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 1079647
607 <5/16(Thu.) 14:00 ~ >The Chiral anomaly without Landau levels 2019.05.08 129216
606 2019학년도 1학기 콜로퀴움 일정 2019.01.08 128749
605 <5/29> Nanomaterials Work at NASA-Johnson Space Center 2009.05.25 128469
604 <3/12(화)>물리학과 특별초청강연 개최 안내 2013.03.04 128076
603 <12/3> Characteristic of risk asset in financial market. 2010.11.29 128026
602 <10/17> Graphitic Carbon Nanostructures 2008.10.27 127506
601 <4/21> Experimental and Observational Astrophysics in the Infrared Wavebands 2009.04.17 127450
600 <11/5> Modified nucleic acid systems for biomedical applications 2010.11.01 127068
599 <5/1>In vivo optical imaging of hemodynamic changes 2009.05.06 126482
598 <April.17(Wed.)> Emerging Artificial Synapse for Learning- and Energy-Efficient Neuromorphic System 2019.04.11 126473
597 <10/28>Grazing Incidence X-ray Diffraction and Surface X-ray Scattering Study of Hematite (α-Fe2O3) Nano-cube 2011.10.26 126372
596 <3/19> Bioconjugates of nanomaterials for biochip & biosensor applications 2010.03.16 125925
595 <12/30> Dirac vs. Weyl in topological insulators: Adler-Bell-Jackiw anomaly in transport phenomena 2013.12.16 125381
594 <4/14> X-ray absorption fine structure analyses on amorphous oxide films 2009.04.06 125262
593 <4/30(화)> DC (DNA Curtains) and AC (Actin Curtains) in single-molecule biophysics 2013.04.11 123958
592 <4/30> Updates on warped brane inflation 2009.04.21 122568
» <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 121887
590 <1/28> Steps towards a non-relativistic AdS/CFT 2010.01.25 121869
589 <3/26> Fractional Hall Physics of Epitaxial Graphene: 2010.03.19 121634
588 <3/31> ZnO nanorod heterostructures and nanodevices 2006.03.27 121603