https://doi.org/10.1140/epjp/s13360-020-00664-6
Regular Article
Role of PT-symmetry in understanding Hartman effect
1
Indian Space Research Organisation, 560094, Bangalore, India
2
Department of Physics, Banaras Hindu University, 221005, Varanasi, India
c bhabani.mandal@gmail.com, bhabani@bhu.ac.in
Received:
7
May
2020
Accepted:
1
August
2020
Published online:
10
August
2020
We calculate the tunneling time from a layered non-Hermitian system to examine the effect of PT-symmetry over tunneling time. We explicitly find that for system respecting PT-symmetry, the tunneling time saturates with the thickness of the PT-symmetric barrier and thus shows the existence of Hartman effect. For non-PT-symmetric case, the tunneling time depends upon the thickness of the barrier and Hartman effect is lost. We further consider the limiting case in which the non-Hermitian system reduces to the real barrier to show that the Hartman effect from a real barrier is due to PT-symmetry (of the corresponding non-Hermitian system).
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
