Matrix Hamiltonians with an algebraic guarantee of unbroken PT −symmetry


Although the quantum bound-state energies may be generated by the so called PT −symmetric Hamiltonians H = PH†P 6 = H where P is, typically, parity, the spectrum only remains real and observable (i.e., in the language of physics, the PT −symmetry remains unbroken) inside a domain D of couplings. We show that the boundary ∂D (i.e., certain stability and… (More)


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