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ResercherID: Y. Hatsugai
投稿者 : hatsugai 投稿日時： 2016-09-16 10:55:24 (172 ヒット)
Our paper on a photonic system in 3D which has the Weyl points due to breaking inversion is published in Phys. Rev. B as an edtors' suggestsion. See also highlights. The Weyl points are characterized as the topopoligical critial points of the sliced 2D system which has a non trivial Chern number (section Chern number) with jumps. Momentum selective edge states propagating near the boundaries are discussed as a typical example of the bulk-edge correspondence. Have a look at !
投稿者 : hatsugai 投稿日時： 2016-05-12 09:29:05 (658 ヒット)
We are organizing a workshop on the bulk-edge correspondence in relation to cold atoms and ARPES ( theories as well) as a YITP workshop ( Yukawa Institute of theoretical physics) in Kyoto Sep.27-30, 2016. Its registration will be open soon. Stay tuned. [YITP site] . [Direct link].
投稿者 : hatsugai 投稿日時： 2016-01-16 17:16:48 (329 ヒット)
Topological pump, proposal by Thouless and just recently realized experimeatally in Kyoto and Munich independently, is revisited from the bulk-edge correspondence (BEC). It's typically described by well known Harper equation as in QHE but the view point of BEC supplies quite different physical / mathematical structure. Pumped charge is carried by bulk but its quantization is guaranteed by the topological number defined by a singular motion of the center of mass caused by edge states. However this singular motion can not be observed in reality by a pumping of finite speed.The edge states are hidden! Counting the topological number by singularities of the spectral flow is a standard technique in the discussion of the Atiyah-Patodii-Singer index theorem. The same counting appears in the BEC in the pumping. It's a unexpected surprise. Have a look at arXiv:1601.03537, Phys. Rev. B94, 041102(R) (2016)