Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA.
Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.
Phys Rev Lett. 2023 Jun 23;130(25):250404. doi: 10.1103/PhysRevLett.130.250404.
Above-barrier quantum scattering with truncated real potentials V(x)=-|x|^{p} provides an experimentally accessible platform that exhibits spontaneous parity-time symmetry breaking as p is varied. The unbroken phase has reflectionless states that correspond to bound states in the continuum of the nontruncated potentials at arbitrarily high discrete real energies. In the fully broken phase there are no bound states. There is a mixed phase in which exceptional points occur at specific energies and values of p. These effects should be observable in cold-atom scattering experiments.
使用截断实势 V(x)=-|x|^{p}进行势垒上量子散射提供了一个实验上可实现的平台，该平台在 p 变化时表现出自发的宇称-时间对称破缺。未破缺相具有无反射状态，这些状态对应于非截断势的连续谱中任意高离散实能的束缚态。在完全破缺相中没有束缚态。在混合相中，在特定的能量和 p 值处会出现异常点。这些效应应该可以在冷原子散射实验中观察到。
