Transition of a prestine Mott insulator to a correlated Fermi liquid: Pressure-dependent optical investigations of a quantum spin liquid

Abstract

Systematic pressure- and temperature-dependent infrared studies on the two-dimensional organic quantum spin-liquid ${\beta }^{\prime }$-EtMe${}_3$Sb[Pd(dmit)${}_2$]${}_2$ disclose the electronic and lattice evolution across the Mott insulator-metal transition. Increasing hydrostatic pressure continuously suppresses the insulating ground state; for $p>0.6$~GPa, a Drude-like component develops indicating the appearance of coherent quasiparticles at the Fermi level. In the vicinity of the Mott transition, not only the electronic state changes rapidly, but also the vibration modes exhibit a jump both in frequency and Fano constant, underlining the strong coupling between lattice and electrons. The anisotropy of the in-plane optical response becomes inverted above 0.6~GPa. The findings are discussed in detail and summarized in a phase diagram comprising different experimental approaches.

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Cited by in corpus (5)

• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Low-Temperature Dielectric Anomalies at the Mott Insulator-Metal Transition
• The effect of local magnetic moments on spectral properties and resistivity near the interaction- and doping induced Mott transitions
• Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
• Charge imbalance in $\lambda$-(BETS)${}_2$GaCl${}_4$ and their interplay with superconductivity