Coexistence of directed momentum current and ballistic energy diffusion in coupled non-Hermitian kicked rotors

Jian-Zheng Li, Wen-Lei Zhao, Jie Liu

We numerically investigate the quantum transport in a coupled kicked rotors with the $\mathcal{P}\mathcal{T}$-symmetric potential. We find that the spontaneous $\mathcal{P}\mathcal{T}$-symmetry breaki…