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 2021학년도 1학기 콜로퀴움 일정 2021.01.13 11234
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 604770
280 <6/21> Nuclear Astrophysics in Effective Field Theories 2012.06.20 57785
279 <7월27일>Correlated topological phases in 3D complex oxides via Green's functions 2012.07.27 56111
278 <8/7> Scotch tape and spectroscopy: probing and manipulating the surface of a topological insulator 2012.07.27 53762
277 <9/7(금)> Kondo Effect in Chiral Orbital Bands 2012.08.31 53639
276 <9/7> On Dark Matter and its indirect detection with box-shaped gamma-rays 2012.09.05 53165
275 <9/14> High temperature superconductivity and fluctuating stripe 2012.09.10 52672
274 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 56262
273 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 60089
272 <10/5> Gauge fields. Past, present, future. 2012.10.05 52985
271 <10/12> Kondo Effect in a Quantum-Dot-Topological-Superconductor Junction: A Numerical Renormalization Group Analysis 2012.10.08 57925
270 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 57234
269 <11/22> Spin polarization of photoelectrons from a topological insulator 2012.10.22 54209
268 <10/24> Dung-hai Lee 교수와의 간담회 2012.10.23 54166
267 <11/5> Optical spectroscopic probe on the surface state in three dimensional topological insulators 2012.10.24 56026
266 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 65354
265 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 69865
264 <11/28> Extremal Black Holes and Holographic C-theorem 2012.11.28 55516
263 <12/21(금)> Generic quantum spin ice 2012.12.03 56156
» <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 56502
261 <12/12> lattice structure in holographic models 2012.12.12 55674