Quantum phases of the biased two-chain-coupled Bose-Hubbard Ladder
- URL: http://arxiv.org/abs/2308.15042v1
- Date: Tue, 29 Aug 2023 05:52:02 GMT
- Title: Quantum phases of the biased two-chain-coupled Bose-Hubbard Ladder
- Authors: Jingtao Fan, Xiaofan Zhou, and Suotang Jia
- Abstract summary: We investigate the quantum phases of bosons in a two-chain-coupled ladder.
We find signatures of both insulating-to-superfluid and super-to-insulating quantum phase transitions.
We show that for infinite interaction bias, the model is amenable to some analytical treatments.
- Score: 0.6086160084025234
- License: http://creativecommons.org/publicdomain/zero/1.0/
- Abstract: We investigate the quantum phases of bosons in a two-chain-coupled ladder.
This bosonic ladder is generally in a biased configuration, meaning that the
two chains of the ladder can have dramatically different on-site interactions
and potential energies. Adopting the numerical density-matrix
renormalization-group method, we analyze the phase transitions in various
parameter spaces. We find signatures of both insulating-to-superfluid and
superfluid-to-insulating quantum phase transitions as the interchain tunnelling
is increased. Interestingly, tunning the interaction to some intermediate
values, the system can exhibit a reentrant quantum phase transition between
insulating and superfluid phases. We show that for infinite interaction bias,
the model is amenable to some analytical treatments, whose prediction about the
phase boundary is in great agreement with the numerical results. We finally
clarify some critical parameters which separate the system into regimes with
distinct phase behaviours, and briefly compare typical properties of the biased
and unbiased bosonic ladder systems. Our work enriches the Bose-Hubbard
physics.
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