Linked $\mathcal{PT }$-symmetry to Supersymmetry in a class of non-Hermitian Hamiltonians

TL;DR

This paper explores a class of non-Hermitian Hamiltonians with velocity-dependent potentials, demonstrating their spectral stability, supersymmetric relationships, and the nuanced interplay between PT-symmetry and supersymmetry, including cases of SUSY breaking.

Contribution

It introduces a new class of non-Hermitian Hamiltonians with velocity-dependent potentials and analyzes their supersymmetric structure and PT-symmetry properties, revealing novel SUSY breaking scenarios.

Findings

Spectra are real and bounded from below, indicating stability.

Non-PT-symmetric Hamiltonians can be transformed into superpartners, showing spectrum preservation.

SUSY can be broken in non-PT-symmetric non-Hermitian Hamiltonians, a new insight.

Abstract

We introduce and study a class of non-Hermitian Hamiltonians which have velocity dependent potentials. Since stability can not be advocated directly from the classical potential, we show that the energy spectra are real and bounded from below which proves the stability of the spectra of all members in the class. We find that the introduced class of non-Hermitian Hamiltonians do have a corresponding superpartner class of non-Hermitian Hamiltonians. We were able to introduce supercharges which in conjunction with the corresponding super Hamiltonians constitute a closed super algebra. Among the introduced Hamiltonians, we show that non-$\mathcal{PT }$-symmetric Hamiltonians can be transformed into their corresponding superpartner Hamiltonians via a specific canonical transformation while the $\mathcal{PT }$-symmetric ones failed to be mapped to their corresponding superpartner Hamiltonians via the same canonical transformation. Since canonical transformations preserve the spectrum, we conclude that non-$\mathcal{PT }$-symmetric Hamiltonians out of the introduced class of Hamiltonians have the same spectrum as the corresponding superpartner Hamiltonians and thus Susy is broken for such Hamiltonians. This kind of intertwining of $\mathcal{PT }$-symmetry and Supersymmetry is new as all the so far discussed cases concentrate on Hamiltonians of broken $\mathcal{PT }% $-symmetry that have broken Supersymmetry too while we showed that Susy can be also broken for non-$\mathcal{PT }$-symmetric and non-Hermitian Hamiltonians .