Universal routes to spontaneous PT-symmetry breaking in non-hermitian quantum systems

Details Universal routes to spontaneous PT-symmetry breaking in non-hermitian quantum systems Universal routes to spontaneous PT-symmetry breaking in non-hermitian quantum systems

2010-11-05

arxiv.org/abs/1011.1385v1

Phys. Rev. A 83, 030101(R) (2011)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevA.83.030101

PT-symmetric systems can have a real spectrum even when their Hamiltonian is non-hermitian, but develop a complex spectrum when the degree of non-hermiticity increases. Here we utilize random-matrix theory to show that this spontaneous PT-symmetry breaking can occur via two distinct mechanisms, whose predominance is associated to different universality classes. Present optical experiments fall into the orthogonal class, where symmetry-induced level crossings render the characteristic absorption rate independent of the coupling strength between the symmetry-related parts of the system.

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