Condensed Matter Seminar: "Spin waves in chiral two-dimensional electron systems"

Speaker Carsten Ullrich, University of Missouri
Date: 10/13/2017
Time: 1 p.m.

ESB 190


Physics - Condensed Matter

Event Type: Seminar/Symposium

In this talk I will discuss our recent theoretical and experimental results for spin-wave dispersions in n-doped semiconductor quantum wells subject to in-plane magnetic fields. Our particular focus is on the interplay between spin-orbit coupling and electronic many-body effects. Rashba and Dresselhaus spin-orbit coupling induces a wavevector-dependent spin splitting in the conduction bands. The spin waves hence travel through a spin-orbit twisted medium, which leads to interesting new ways of controlling the direction and group velocity of the spin waves. Due to the absence of spin-rotation invariance, Larmor's theorem is broken. For the special case of equal-strength Rashba and Dresselhaus spin-orbit coupling, a new exact many-body result is found, which we call the spin helix Larmor mode.

To request disability-related accommodations for this event, please contact the person listed above, or the unit hosting the event.

Event Mailing List

Receive Physics Illinois events weekly in your inbox.


Remove me!