Spin-induced optical conductivity in the spin-liquid candidate herbertsmithite.

Journal Article

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(ab)(ω) from the spin degree of freedom. This spin-induced conductivity exhibits a power-law dependence on frequency σ(ab)(ω) ~ ω(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.

Full Text

Duke Authors

Cited Authors

  • Pilon, DV; Lui, CH; Han, T-H; Shrekenhamer, D; Frenzel, AJ; Padilla, WJ; Lee, YS; Gedik, N

Published Date

  • September 18, 2013

Published In

Volume / Issue

  • 111 / 12

Start / End Page

  • 127401 -

PubMed ID

  • 24093299

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.111.127401

Language

  • eng