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J. Carlos Egues 学术报告

信息来源: 发布日期: 2018-10-19 浏览次数:

报告题目:Topological and non-topological edge states in quantum dots and Chern Insulators

报告人:J. Carlos Egues Full Professor, University of Sao Paulo, Brazil

报告时间:20181019日(星期五)下午16:30

报告地点:物理楼313学术报告厅

报告摘要: Common wisdom has it that edge states appear only in topological systems, e.g., topological insulators and topological superconductors. In this talk I will discuss edge states in topological and non-topological InAsBi quantum dots described by a confined Bernevig-Hughes-Zhang model. Interestingly we find that these quantum dots exhibit protected helical edges states both in the topological and non-topological regimes [1]. I will also briefly discuss edge states in Chern insulators and nodal semimetals which display trivial edge states not arising from band topology (Chern number) [2]. In this case the approximate chiral symmetry of the Chern insulator (exact only in the nodal semimetal) is the relevant ingredient behind the appearance of these trivial edge states.

 

[1] D. R. Candido, M. E. Flatté and J. C. Egues, accepted in Phys. Rev. Lett., arXiv:1803.02936.

[2] D. R. Candido, M. Kharitonov, J. C. Egues, and E. Hankiewicz, Phys. Rev. B 98, 161111(R) (2018), (Editors’ Suggestion).