arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.01299cond-mat.str-el
收藏

双层Hubbard模型中由垂直淬火场诱导的绝缘态-导电态转变

Insulating-to-conducting state transition in the bilayer Hubbard model induced by a perpendicular quench field

X. Z. Zhang, Z. Song

AI总结:

本文研究了双层半满Hubbard模型在垂直电场下的动态响应,发现当电场与在位排斥共振时,系统从Mott绝缘态转变为导电态,两层因长寿命掺杂形成相同导电行为,此转变源于在位相互作用与共振场的协同作用,为强关联系统场致导电提供了新机制。

摘要:

具有变化参数的多体量子系统可以在同一能量壳层内表现出两种不同的量子态。这使得系统可以从淬火前哈密顿量的基态动态转变为淬火后哈密顿量的稳态。我们研究了双层半满Hubbard模型的基态对垂直电场的动态响应。我们证明,当电场与在位排斥共振时,稳态表现出导电性,而初始态为Mott绝缘态。此外,由于长寿命掺杂的形成,两层表现出相同的导电行为,电荷涨落证实了这一点。实现这种动态转变的关键因素是在位相互作用与共振场之间的协同作用,而非它们各自单独发挥的作用。我们的发现为强关联系统中的场致导电性提供了一种替代机制。

英文摘要:

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 of the pre-quench Hamiltonian to a steady state of the post-quench Hamiltonian. We investigate the dynamic response of the ground states in a two-layer half-filled Hubbard model to a perpendicular electric field. We demonstrate that the steady state exhibits conductivity when the field is in resonance with the on-site repulsion, while the initial state is a Mott-insulating state. Additionally, the two layers exhibit identical conducting behavior due to the formation of long-lived dopings, as evidenced by the charge fluctuation. The key factor in achieving this dynamic transition is the cooperative interplay between on-site interactions and the resonant field, rather than the individual roles they play. Our findings offer an alternative mechanism for field-induced conductivity in strongly correlated systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑