Abstract

The delocalization transition in the Anderson model in the presence of an imaginary gauge field is a landmark example of non-Hermitian topological phase transition. Originally proposed by Hatano and Nelson, its topological nature has been disclosed only very recently. Here it shown that a non-Hermitian phase transition can be observed in the frequency domain of an actively mode-locked laser in a parity-time ($\mathcal{PT}$)-symmetric configuration with incommensurate spacing of cavity axial frequencies.

© 2019 Optical Society of America

Inhibition of non-Hermitian topological phase transitions in sliding photonic quasicrystals

Stefano Longhi
Opt. Lett. 48(23) 6251-6254 (2023)

PT-symmetric mode-locking

S. Longhi
Opt. Lett. 41(19) 4518-4521 (2016)

Non-Hermitian topological phase transitions in superlattices and the optical Dirac equation

Stefano Longhi
Opt. Lett. 46(18) 4470-4473 (2021)

Robust Anderson transition in non-Hermitian photonic quasicrystals

Stefano Longhi
Opt. Lett. 49(5) 1373-1376 (2024)

Non-Hermitian laser arrays with tunable phase locking

Stefano Longhi
Opt. Lett. 47(8) 2040-2043 (2022)