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11 papers · 1 filter
Emerging topological characterization in non-equilibrium states of quenched Kitaev chains
Y. B. Shi, X. Z. Zhang, Z. Song
Topological characteristics of quantum systems are typically determined by the closing of a gap, while the dynamical quantum phase transition (DQPT) during quantum real-time evolut…
Steady off-diagonal long-range order state in a half-filled dimerized Hubbard chain induced by a resonant pulsed field
X. Z. Zhang, Z. Song
We show that a resonant pulsed field can induce a steady superconducting state even in the deep Mott insulating phase of the dimerized Hubbard model. The superconductivity found he…
Insulating-to-conducting state transition in the bilayer Hubbard model induced by a perpendicular quench field
X. Z. Zhang, Z. Song
A many-body quantum system with varying parameters can exhibit two distinct quantum states within the same energy shell. This allows for a dynamic transition from the ground state…
Field induced conducting state in Mott insulator
X. Z. Zhang, Z. Song
Electron--electron repulsion, on the one hand, can result in bound pair, which has heavy effective mass. On the other hand, it is also the cause of Mott insulator. We study the eff…
Probing the superfluid-insulator phase transition by a non-Hermitian external field
X. Z. Zhang, Z. Song
We study the response of a thermal state of the Hubbard-like system to either global or local non-Hermitian perturbation, which coalesces the degenerate ground state within the $U(…
Flat band and -pairing states in one-dimensional Moiré Hubbard model
R. Wang, Z. Song
A moiré system is formed when two periodic structures have a slightly mismatched period, resulting in unusual strongly correlated states in the presence of particle-particle intera…