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in-plane H

in-plane H. Probing spinon Fermi surface with electron spin resonance Oleg A. Starykh , University of Utah, DMR 0808842. FS deformation by the external static field H 0.

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in-plane H

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  1. in-plane H Probing spinon Fermi surface with electron spin resonanceOleg A. Starykh, University of Utah, DMR 0808842 FS deformation by the external static field H0 Electron spin resonance (ESR) measures absorption of radiation (due to oscillating magnetic field h1eiwt) in the presence of static magnetic field H0. We showed that Dzyaloshinskii-Moriya (DM) interaction DijSixSj, which originates from atomic spin-orbit coupling, can turn rather standard electron spin resonance (ESR) experiment into a novel probe of exotic spin-liquid state in which fractionalized spinon excitations behave as neutral fermions and form two-dimensional Fermi surface. The resulting absorption spectrum is proportional to that in the system of usual (charged) electrons subject to Rashba-like spin-orbit interaction and in-plane external magnetic field. Absorption power is strongly sensitive to the polarization of the microwave radiation h1, diverging in an inverse square-root fashion when oscillating magnetic field is orthogonal to the static one H0. Ref: Rachel Glenn, Oleg A. Starykh, and Mikhail Raikh, Phys. Rev. B 86, 024423 (2012). in-plane H ωmin ωmax spin-orbit split Fermi surface (FS) of spinons μ μ vertical transitions from different segments of FS Absorption spectrum

  2. Probing spinon Fermi surface with electron spin resonanceOleg A. Starykh, University of Utah, DMR 0808842 Spin-orbit interaction is also crucial for nucleating Majorana fermions at the end of topological superconducting wire. • Broader impact: • The grant supported graduate student Rachel Glenn • (pictured on the left), who successfully defended her Ph.D. thesis in May of 2012. • As a part of outreach to undergraduate students at the University of Utah, the PI has given lecture “A spin on ice” in which he describes fascinating connections between crystal structure of water ice (H2O) and magnetic properties of pyrochlores with predominantly Ising interactions between spins (spin ice). • Main research topics supported by the grant are reviewed in web-based notes at the PI’s web page, see • http://www.physics.utah.edu/~starykh/research/research.html

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