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| 1 | Higher-order topological insulators in synthetic dimensions显示文摘Conventional topological insulators support boundary states with dimension one lower than that of the bulk system that hosts them,and these states are topologically protected due to quantized bulk dipole moments.Recently,higherorder topological insulators have been proposed as a way of realizing topological states with dimensions two or more lower than that of the bulk due to the quantization of bulk quadrupole or octupole moments.However,all these proposals as well as experimental realizations have been restricted to real-space dimensions.Here,we construct photonic higher-order topological insulators(PHOTIs)in synthetic dimensions.We show the emergence of a quadrupole PHOTI supporting topologically protected corner modes in an array of modulated photonic molecules with a synthetic frequency dimension,where each photonic molecule comprises two coupled rings.By changing the phase difference of the modulation between adjacent coupled photonic molecules,we predict a dynamical topological phase transition in the PHOTI.Furthermore,we show that the concept of synthetic dimensions can be exploited to realize even higher-order multipole moments such as a fourth-order hexadecapole(16-pole)insulator supporting 0D corner modes in a 4D hypercubic synthetic lattice that cannot be realized in real-space lattices. | Avik Dutt Momchil Minkov Ian A.D.Williamson Shanhui Fan | 2020 | Light(Science & Applications)2020，9，1： | 3 |
| 2 | Free radical reactionsmight contribute to severe alpha amanitin hepatotoxicity-AHypoth-esis显示文摘 | Toaneta Z Anna T Momchil Z | 2007 | Medical Hypotheses2007，69，： | 1 |
| 3 | Effect of carbon nanofibers on tensile and compressive characteristics of hollow particle filled composites显示文摘 | Momchil Dimchev Ryan Caeti Nikhil Gupta | 2009 | Materials and Design2009，，3： | 1 |
| 4 | Effect of carbon nanofibers on tensile and compressive characteristics of hollow particle filled composites显示文摘 | Momchil Dimchev Ryan Caeti Nikhil Gupta | | 0，，03： | 1 |
| 5 | Effects of dopamine D_(1) receptor blockade on the ERG b- and d-waves during blockade of ionotropic GABA receptors显示文摘Background:Some data indicate that the dopaminergic and GABAergic systems interact in the vertebrate retina,but the type of interactions is not well understood.Methods:In this study we investigated the effect of dopamine D_(1) receptor blockade by 75μM SCH 23390 on the electroretinographic ON(b-wave)and OFF(d-wave)responses in intact frog eyecup preparations and in eyecups where the ionotropic GABA receptors were blocked by 50μM picrotoxin.Student’s t-test,One-way repeated measures ANOVA with Bonferroni post-hoc test and Two-way ANOVA were used for statistical evaluation of the data.Results:We found that SCH 23390 alone significantly enhanced the amplitude of the b-and d-waves without altering their latency.The effect developed rapidly and was fully expressed within 8-11 min after the blocker application.Picrotoxin alone also markedly enhanced the amplitude of the ERG ON and OFF responses and increased their latency significantly.The effect was fully expressed within 25-27 min after picrotoxin application and remained very stable in the next 20 min.The effects of SCH 23390 and picrotoxin are similar to that reported in our previous studies.When SCH 23390 was applied on the background of the fully developed picrotoxin effect,it diminished the amplitude of the b-and d-waves in comparison to the corresponding values obtained during application of picrotoxin alone.Conclusion:Our results demonstrate that the enhancing effect of D_(1) receptor blockade on the amplitude of the ERG b-and d-waves is not evident during the ionotropic GABA receptor blockade,indicating an interaction between these neurotransmitter systems in the frog retina.We propose that the inhibitory effect of endogenous dopamine mediated by D_(1) receptors on the ERG ON and OFF responses in the frog retina may be due to the dopamine-evoked GABA release. | Elka Popova Momchil Kostov Petia Kupenova | 2016 | Eye and Vision2016，3，1： | 0 |
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