Thermodynamic behavior of correlated electron-hole fluids in van der Waals heterostructures.

ABSTRACT: Coupled two-dimensional electron-hole bilayers provide a unique platform to study strongly correlated Bose-Fermi mixtures in condensed matter. Electrons and holes in spatially separated layers can bind to form interlayer excitons, composite Bosons expected to support high-temperature exciton condensates. The interlayer excitons can also interact strongly with excess charge carriers when electron and hole densities are unequal. Here, we use optical spectroscopy to quantitatively probe the local thermodynamic properties of strongly correlated electron-hole fluids in MoSe₂/hBN/WSe₂ heterostructures. We observe a discontinuity in the electron and hole chemical potentials at matched electron and hole densities, a definitive signature of an excitonic insulator ground state.

SUBMITTER: Qi R 

PROVIDER: S-EPMC10719388 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature