korean english


Home > 게시판 > 세미나

아래와 같이 세미나를 개최하오니 많이 참석해 주시기 바랍니다.


                    아       래


제목: Theory of topological quantum phase transitions in 3D noncentrosymmetric systems


연사: 양   범   정 박사님 (RIKEN, 일본)


일시: 2012. 12. 21(금) 오후 2시

장소: 도서관 세미나 실


초록: In this talk, I am going to propose a general theory for topological quantum phase transitions, accessible via an accidental band crossing, in 3D systems with broken inversion symmetry. Although the consideration of the system's codimension predicts the appearance of a stable metallic phase between the normal and topological insulators, when the band touching occurs along the direction with high crystalline symmetry, a direct topological phase transition between two insulators can also occur. At the quantum critical point (QCP), the energy dispersion becomes quadratic along one direction while the dispersions along the other two orthogonal directions are linear, which manifests the zero chirality of the band touching point. When a direct transition between two insulators happens, as a result of the band inversion, the conduction (valence) band develops a saddle point near the dispersion minimum (maximum) across the topological phase transition. Due to the anisotropic dispersion at QCP, various thermodynamic and transport properties show unusual temperature dependence and anisotropic behaviors. Also using the perturbative renormalization group approach, it is shown that the Gaussian fixed point is stable against the random disorder potential and $1/r$ Coulomb interaction.

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1060366
681 2019학년도 2학기 콜로퀴움 일정 2019.07.17 425084
680 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 366070
679 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 324897
678 2017학년도 1학기 콜로퀴움 일정 2017.01.05 286716
677 <10/25> Wave properties of dipole-exchange spin waves in confined magnetic thin films 2006.10.25 274168
676 <5/16> 물리학자가 바라 본 단백질: 왜, 어떻게 연구하는가? 2012.05.10 254809
675 2020학년도 1학기 콜로퀴움 일정 2020.01.31 253498
674 BK 석학초청 특별세미나 - Frustration and dimensional reduction in multi-orbital systems 2011.10.28 249019
673 <6/11> Advanced Physiological Optics and Its Ophthalmic Applications 2014.05.28 238636
672 <3/14>Adaptive Optics for the Human Eye and Ophthalmic Applications 2008.03.12 237608
671 <11/6> Graphene plasmon and Plasmonics 2013.10.31 237344
670 <8/30(Wed.)10:30>​Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics 2017.08.29 231942
669 <6/17> Oscillating Fuzzy Sphere and M5/anti M5 configurations in ABJM model 2009.06.16 231096
668 <12/21> Special Seminar by Professor Ilya Vekhter 2010.11.30 229455
667 <11/5(화)> 특별세미나 개최 안내 2013.11.01 224086
666 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 222411
665 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 219147
664 <5/16(토)> 세미나 개최 안내 2015.05.18 208134
663 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 200891