Optical superlattices with sublattice symmetry subjected to a synthetic imaginary gauge field undergo a topological phase transition in theBloch energy spectrum, characterized by the change of a spectral winding number. For a narrow gap, the phase transition is of universal form and described by a non-HermitianDirac equation with Lorentz-symmetry violation. A simple photonic system displaying such a phase transition is discussed, which is based on light coupling in co-propagating gratings.
Non-Hermitian topological phase transitions in superlattices and the optical Dirac equation
Longhi S.
2021-01-01
Abstract
Optical superlattices with sublattice symmetry subjected to a synthetic imaginary gauge field undergo a topological phase transition in theBloch energy spectrum, characterized by the change of a spectral winding number. For a narrow gap, the phase transition is of universal form and described by a non-HermitianDirac equation with Lorentz-symmetry violation. A simple photonic system displaying such a phase transition is discussed, which is based on light coupling in co-propagating gratings.File in questo prodotto:
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