil heavy metals are less than 0.7 in Heihui, Jiaokou, Qianhe and Jinghe of Guanzhong, the single-factor indices Pi of soil heavy metals of most soil samples are less than 0.7, so the soil environmental quality is in a good condition in Guanzhong on the whole; the enrichment degree of soil heavy metals is in the order of Heihui, Jinghe, Qianhe and Jiaokou; the contaminated degree of soil heavy metals has the feature of Cd > As > Cr > Pb; heavy metals contents in the cultivated horizon soil are generally higher than those in its underlayer soil, heavy metals contents of soil have the characteristic of enriching towards the cultivated horizon; Cd exceeds standard in the soil samples HS07a, b and HS08a, b at the Yangtao orchard in Heihui and in the soil sample QHS01a at the suburban vegetable plot in Qianhe, which was mainly caused by the long-term irrational use of chemical fertilizer and pesticide. | ZHENG Guozhang YUE Leping LI Zhipei CHEN Chao | 2006 | Journal of Geographical Sciences2006，16，1： | 21 |
| 4 | Enhanced biological nutrient removal by the alliance of a heterotrophic nitrifying strain with a nitrogen removing ecosystem显示文摘从合成废水的氮移动在一个空运生物反应器(白长袍的) 被调查,在器官的碳下面与新奇不是自养的硝化细菌 Pseudonocardia ammonioxydans H9T 扩充了到从 0 ~ 12 的氮比率(Corg/N ) 。接种紧张的效果也在安定性质和化学的氧需求(货到付款) 的移动上被决定。二个实验室规模反应堆被设置完成在水力的保留的一样的物理化学的条件下面使状态硝化的一个马厩时间(HRT ) ,温度, pH 和溶解的氧() ,并且在定序的批模式下面操作了。水平在 0.5 1.5 mg/L 被保留由周期激动人心并且通风。每特定的 Corg/N 比率为 3 个星期的持续时间被继续。反应堆(BR2 ) 之一与 P 被接种。ammonioxydans H9T 周期性地在每 Corg/N 比率的开始。污泥容量的索引(SVI ) 与增加的 Corg/N 比率改善了,但是没有重要差别在二个反应堆之间被检测。BR2 与增加显示出氮移动的高水平不是自养的条件,和氨移动到达了到水平 82%88% ,在在在比 6 高的 Corg/N 比率的控制反应堆(BR1 ) 的比那高的 to10% 上面;然而,在试验性的反应堆的氨移动水平是多达 8% 比在在 Corg/N 的控制反应堆,比率比 2 降低降低。货到付款移动效率日益增多地反应堆在两个与增加的 Corg/N 比率增加了。货到付款移动百分比直到山峰价值 88%94% 在 BR2,多达 11% 比那高在在比 4 高的 Corg/N 比率的 BR1。氨和货到付款移动的山峰价值几乎与最高的数字与一致(18%27% 总计细菌的数字) 在 BR2 的外长的细菌,作为殖民地形成检测了单位(CFU ) 。而且,在 BR2 的氨和货到付款的移动是仔细与有为氨和货到付款的直到 0.82 和 0.85 的一个系数索引(R2 ) 的接种紧张的数字有关分别地。这些结果建议它在在高 Corg/N 比率与一个不是自养的硝化细菌接种的一个反应堆为氨和碳营养素移动是更有效的,推断不是自养的 nitrifers 将在有氨和货到付款的高水平的废水的处理实际上是更可得到的。 | Naeem ud din Ahmad XU Haiying CHEN Liping LIU Zhipei LIU Shuangjiang | 2008 | Journal of Environmental Sciences2008，20，2： | 17 |
| 5 | Preliminary investigation on the role of microorganisms in the production of phosphine显示文摘The relationships between the phosphine content and various microbial populations,activities of different enzymes were investigated firstly.The results indicated that the phosphine content of samples from various environments was positively related to total anaerobic microorganisms,organic phosphate compound-dissolving bacteria,denitrifying bacteria,and the activities of alkaline phosphatase and dehydrogenase,with correlation coefficients (R^2) up to 0.93,0.90,0.69,0.79,and 0.82,respectively.Results also... | LIU Zhipei JIA Shengfen WANG Baojun | 2008 | Journal of Environmental Sciences2008，20，7： | 10 |
| 6 | A novel and complete gene cluster involved in the degradation of aniline by Delftia sp. AN3显示文摘A recombinant strain, Escherichia coli JM109-AN1, was obtained by constructing of a genomic library of the total DNA of Delftia sp. AN3 in E. coli JM109 and screening for catechol 2,3-dioxygenase activity. This recombinant strain could grow on aniline as sole carbon, nitrogen and energy source. Enzymatic assays revealed that the exogenous genes including aniline dioxygenase (AD) and catechol 2,3-dioxygenase (C23O) genes could well express in the recombinant strain with the activities of AD and C23O up to 0.31 U/mg wet cell and 1.92 U/mg crude proteins, respectively. The AD or C23O of strain AN3 could only catalyze aniline or catechol but not any other substituted substrates. This recombinant strain contained a recombinant plasmid, pKC505-AN1, in which a 29.7-kb DNA fragment from Delftia sp. AN3 was inserted. Sequencing and open reading frame (orfs) analysis of this 29.7 kb fragment revealed that it contained at least 27 orfs, among them a gene cluster (consisting of at least 16 genes, named danQTA1A2BRDCEFG1HIJKG2) was responsible for the complete metabolism of aniline to TCA-cycle intermediates. This gene cluster could be divided into two main parts, the upper sequences consisted of 7 genes (danQTA1A2BRD) were predicted to encode a multi-component aniline dioxygenase and a LysR-type regulator, and the central genes (danCEFG1HIJKG2) were expected to encode meta-cleavage pathway enzymes for catechol degradation to TCA-cycle intermediates. Unlike clusters tad from Delftia tsuruhatensis AD9 and tdn from Pseudomonas putida UCC22, in this gene cluster, all the genes were in the same transcriptional direction. There was only one set of C23O gene (danC) and ferredoxin-like protein gene (danD). The presence of only one set of these two genes and specificity of AD and C23O might be the reason for strain AN3 could only degrade aniline. The products of danQTA1A2BRDC showed 99%–100% identity to those from Delftia acidovorans 7N, and 50%–85% identity to those of tad cluster from D. tsuruhatensis AD9 in amino acid residues. Besides this dan cluster, the 29.7 kb fragment also contained genes encoding the trans-membrane transporter and transposases which might be needed for transposition of the gene cluster. Pulsed-field gel electrophoresis (PFGE) and plasmid curing experiments suggested that the dan cluster might be encoded on the chromosome of strain AN3. The GenBank accession number for the dan cluster of Delftia sp. AN3 is DQ661649. | ZHANG Tao ZHANG Jinglei LIU Shuangjiang LIU Zhipei | 2008 | Journal of Environmental Sciences2008，20，6： | 10 |
| 7 | Microbiome analysis and-omics studies of microbial denitrification processes in wastewater treatment: recent advances显示文摘Nitrogen pollution is an increasingly severe worldwide problem because of drainage of nitrogen-containing wastewater and intensive application of nitrogen-containing fertilizers. Denitrification, a key process in nitrogen cycles, is commonly employed for nitrogen removal in engineered wastewater treatment systems. Biological denitrification is performed by denitrifying microbes(bacteria) that use nitrate as terminal electron acceptor. Better understanding the functions of diverse microbial populations in denitrification-based wastewater treatment systems, and the interactions of these populations with operating environments, is essential for improving both treatment performance and system stability. Recent advances in 'meta-omics'(e.g., genomics, transcriptomics, proteomics, metabolomics), other molecular biology tools, and microbiome analysis have greatly enhanced such understanding. This minireview summarizes recent findings regarding microbial community structure and composition, key functional microbes and their physiology, functional genes involved in nitrogen cycle, and responses of microbes and their genes to changes of environmental factors or operating parameters, in denitrification processes in wastewater treatment systems. Of particular interest are heterotrophic denitrification systems(which require alternative organic carbon sources) and the autotrophic denitrification systems(which do not require an external carbon source). Integrated microbiome and-omics approaches have great future potential for determination of optimal environmental and biotechnological parameters,novel process development, and improvement of nitrogen removal efficiency and system stability. | Lili Miao Zhipei Liu | 2018 | Science China(Life Sciences)2018，61，7： | 8 |
| 8 | Evolution of the Ordos Plateau and environmental effects显示文摘Based on the analysis of temporary-spatial distribution, geomorphic position, contact relationship with underlying strata and grain size of red clay, we studied the formation and environmental background of red clay. During late Miocene-Pliocene, the Ordos Block finished the transformation from the basin to the plateau, which had an obvious environmental effect on the topography, indicated by the formation of highland undergoing wind erosion and lowland receiving red clay deposits. The red clay materials were sourced from dusts carried by wind energy and covered on the initial topography. Unlike Quaternary loess dust covering the overall the Loess Plateau, red clay deposited on the highland would be transported to the lowlands by wind and fluvial process. As a result, there was no continuous 'Red Clay Plateau' in the Ordos region and red clay was only preserved in former lowlands. However, red clay was discontinuously distributed through the Loess Plateau and to some extent modified the initial topography. The differential uplift in interior plateau is indicated by the uplift of northern Baiyushan, central Ziwuling and southern Weibeibeishan. The Weibeibeishan Depression formed earlier and became the sedimentary center of red clay resulting in the thicker red clay deposits in Chaona, Lingtai and Xunyi. Since Quaternary the aridity in the northern plateau enhanced and accelerated loess accumulation caused the formation of the Loess Plateau. During the late Pleistocene the rapid uplift led to the enhancement of erosion. Especially after the cut-through of Sanme Lake by the Yellow River, the decline of base level caused the falling of ground water level and at the same time the increase of drainage density resulting in the enhancement of evaporation capacity, which enhanced the aridity tendency of aridity in the Loess Plateau region. | YUE LePing LI JianXing ZHENG GuoZhang LI ZhiPei | 2007 | Science China Earth Sciences2007，50，z2： | 8 |
| 9 | Screening and degrading characteristics and community structure of a high molecular weight polycyclic aromatic hydrocarbon-degrading bacterial consortium from contaminated soil显示文摘Inoculation with effcient microbes had been proved to be the most important way for the bioremediation of polluted environments. For the treatment of abandoned site of Beijing Coking Chemical Plant contaminated with high level of high-molecular-weight polycyclic aromatic hydrocarbons(HMW-PAHs) ,a bacterial consortium capable of degrading HMW-PAHs,designated 1-18-1,was enriched and screened from HMW-PAHs contaminated soil.Its degrading ability was analyzed by high performance liquid chromatography(HPLC) ,and the community structure was investigated by construction and analyses of the 16S rRNA gene clone libraries(A,B and F) at different transfers.The results indicated that 1-18-1 was able to utilize pyrene,fluoranthene and benzoapyrene as sole carbon and energy source for growth.The degradation rate of pyrene and fluoranthene reached 82.8%and 96.2%after incubation for 8 days at 30°C,respectively;while the degradation rate of benzoapyrene was only 65.1%after incubation for 28 days at 30°C. Totally,108,100 and 100 valid clones were randomly selected and sequenced from the libraries A,B,and F.Phylogenetic analyses showed that all the clones could be divided into 5 groups,Bacteroidetes,α-Proteobacteria,Actinobacteria,β-Proteobacteria andγ-Proteobacteria.Sequence similarity analyses showed total 39 operational taxonomic units(OTUs) in the libraries.The predominant bacterial groups wereα-Proteobacteria(19 OTUs,48.7%) ,γ-Proteobacteria(9 OTUs,23.1%) andβ-Proteobacteria(8 OTUs,20.5%) . During the transfer process,the proportions ofα-Proteobacteria andβ-Proteobacteria increased greatly(from 47%to 93%) ,while γ-Proteobacteria decreased from 32%(library A) to 6%(library F) ;and Bacteroidetes group disappeared in libraries B and F. | Run Sun Jinghua Jin Guangdong Sun Ying Liu Zhipei Liu | 2010 | Journal of Environmental Sciences2010，22，10： | 8 |
| 10 | Evolution of surface microstructure of Cu-50Cr alloy treated by high current pulsed electron beam显示文摘A Cu-50Cr alloy was treated by the high current pulsed electron beam(HCPEB)at 20 and 30 ke V with pulse numbers ranging from 1 to 100.Surface morphologies and microstructures of specimens before and after the treatments were investigated by employing scanning electron microscopy and X-ray diffraction.Results show that the HCPEB technique is able to induce remarkable surface modifications for the Cu-50Cr alloy.Cracks in Cr phases appear even after one-pulse treatment and their density always increases with the pulse number.Formation reason for these cracks is attributed to quasi-static thermal stresses accumulated along the specimen surface.Craters with typical morphologies are formed due to the dynamic thermal field induced by the HCPEB and they are found to prefer the sites near cracks or boundaries between neighboring Cr phases.Another microstructural characteristic produced by the HCPEB is the fine Cr spheroids,which are determined to be due to occurrence of liquid phase separation in the Cu-50Cr alloy.Finally,a general microstructural evolution profile that incorporates various HCPEB-induced surface features is tentatively outlined. | CHAI LinJiang ZHOU ZhiMing XIAO ZhiPei TU Jian WANG YaPing HUANG WeiJiu | 2015 | Science China(Technological Sciences)2015，58，3： | 5 |
| 11 | Ultrafast Stretched-Pulse Fiber Laser Mode-Locked by Carbon Nanotubes显示文摘Ultrafast fiber sources having short pulses, broad bandwidth, high energy, and low amplitude fluctuations have widespread applications. Stretched-pulse fiber lasers, incorporating segments of normal and anomalous dispersion fibers, are a preferred means to generate such pulses. We realize a stretched-pulse fiber laser based on a nanotube saturable absorber, with 113 fs pulses, 33.5 nm spectral width and ~0.07% amplitude fluctuation, outperforming current nanotube-based designs. | Zhipei Sun Tawfique Hasan Fengqiu Wang Aleksey G.Rozhin Ian H.White Andrea C.Ferrari | 2010 | Nano Research2010，3，6： | 4 |
| 12 | A bioaugmentation failure caused by phage infection and weak biofilm formation ability显示文摘Two biological aerated filters (BAF) were setup for ammonia removal treatment of the circulation water in a marine aquaculture. One of the BAFs was bioaugmented with a heterotrophic nitrifying bacterium, Lutimonas sp. H10, where the ammonia removal was not improved and the massive inoculation was even followed by a nitrification breakdown from day 9 to 18. The nitrification was remained stable in control BAF operated under the same conditions. Fluorescent in situ hybridization (FISH) with rRNA-targeted probes and cultivable method revealed that Lutimonas sp. H10 almost disappeared from the bioaugomented BAF within 3 d, and this was mainly due to the infection of a specific phage as revealed by flask experiment, plaque assay and transmission electron observation. Analyses of 16S rRNA gene libraries showed that bacterial groups from two reactors evolved differently and an overgrowth of protozoa was observed in the bioaugmented BAF. Therefore, phage infection and poor biofilm forming ability of the inoculated strain are the main reasons for bioaugmentation failure. In addition, grazing by protozoa of the bacteria might be the reason for the nitrification breakdown in bioaugmented BAF during day 9–18. | FU Songzhe FAN Hongxia LIU Shuangjiang LIU Ying LIU Zhipei | 2009 | Journal of Environmental Sciences2009，21，8： | 4 |
| 13 | Advances in microvascular decompression for hemifacial spasm显示文摘Primary hemifacial spasm(HFS) is a disorder that causes frequent involuntary contractions in the muscles on one side of the face, due to a blood vessel compressing the nerve at its root exit zone(REZ) from the brainstem. Numerous prospective and retrospective case series have confirmed the efficacy of microvascular decompression(MVD) of the facial nerve in patients with HFS. However, while MVD is effective, there are still significant postoperative complications. In this paper, recent technological advances related to MVD(such as lateral spread response,brainstem auditory evokes potential, three dimensional time of flight magnetic resonance angiography, intraoperative neuroendoscopy) are reviewed for the purposes of improving MVD treatment efficacy and reducing postoperative complications. | Zhiqiang Cui Zhipei Ling | 2015 | Journal of Otology2015，10，1： | 4 |
| 14 | Phase-matching-induced near-chirp-free solitons in normal-dispersion fiber lasers显示文摘Direct generation of chirp-free solitons without external compression in normal-dispersion fiber lasers is a long-term challenge in ultrafast optics.We demonstrate near-chirp-free solitons with distinct spectral sidebands in normaldispersion hybrid-structure fiber lasers containing a few meters of polarization-maintaining fiber.The bandwidth and duration of the typical mode-locked pulse are 0.74 nm and 1.95 ps,respectively,giving the time-bandwidth product of 0.41 and confirming the near-chirp-free property.Numerical results and theoretical analyses fully reproduce and interpret the experimental observations,and show that the fiber birefringence,normal-dispersion,and nonlinear effect follow a phase-matching principle,enabling the formation of the near-chirp-free soliton.Specifically,the phasematching effect confines the spectrum broadened by self-phase modulation and the saturable absorption effect slims the pulse stretched by normal dispersion.Such pulse is termed as birefringence-managed soliton because its two orthogonal-polarized components propagate in an unsymmetrical“X”manner inside the polarization-maintaining fiber,partially compensating the group delay difference induced by the chromatic dispersion and resulting in the selfconsistent evolution.The property and formation mechanism of birefringence-managed soliton fundamentally differ from other types of pulses in mode-locked fiber lasers,which will open new research branches in laser physics,soliton mathematics,and their related applications. | Dong Mao Zhiwen He Yusong Zhang Yueqing Du Chao Zeng Ling Yun Zhichao Luo Tijian Li Zhipei Sun Jianlin Zhao | 2022 | Light(Science & Applications)2022，11，2： | 3 |
| 15 | Stochastic stabilization using aperiodically sampled measurements显示文摘This paper addresses the stabilization problem of sector-bounded nonlinear systems with sampled measurements via discrete-time stochastic feedback control. Unlike the previous studies, the closed-loop system is modeled as an impulsive stochastic differential equation. By developing a quasi-periodic polynomial Lyapunov function and sampling-time-dependent Lyapunov function based methods, two sufficient conditions for almost sure exponential stability are derived in terms of differential matrix inequalities(DMIs) and linear matrix inequalities(LMIs). It is shown that the DMI-based conditions can be formulated as a sum of squares(SOSs). Moreover, the obtained results are adapted to sampled-data stochastic/deterministic systems. The numerical examples illustrate the theoretical results. | Shixian LUO Feiqi DENG Xueyan ZHAO Zhipei HU | 2019 | Science China(Information Sciences)2019，62，9： | 2 |
| 16 | A NEW DATA ASSOCIATION ALGORITHM USING PROBABILITY HYPOTHESIS DENSITY FILTER显示文摘Probability Hypothesis Density (PHD) filtering approach has shown its advantages in tracking time varying number of targets even when there are noise,clutter and misdetection. For linear Gaussian Mixture (GM) system,PHD filter has a closed form recursion (GMPHD). But PHD filter cannot estimate the trajectories of multi-target because it only provides identity-free estimate of target states. Existing data association methods still remain a big challenge mostly because they are com-putationally expensive. In this paper,we proposed a new data association algorithm using GMPHD filter,which significantly alleviated the heavy computing load and performed multi-target trajectory tracking effectively in the meantime. | Huang Zhipei Sun Shuyan Wu Jiankang | 2010 | Journal of Electronics(China)2010，27，2： | 2 |
| 17 | Decolorization and bio degradation metabolism of azo dyes by Pseudomonas S-42显示文摘A bacterial strain was isolated from activated sludge and has been identified as Pseudomonas sp. S-42 capable of decolorizing azo dyes such as Diamira Brilliant Orange RR (DBO-RR), Direct Brown M (DBM), Eriochrome Brown R (EBR) and so on. The growing cells, intact cells, cell-free extract and purified enzyme of strain S-42 could decolorize azo dyes under similar conditions at the optimum pH 7.0 and temperature of 37℃. The efficiencies of decolorization for DBO-RR, DBM, EBR with intact cells stood more than 90%. When the cell concentration was 15mg (wet)/ml and the reaction time was 5 hours, the decolorizing activities of intact cells for above three azo dyes were 1.75, 2.4, 0.95 μg dye/mg cell, respectively. Cell-free extract and purified enzyme belonged to azoreductase with molecular weight about 34000±2000 and Vmax and Km values for DBO-RR of 13μmol/mg protein/nun and 54μmol, respectively. The results from the detection of the biodegradation products of DBO-RR by spectrophotometric and NaNO2 | Liu Zhipei and Yang HaifangInstitute of Microbiology,Academis Sinica,Beijing 100080,China | 1991 | Journal of Environmental Sciences1991，3，2： | 2 |
| 18 | The Experimental Research on Near—threshold Behaviors of Erbium—doped—fiber Ring Resonator显示文摘 | Yu Benli Sun Zhipei | 2002 | 量子电子学报2002，19，1： | 2 |
| 19 | Giant Valley Coherence at Room Temperature in 3R WS_(2) with Broken Inversion Symmetry显示文摘Breaking the space-time symmetries in materials can markedly influence their electronic and optical properties.In 3R-stacked transition metal dichalcogenides,the explicitly broken inversion symmetry enables valley-contrasting Berry curvature and quantization of electronic angular momentum,providing an unprecedented platform for valleytronics.Here,we study the valley coherence of 3R WS_(2) large single-crystal with thicknesses ranging from monolayer to octalayer at room temperature.Our measurements demonstrate that both A and B excitons possess robust and thickness-independent valley coherence.The valley coherence of direct A(B)excitons can reach 0.742(0.653)with excitation conditions on resonance with it.Such giant and thickness-independent valley coherence of large single-crystal 3R WS_(2) at room temperature would provide a firm foundation for quantum manipulation of the valley degree of freedom and practical application of valleytronics. | Luojun Du Jian Tang Jing Liang Mengzhou Liao Zhiyan Jia Qinghua Zhang Yanchong Zhao Rong Yang Dongxia Shi Lin Gu Jianyong Xiang Kaihui Liu Zhipei Sun Guangyu Zhang | 2019 | Research2019，，1： | 2 |
| 20 | Ultrafast transient sub-bandgap absorption of monolayer MoS2显示文摘The light-matter interaction in materials is of remarkable interest for various photonic and optoelectronic applications,which is intrinsically determined by the bandgap of the materials involved.To extend the applications beyond the bandgap limit,it is of great significance to study the light-matter interaction below the material bandgap.Here,we report the ultrafast transient absorption of monolayer molybdenum disulfide in its sub-bandgap region from-0.86 pm to 1.4 pm.Even though this spectral range is below the bandgap,we observe a significant absorbance enhancement up to-4.2%in the monolayer molybdenum disulfide(comparable to its absorption within the bandgap region)due to pump-induced absorption by the excited carrier states.The different rise times of the transient absorption at different wavelengths indicate the various contributions of the different carrier states(i.e.,real carrier states in the short-wavelength region of~<1μm,and exciton states in the long wavelength region of~>1μm).Our results elucidate the fundamental understanding regarding the optical properties,excited carrier states,and carrier dynamics in the technologically important near-infrared region,which potentially leads to various photonic and optoelectronic applications(e.g„excited-state-based photodetectors and modulators)of two-dimensional materials and their heterostructures beyond their intrinsic bandgap limitations. | Susobhan Das Yadong Wang Yunyun Dai Shisheng Li Zhipei Sun | 2021 | Light(Science & Applications)2021，10，2： | 1 |
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