Tunneling time in PT -symmetric systems

Abstract

In the present work, we propose a generalization of tunneling time in parity and time $(\mathcal{P}\mathcal{T})$-symmetric systems. The properties of tunneling time in $\mathcal{P}\mathcal{T}$-symmetric systems are studied with a simple contact interaction periodic finite-size diatomic $\mathcal{P}\mathcal{T}$-symmetric model. The physical meaning of negative tunneling time in $\mathcal{P}\mathcal{T}$-symmetric systems and its relation to spectral singularities is discussed.