没有双色晶格势的量子棘轮加速器
Quantum Ratchet Accelerator without a Bichromatic Lattice Potential
摘要：
在量子棘轮加速器系统中，可以在不使用偏置场的情况下动态地生成线性增加的定向电流。具有完全经典混沌的通用量子棘轮加速[Gong和Brumer，Phys.Rev.Lett. 97，240602（2006）]构成了量子混沌的一个新元素，也是对经典棘轮输运求和规则的一个有趣的违反。在这里，我们提出了一个简单的量子棘轮加速器模型，也可以产生线性增加的量子电流与完全经典混沌。这个新模型不需要双色晶格势。它是基于一个变种的共振踢转子系统，周期性地踢两个光晶格潜力相同的晶格常数，但具有不等的振幅和固定的相移之间。详细研究了棘轮电流加速率与系统参数的关系。我们的新量子棘轮加速器模型的冷原子版本应该可以通过对当前冷原子实验进行轻微修改来实现。
英文摘要：
In a quantum ratchet accelerator system, a linearly increasing directed current can be dynamically generated without using a biased field. Generic quantum ratchet acceleration with full classical chaos [Gong and Brumer, Phys. Rev. Lett. 97, 240602 (2006)] constitutes a new element of quantum chaos and an interesting violation of a sum rule of classical ratchet transport. Here we propose a simple quantum ratchet accelerator model that can also generate linearly increasing quantum current with full classical chaos. This new model does not require a bichromatic lattice potential. It is based on a variant of an on-resonance kicked-rotor system, periodically kicked by two optical lattice potentials of the same lattice constant, but with unequal amplitudes and a fixed phase shift between them. The dependence of the ratchet current acceleration rate on the system parameters is studied in detail. The cold-atom version of our new quantum ratchet accelerator model should be realizable by introducing slight modifications to current cold-atom experiments.
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。
