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 1090429
158 <3/12(화)>물리학과 특별초청강연 개최 안내 2013.03.04 135540
157 <2/7>Emergent p-wave Kondo Coupling in Multi-Orbital Bands with Mirror Symmetry Breaking 2013.02.06 75039
156 <2/7> Exotic phases in pyrochlore iridates 2013.02.05 66773
155 <1/16> Higgs-to-diphoton rate in type II seesaw models 2013.01.11 77031
154 <12/12> lattice structure in holographic models 2012.12.12 77541
» <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 144234
152 <12/21(금)> Generic quantum spin ice 2012.12.03 68240
151 <11/28> Extremal Black Holes and Holographic C-theorem 2012.11.28 108109
150 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 103677
149 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 205448
148 <11/5> Optical spectroscopic probe on the surface state in three dimensional topological insulators 2012.10.24 70655
147 <10/24> Dung-hai Lee 교수와의 간담회 2012.10.23 68732
146 <11/22> Spin polarization of photoelectrons from a topological insulator 2012.10.22 64016
145 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 77972
144 <10/12> Kondo Effect in a Quantum-Dot-Topological-Superconductor Junction: A Numerical Renormalization Group Analysis 2012.10.08 80468
143 <10/5> Gauge fields. Past, present, future. 2012.10.05 66230
142 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 90739
141 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 83370
140 <9/14> High temperature superconductivity and fluctuating stripe 2012.09.10 105406
139 <9/7> On Dark Matter and its indirect detection with box-shaped gamma-rays 2012.09.05 76065