Magazzù Luca, Valenti Davide, Spagnolo Bernardo, Grifoni Milena
Dipartimento di Fisica e Chimica, Università di Palermo, Viale delle Scienze, Edificio 18, I-90128 Palermo, Italy.
Radiophysics Department, Lobachevsky State University of Nizhni Novgorod, Russia.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Sep;92(3):032123. doi: 10.1103/PhysRevE.92.032123. Epub 2015 Sep 17.
The dissipative dynamics of a quantum bistable system coupled to a Ohmic heat bath is investigated beyond the spin-boson approximation. Within the path-integral approach to quantum dissipation, we propose an approximation scheme which exploits the separation of time scales between intra- and interwell (tunneling) dynamics. The resulting generalized master equation for the populations in a space localized basis enables us to investigate a wide range of temperatures and system-environment coupling strengths. A phase diagram in the coupling-temperature space is provided to give a comprehensive account of the different dynamical regimes.
研究了耦合到欧姆热库的量子双稳系统在超越自旋玻色子近似下的耗散动力学。在量子耗散的路径积分方法中，我们提出了一种近似方案，该方案利用了阱内和阱间（隧穿）动力学之间的时间尺度分离。由此得到的在空间局域基下关于布居数的广义主方程使我们能够研究广泛的温度范围和系统 - 环境耦合强度。给出了耦合 - 温度空间中的相图，以全面描述不同的动力学区域。
