Spin-charge-entangled non-Fermi liquid in a candidate material for a doped spin liquid

Abstract

Quantum spin liquids are exotic Mott insulators that carry extraordinary spin excitations and thus, when doped, expected to afford novel metallic states coupled to the unconventional magnetic excitations. The organic triangular-lattice system k-(ET)4Hg2.89Br8 is a promising candidate for the doped spin-liquid and hosts a non-Fermi liquid at low pressures. We show that, in the non-Fermi liquid regime, the charge transport confined in the layer gets deconfined sharply at low temperatures, coinciding with the entrance of spins into a quantum regime as signified by a steep decrease in spin susceptibility behaving like the triangular-lattice Heisenberg model indicative of spin-charge separation at high temperatures. This suggests a new type of non-Fermi liquid, where interlayer charge-deconfimement is associated with spin-charge entanglement.

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• Quantum Spin Liquids
• Quantum Spin Liquid States
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• Frustration and the Kondo effect in heavy fermion materials
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Cited by in corpus (15)

• When Superconductivity Crosses Over: From BCS to BEC
• Superconductivity in the doped quantum spin liquid on the triangular lattice
• Mott-driven BEC-BCS crossover in a doped spin liquid candidate, kappa-(BEDT-TTF)4Hg2.89Br8
• Extraordinary $\pi$-Electron Superconductivity Emerging from a Quantum Spin Liquid
• Mechanism of superconductivity and electron-hole doping asymmetry in $\kappa$-type molecular conductors
• ${\mathbb{Z}}_2$ metallic spin liquid on a frustrated Kondo lattice
• Thermoelectric signature of quantum critical phase in a doped spin liquid candidate
• Superconductivity in doped triangular Mott insulators: the roles of parent spin backgrounds and charge kinetic energy
• Pseudogap formation in organic superconductors
• Topological superconductivity from doping a triplet quantum spin liquid in a flat band system
• Doping the Mott insulating state of the triangular-lattice Hubbard model reveals the Sordi transition
• Test for BCS-BEC Crossover in the Cuprate Superconductors
• Two $T$-linear scattering rate regimes in the triangular lattice Hubbard model
• Possibility of BCS-BEC crossover in $\kappa$-type organic superconductors
• Photoinduced Frustration Modulation in $\kappa$-type Quantum Spin Liquid Candidates