Bender 1998: parity-time-symmetric Hamiltonians have real spectra below symmetry-breaking threshold; balanced gain-loss waveguide arrays demonstrate PT-phase transition (Ruter 2010, Guo 2009).
Bender 1998: parity-time-symmetric Hamiltonians have real spectra below symmetry-breaking threshold; balanced gain-loss waveguide arrays demonstrate PT-phase transition (Ruter 2010, Guo 2009).