University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Wednesday, December 7th 2016
2:30 pm:
Speaker: Saurabh Maiti, University of Florida
Subject: Chiral-spin modes in a 2D Fermi-Liquid with spin-orbit coupling

Chiral-spin modes in a 2D Fermi-Liquid with spin-orbit coupling(SOC) are oscillations of magnetization in zero magnetic field resulting from a many-body effect. To study them, we develop a scheme to incorporate many-body effects in SOC systems. As a result, we discover a number of interesting features associated with SOC (of Rashba and Dresselahaus type). Since collective modes usually dominate the response to any probe they couple to, it is necessary to correctly formulate a theory that can express these modes in terms of the material parameters. I will show how our scheme does precisely this and highlight some unique features introduced by SOC, namely, a linear-in-q dispersion of a massive collective mode in an externally applied in-plane magnetic field, and a characteristic anisotropy of the mass with rotation of the in-plane field. Our interpretation is consistent with several observed features in a series of Raman experiments in CdMnTe quantum well (which were earlier interpreted as an indication of a strong renormalization of SOC by electron-electron interaction). We also offer predictions for other observables with/without the externally applied field.

Faculty Host: Andrey Chubukov

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