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 2022학년도 1학기 콜로퀴움 일정 2022.01.10 27217
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 969970
120 <11/26(수)> Neutrino Physics with KamLAND 2014.11.20 88190
119 <5/14> Synthesis of Two Dimensional Materials by Chemical vapor deposition 2014.05.07 88315
118 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 88609
117 <1/26> Hamiltonian formalism 2011.01.19 88645
116 <6/5>Magnetism and Superconductivity 2009.05.27 88676
115 <11/6> Graphene plasmon and Plasmonics 2013.10.31 88902
114 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 89059
113 <10/10> Spin transistor : Detection and manipulation of spin transport in semiconductor 2012.09.27 89077
112 <4/28> Generalised cosmological scaling solutions in braneworld and their duality properties 2006.04.24 89216
111 <Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion 2015.11.04 89899
110 <11/19> From Schrödinger's cat to quantum technology using light 2010.11.11 90126
109 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 90349
108 <1/24> Basics of Gravitational Perturbatiosn 2011.01.19 90678
107 <10/15> An Ideal Mean-Field Transition in a Driven Interacting System 2009.09.30 90732
106 <4/22> How Many is Different? Ideal Bose gas revisited 2011.04.22 90739
» <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 90840
104 <Nov. 18(Wed.) 4:30 PM> Single-molecule chemistry and spectroscopy on ultrathin insulating films 2015.11.11 91049
103 <5/28> The hunt for high energy neutrinos with IceCube - more evidence for their astrophysical origin 2014.05.22 91244
102 <8/17> AdS Black Hole Solutions in Extended New Massive Gravity 2010.08.16 91271
101 <11/22>A Glimpse of X-ray Sky 2006.11.16 91277