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Spin-Induced Optical Conductivity in the Spin-Liquid Candidate Herbertsmithite

Author(s)
Han, Tianheng; Shrekenhamer, D.; Padilla, W. J.; Pilon, Daniel Victor; Lui, Chun Hung; Frenzel, Alex James; Lee, Young S.; Gedik, Nuh; ... Show more Show less
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Abstract
We report a direct measurement of the low-frequency optical conductivity of large-area single-crystal herbertsmithite, a promising spin-liquid candidate material, by means of terahertz time-domain spectroscopy. In the spectral range below 1.4 THz, we observe a contribution to the real part of the in-plane conductivity σ[subscript ab](ω) from the spin degree of freedom. This spin-induced conductivity exhibits a power-law dependence on frequency σ[subscript ab](ω) ~ ω[superscript β] with β ≈ 1.4. Our observation is consistent with the theoretically predicted low-frequency conductivity arising from an emergent gauge field of a gapless U(1) Dirac spin liquid.
Date issued
2013-09
URI
http://hdl.handle.net/1721.1/84975
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Pilon, D. V. et al. “Spin-Induced Optical Conductivity in the Spin-Liquid Candidate Herbertsmithite.” Physical Review Letters 111.12 (2013): n. pag. © 2013 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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