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hatano-lab.iis.u-tokyo.ac.jp/seminar.html
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記
日時：２０１９年０５月２２日（水）１３時３０分〜 Wed, May 22, 1:30pm
場所：東京大学 生産技術研究所 千葉実験所 研究実験棟Ｉn210号室
道程：http://hatano-lab.iis.u-tokyo.ac.jp/access.html
講師：小澤知己さん（理研）Dr. Tomoki Ozawa (RIKEN)
演題：Quantum geometric tensor in ultracold gases and other synthetic quantum systems
要旨：
Topological and geometrical property of bands have attracted great attention during the past decade due to the development of the study of topological phases of matter in solid-state electron systems. Probably the most well-studied geometrical property of bands is the Berry curvature, integral of which gives rise to the topological Chern number. A less well known geometrical property is the quantum metric, or the Fubini-Study metric, which provides a metric structure in the Brillouin zone. Both Berry curvature and quantum metric are defined through momentum-space derivative of Bloch states, and are both gauge invariant. In fact, we can uniformly describe both concepts in terms of the quantum geometric tensor, real part of which is the quantum metric and imaginary part is the Berry curvature. In this talk, I explain intuitive meaning of the quantum metric, and discuss some physical consequences. I will also discuss recent experimental measurements of the quantum metric in ultr
acold atomic gases and diamond NV-centers, where the quantum metric was extracted through observation of excitation rates upon periodic modulation to the system.
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李 宰河
〒277-8574 千葉県柏市柏の葉5-1-5
東京大学生産技術研究所
e-mail: lee@iis.u-tokyo.ac.jp
Tel: 04-7136-6977
Fax: 04-7136-6978
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