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山西快三送彩金38元—官方网址22270.COM_鐗╃悊绯诲緪鍒氬鏈姤鍛婄殑閫氱煡锛圥hysics Department Colloquium锛

缂栬緫锛氭睙涓 鏉ユ簮锛氱墿鐞嗗绯 鏃堕棿锛2019骞11鏈05鏃 璁块棶娆℃暟:0  婧愬湴鍧

棰樼洰锛Some exotic topological states in Magnetic groups

鎶ュ憡浜猴細寰愬垰 鍗庝腑绉戞妧澶у鍥藉鑴夊啿寮虹鍦虹瀛︿腑蹇

鍦扮偣锛 鏁欏崄浜鈥201

鏃堕棿锛 118鏃ワ紝鍛ㄤ簲锛15:30-16:30

 

Abstract

In Magnetic groups (MGs), the time reversal symmetry is broken, but its combinations with some crystalline symmetries, named as crystalline time reversal symmetry (CTRS), are preserved, and can protect the novel topological phase against the local perturbations without destroy the magnetic symmetries. In this talk, I will introduce two works on the exotic topological quantum states in magnetic groups. 1. Antiferromagnetic (AFM) Dirac semimetals (DSMs) realized in the interlayer AFM EuCd2As2. In this work, we generalize the concept of DSM to the magnetic space groups (MSGs), and define a new category of DSM in type IV MGs. Many exotic topological states, such as the triple point semimetal and the AFM topological insulator holding of the half-quantum Hall effect can be derived from such AFM DSMs by breaking certain symmetry, providing an ideal platform to study topological phase transitions. 2. New type of topological superconductor (TSC) phase in the 1-dimensional (1D) MGs. We find that the CTRS could enrich the classification of TSC. In the 1D system generated by  or  symmetry, such CTRS could lead to the BDI class of TSC with  topological invariant, rather than the conventional D- or DIII-class (Z2 invariant). More interestingly, the TSC phase in the MGs generated by  and  are totally beyond the Altland and Zirnbauer symmetry classes, but belong to a new type of  ( for  system) classification, in which the robust Majorana zero modes are protected by the unitary chiral symmetry. The minimal tight binding BdG Hamiltonians satisfying  or  MGs are also constructed to illustrate the novel TSC phase.

 

涓汉绠浠

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娆㈣繋鑰佸笀鍜屽悓瀛﹀弬鍔狅紒


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