A degenerate trion liquid in atomic double layers
arxiv(2023)
摘要
Trions are a three-particle bound state of electrons and holes. Experimental
realization of a trion liquid in the degenerate quantum limit would open a wide
range of phenomena in quantum many-body physics. However, trions have been
observed only as optically excited states in doped semiconductors to date. Here
we report the emergence of a degenerate trion liquid in a Bose-Fermi mixture of
holes and excitons in Coulomb-coupled MoSe2/WSe2 monolayers. By electrically
tuning the hole density in WSe2 to be two times the electron density in MoSe2,
we generate equilibrium interlayer trions with binding energy about 1 meV at
temperatures two orders of magnitude below the Fermi temperature. We further
demonstrate a density-tuned phase transition to an electron-hole plasma,
spin-singlet correlations for the constituent holes and Zeeman-field-induced
dissociation of trions. The results pave the way for exploration of the
correlated phases of composite particles in solids.
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