Volume 125, Number 3, February 2019
|Number of page(s)||6|
|Published online||26 February 2019|
Can a photonic thermalization gap arise in disordered non-Hermitian Hamiltonian systems?
1 School of Electrical, Computer and Energy Engineering, Arizona State University - Tempe, AZ 85287, USA
2 Department of Physics, Arizona State University - Tempe, AZ 85287, USA
Received: 7 December 2018
Accepted: 28 January 2019
The phenomenon of a chiral-symmetry protected thermalization gap in Hermitian photonic systems is counterintuitive as it implies that the photon coherence can be continuously improved by disorders towards an asymptotic limit. We show that the phenomenon disappears in time-independent, non-Hermitian photonic systems even when the chiral symmetry is well preserved. In fact, the degree of thermalization generally increases with the disorder strength, in agreement with intuition. As non-Hermitian characteristics (e.g., weak gain and loss) can be expected in realistic physical situations, the phenomenon of a thermalization gap may be observed but only in well-controlled experiments with high-quality materials.
PACS: 05.45.-a – Nonlinear dynamics and chaos / 05.45.Mt – Quantum chaos; semiclassical methods / 42.82.Et – Waveguides, couplers, and arrays
© EPLA, 2019
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