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arXiv 1909.09549cond-mat.stat-mechcond-mat.mes-hallquant-ph
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非平衡量子网络中的磁场诱导对称性破缺

Magnetic field induced symmetry breaking in nonequilibrium quantum networks

Juzar Thingna, Daniel Manzano, Jianshu Cao

摘要:

我们研究了外加磁场对一般立方量子网络非平衡输运性质的影响,该网络由紧束缚哈密顿量描述,并与保持开放系统对称性的引线进行了专门设计的耦合。我们证明了开放系统的对称性可以通过磁场的方向来操纵。从没有场时保持的所有对称性开始,各向异性场和各向同性场系统地打破了对称性,影响了所有的非平衡性质。对于简单的立方系统,我们能够识别的稳态,包括纯态,浴依赖态(非平衡稳态),也非物理状态。作为应用,我们对大型立方体网络进行了数值计算,表明对称性破缺可以控制非平衡电流,并且不同的环境相互作用可以导致可以在人工超晶格和冷原子中设计的新特征。

英文摘要:

We study the effect of an applied magnetic field on the nonequilibrium transport properties of a general cubic quantum network described by a tight-binding Hamiltonian with specially designed couplings to the leads that preserve open-system symmetries. We demonstrate that the symmetry of open systems can be manipulated by the direction of the magnetic field. Starting with all the symmetries preserved in absence of a field, the anisotropic and isotropic fields systematically break the symmetries, influencing all nonequilibrium properties. For simple cubic systems, we are able to identify the steady states that comprise of pure states, bath-dependent states (nonequilibrium steady states), and also nonphysical states. As an application, we show numerically for large cubic networks that the symmetry breaking can control nonequilibrium currents and that different environmental interactions can lead to novel features which can be engineered in artificial super-lattices and cold atoms.

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。

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