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Thermal Hall effects in Mott insulators and a non-Fermi liquid

日程 : 2020年8月27日(木) 10:30 am - 12:00 pm 場所 : https://sites.google.com/view/cevis2020/registration (We will send the zoom link to the registered participants) 講師 : Gang Chen 所属 : University of Hong Kong and Fudan Univeristy 世話人 : 押川正毅 (63275)
e-mail: oshikawa@issp.u-tokyo.ac.jp

Strongly correlated Mott insulators could harbor various magnetic excitations that are charge neutral and hidden from usual electrical transport measurement, while thermal transport is powerful to detect the elementary excitations therein. Besides the more conventional and well-understood magnon excitations in the ordered state, here we discuss thermal Hall effects of the appealing fractionalized excitations in the quantum disordered spin liquid phase, which reveal the intriguing couplings between emergent gauge fields and fractionalized spinon or “magnetic monopole”, and provide strong evidence to confirm spin liquids.

In the second part of the talk, we discuss a novel type of non-Fermi liquid (NFL) in itinerant magnets in 3D. Unlike the conventional hotspot and patch theory, the gapless fermions from the conduction electrons are coupled with infinitely many critical boson modes. We show that the magnetic moments fluctuate near a 2D boson surface in the momentum space at low energies when the system approaches an ordering transition. The infinite number of critical modes on the boson surface strongly scatter the conduction electrons on the Fermi surface and convert the metallic sector into a NFL. Various physical consequences of in this NFL are explored, including the thermodynamic, spectroscopic, transport properties.

Chair: Gil Young Cho

This event is jointly organized by the Korea Institute for Advanced Study and the University of Tokyo. “Correlated Electrons Virtual International Seminars (CEVIS)” https://sites.google.com/view/cevis2020/home


(公開日: 2020年08月21日)