标题： 量子隧穿与反隧穿穿越熵障 显示英文标题

标题： Quantum tunneling and anti-tunneling across entropic barriers

摘要： 我们研究了量子粒子在一个二维收缩通道中的动力学，并分析了量子修正的出现如何影响(半)经典高温行为，随着温度降低而变化。我们表征了系统的平衡和非平衡（输运）性质，考虑了窄且无序的通道情况。出乎意料的是，我们发现量子修正并不会单调地增强粒子电流，正如从相干隧穿激活的角度所期望的那样，而是会在中间温度下抑制传输，增加有效的自由能势垒。我们通过计算描述系统的量子主方程的非平衡稳态来数值说明这一“反隧穿”效应，并采用量子斯莫卢霍夫斯基极限来解析确认它。 显示英文摘要

摘要： We study the dynamics of a quantum particle in a constricted two-dimensional channel and analyze how the onset of quantum corrections impacts the (semi-)classical high-temperature behaviour, as temperature is lowered. We characterize both equilibrium and non-equilibrium (transport) properties of the system, considering the case of a narrow and disorder-free channel. Counterintuitively, we find that quantum corrections do not monotonically enhance the particle current as the temperature is lowered, as naively expected from the activation of coherent tunnelling, but they rather inhibit transport at intermediate temperatures, increasing the effective free-energy barrier. We illustrate this ``anti-tunnelling'' effect numerically by computing the non-equilibrium steady-state of a quantum master equation describing the system, and confirm it analytically by adopting the Quantum Smoluchowski limit.