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고체전자구조계산연구실에서 아주대학교 임준원 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.

온-오프 혼합으로 진행되는 세미나입니다.


Title: Flat bands and the geometry of Bloch wave function

Speaker: 임  준   원  교수님 (아주대학교)

Date/time: 2021. 5. 4 (Tue.) 16:30

○ 온라인 참여방법: 아래의 WebEx 링크 접속

○ Place: Natural Science 1,  Room No. 31214

Abstract: Since the discovery of the superconductivity in the twisted bilayer graphene, which hosts nearly flat bands at the magic angle, flat band
systems have been studied intensively recently. In the topological sense, flat bands are believed to be trivial because the corresponding Bloch
wavefunction is analytic in the Brillouin zone. However, in the point of view of other geometric notions, such as the quantum distance and the
cross-gap Berry connection, the flat bands can be considered non-trivial. We show that flat bands can exhibit anomalous Landau level structures
under the magnetic field, and they can be characterized by such geometric properties of the Bloch wave function.
[1] Phys. Rev. B 99 045107, Jun-Won Rhim and Bohm-Jung Yang (2019)
[2] Phys. Rev. Lett. 124 183901, Jina Ma, Jun-Won Rhim, et al (2020)
[3] Nature 584 59, Jun-Won Rhim, Kyoo Kim, and Bohm-Jung Yang (2020)
[4] arXiv:2012.15132, Yoonseok Hwang, Jun-Won Rhim, and Bohm-Jung Yang (2021)

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