Session Q8: Focus Session: Spin Liquids II
11:15 AM–2:15 PM, Wednesday, February 29, 2012
Room: 208
Sponsoring Units:
DMP GMAG
Chair: Arthur Ramirez, UC Santa Cruz
Abstract ID: BAPS.2012.MAR.Q8.11
Abstract: Q8.00011 : ESR lineshape for a two-dimensional spin liquid state with spinon Fermi surface
1:15 PM–1:27 PM
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Abstract 
Authors:
Oleg Starykh
(University of Utah)
Rachel Glenn
(University of Utah)
Mikhail Raikh
(University of Utah)
We propose that ESR experiment can be an informative probe of a putative spin-liquid ground state with a spinon Fermi surface. Our proposal is based on the assumption that in addition to strong and frustrated Heisenberg exchange interactions, the spins also interact via an asymmetric Dzyaloshinskii-Moriya interaction (DMI). We argue that in a spin-liquid state the DMI plays the role of a spin-orbit interaction well-known in low-dimensional conductors. Assuming further spin-orbit interaction to be of Rashba type, we calculate the ESR absorption spectrum of a two-dimensional fermion gas subject to Zeeman and spin-orbit fields. Finite spin-orbit coupling translates into a finite absorption spectrum width. Remarkably, the ESR signal diverges as an inverse square-root at the edges of the spectrum.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.Q8.11