Hoạt động
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Seminar
| Seminar Vật lý lý thuyết và Vật lý tính toán:
| | Tên báo cáo | Reflection symmetric second-order topological insulators and superconductors
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| Người trình bày | Dr. Luka Trifunovic
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| Cơ quan | Freie Universitaet, Berlin
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| Ngày | Thứ Sáu, 11-08-2017
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| Giờ | 09:30 AM
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| Địa điểm | Phòng 202 (Thư viện), Viện Vật lý, 10 Đào Tấn, Ba Đình, Hà Nội
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| Tóm tắt | Second-order topological insulators are crystalline insulators with a gapped bulk and gapped crystalline boundaries, but topologically protected gapless states at the intersection of two boundaries. Without further spatial symmetries, five of the ten Altland-Zirnbauer symmetry classes allow for the existence of such second-order topological insulators in two and three dimensions. We show that reflection symmetry can be employed to systematically generate examples of second-order topological insulators and superconductors, although the topologically protected states at corners (in two dimensions) or at crystal edges (in three dimensions) continue to exist if reflection symmetry is broken. A three-dimensional second-order topological insulator with broken time-reversal symmetry shows a Hall conductance quantized in units of e^2/h.
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| Người chủ trì | Nguyễn Thị Kim Thanh
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