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 1089328
280 <June 10(Thu.)>Oxide electronics utilizing spin-orbit coupling 2021.05.31 167225
279 <9/15> Resistance Switching Behavior of Epitaxially Grown NiO Thin Films 2009.09.07 165239
278 <6/25(화)>물리학과 특별세미나 개최 안내 2013.06.24 164102
277 <12/26> Emergent Physics in 3D Correlated Topological Semimetals file 2013.12.20 156991
276 <11/11>Leptogenesis in triplet seesaw models 2006.11.08 152872
275 <Oct. 20(Tue.) 2:00 PM> High-throughput Synthesis of Oxide Thin Films 2015.10.05 150082
274 <11/22>A Glimpse of X-ray Sky 2006.11.16 143840
» <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 143630
272 <7/25(목) 오전11시> 물리학과 특별세미나 개최 안내 2013.07.19 142266
271 <5/16(Thu.) 14:00 ~ >The Chiral anomaly without Landau levels 2019.05.08 139176
270 <12/30> Dirac vs. Weyl in topological insulators: Adler-Bell-Jackiw anomaly in transport phenomena 2013.12.16 135540
269 <3/12(화)>물리학과 특별초청강연 개최 안내 2013.03.04 135027
268 <Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion 2015.11.04 134652
267 <5/3> High-Speed MOSFET Technology: State-of-the-Art Strain Engineering 2006.05.02 134516
266 <4/21> Experimental and Observational Astrophysics in the Infrared Wavebands 2009.04.17 132350
265 <4/14> X-ray absorption fine structure analyses on amorphous oxide films 2009.04.06 130783
264 <10/28>Grazing Incidence X-ray Diffraction and Surface X-ray Scattering Study of Hematite (α-Fe2O3) Nano-cube 2011.10.26 129718
263 <7/21(월)> The rapid neutron capture nucleosynthesis: A hot topic in the Nuclear Astrophysics study 2014.07.15 129713
262 <4/30(화)> DC (DNA Curtains) and AC (Actin Curtains) in single-molecule biophysics 2013.04.11 128346
261 <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 127957