logo

korean english

게시판

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 1079043
685 2019학년도 2학기 콜로퀴움 일정 2019.07.17 426722
684 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 403466
683 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 344545
682 2017학년도 1학기 콜로퀴움 일정 2017.01.05 306794
681 <10/25> Wave properties of dipole-exchange spin waves in confined magnetic thin films 2006.10.25 296370
680 <5/16> 물리학자가 바라 본 단백질: 왜, 어떻게 연구하는가? 2012.05.10 269398
679 <6/11> Advanced Physiological Optics and Its Ophthalmic Applications 2014.05.28 258959
678 2020학년도 1학기 콜로퀴움 일정 2020.01.31 254683
677 BK 석학초청 특별세미나 - Frustration and dimensional reduction in multi-orbital systems 2011.10.28 252944
676 <3/14>Adaptive Optics for the Human Eye and Ophthalmic Applications 2008.03.12 248470
675 <6/17> Oscillating Fuzzy Sphere and M5/anti M5 configurations in ABJM model 2009.06.16 247159
674 <12/21> Special Seminar by Professor Ilya Vekhter 2010.11.30 244457
673 <8/30(Wed.)10:30>​Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics 2017.08.29 244151
672 <11/6> Graphene plasmon and Plasmonics 2013.10.31 240711
671 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 238274
670 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 236019
669 <11/5(화)> 특별세미나 개최 안내 2013.11.01 230242
668 <5/16(토)> 세미나 개최 안내 2015.05.18 217183
667 <Sep. 23(Wed.) 4:30 PM>Grain boundary effect in Metal : A journey of discovery from crystal to thin films without grain boundaries 2015.09.16 208963