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 1059014
296 <6/21> Nuclear Astrophysics in Effective Field Theories 2012.06.20 81376
295 <7월27일>Correlated topological phases in 3D complex oxides via Green's functions 2012.07.27 91655
294 <8/7> Scotch tape and spectroscopy: probing and manipulating the surface of a topological insulator 2012.07.27 87884
293 <9/7(금)> Kondo Effect in Chiral Orbital Bands 2012.08.31 74700
292 <9/7> On Dark Matter and its indirect detection with box-shaped gamma-rays 2012.09.05 70606
291 <9/14> High temperature superconductivity and fluctuating stripe 2012.09.10 69977
290 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 199099
289 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 95116
288 <10/5> Gauge fields. Past, present, future. 2012.10.05 70421
287 <10/12> Kondo Effect in a Quantum-Dot-Topological-Superconductor Junction: A Numerical Renormalization Group Analysis 2012.10.08 90056
286 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 84572
285 <11/22> Spin polarization of photoelectrons from a topological insulator 2012.10.22 70394
284 <10/24> Dung-hai Lee 교수와의 간담회 2012.10.23 70767
283 <11/5> Optical spectroscopic probe on the surface state in three dimensional topological insulators 2012.10.24 76094
282 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 101847
281 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 362826
280 <11/28> Extremal Black Holes and Holographic C-theorem 2012.11.28 98606
279 <12/21(금)> Generic quantum spin ice 2012.12.03 77658
» <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 112977
277 <12/12> lattice structure in holographic models 2012.12.12 81705