Pair density waves in the strong-coupling two-dimensional Holstein-Hubbard model: a variational Monte Carlo study
arxiv(2024)
摘要
A robust theory of the mechanism of pair density wave (PDW) superconductivity
(i.e. where Cooper pairs have nonzero center of mass momentum) remains elusive.
Here we explore the triangular lattice t-J-V model, a low-energy
effective theory derived from the strong-coupling limit of the Holstein-Hubbard
model, by large-scale variational Monte Carlo simulations. When the electron
density is sufficiently low, the favored ground state is an s-wave PDW,
consistent with results obtained from previous studies in this limit.
Additionally, a PDW ground state with nematic d-wave pairing emerges in
intermediate range of electron densities and phonon frequencies. For these
s-wave and d-wave PDWs arising in states with spontaneous breaking of
time-reversal and inversion symmetries, PDW formation derives from
valley-polarization and intra-pocket pairing.
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