Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.127401
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Funding
- US Department of Energy (DOE), Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering [DE-FG02-08ER46521, DE-SC0006423, DE-FG02-07ER46134]
- U.S. Department of Energy (DOE) [DE-SC0006423] Funding Source: U.S. Department of Energy (DOE)
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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 sigma(ab)(omega) from the spin degree of freedom. This spin-induced conductivity exhibits a power-law dependence on frequency sigma(ab)(omega) similar to omega(beta) with beta approximate to 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.
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