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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Thermal-transport studies on two-dimensional quantum spin liquids.

Minoru Yamashita1, Takasada Shibauchi, Yuji Matsuda

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto, Japan. yamashitaminoru@scphys.kyoto-u.ac.jp

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|October 21, 2011
PubMed
Summary

Quantum spin liquids (QSLs) are exotic states of matter. Thermal transport measurements reveal distinct QSLs in two organic insulators, one with a spin gap and the other exhibiting gapless excitations and long-range coherence.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Quantum Spin Liquids

Background:

  • Quantum spin liquids (QSLs) are states where quantum fluctuations prevent long-range magnetic order.
  • Identifying and characterizing QSL ground states and their exotic phenomena remain significant challenges in condensed matter physics.

Purpose of the Study:

  • To investigate the nature of elementary excitations in two novel organic quantum spin liquid candidates.
  • To differentiate between distinct QSL states using thermal transport measurements.

Main Methods:

  • Thermal-transport measurements were performed on κ-(BEDT-TTF)2Cu2(CN)3 and EtMe3Sb[Pd(dmit)2]2.
  • Analysis focused on heat transport behavior at low temperatures and its dependence on temperature.

Main Results:

  • κ-(BEDT-TTF)2Cu2(CN)3 exhibits thermally activated heat transport, indicative of a spin gap.
  • EtMe3Sb[Pd(dmit)2]2 displays a linear temperature dependence of thermal conductivity, signifying gapless excitations.
  • A remarkably long mean free path (approx. 1000 lattice distances) was observed in EtMe3Sb[Pd(dmit)2]2, suggesting long-distance coherence.

Conclusions:

  • The two organic insulators host distinct quantum spin liquid states with different elementary excitations.
  • The findings highlight the potential of quantum spin liquids as quantum-condensed states with emergent long-distance coherence.