Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.056402
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [DR228/39-1, DR228/51-1]
- Russian Ministry of Education and Science (Program 5 top 100)
- MIPT
- Japan Society for the Promotion of Science [16H06346]
- NSF [DMR-1410132]
- National High Magnetic Field Laboratory through the NSF Cooperative Agreement [DMR-1157490]
- State of Florida
- Division Of Materials Research [1410132] Funding Source: National Science Foundation
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The electrodynamic response of organic spin liquids with highly frustrated triangular lattices has been measured in a wide energy range. While the overall optical spectra of these Mott insulators are governed by transitions between the Hubbard bands, distinct in-gap excitations can be identified at low temperatures and frequencies, which we attribute to the quantum-spin-liquid state. For the strongly correlated ss'-EtMe3Sb[Pd(dmit)(2)](2), we discover enhanced conductivity below 175 cm(-1), comparable to the energy of the magnetic coupling J approximate to 250 K. For omega -> 0, these low-frequency excitations vanish faster than the charge-carrier response subject to Mott-Hubbard correlations, resulting in a dome-shaped band peaked at 100 cm(-1). Possible relations to spinons, magnons, and disorder are discussed.
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