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quant-ph2024
Arbitrary order transfer matrix exceptional points and van Hove singularities
Madhumita Saha, Bijay Kumar Agarwalla, Manas Kulkarni +1
In lattice models with quadratic finite-range Hermitian Hamiltonians, the inherently non-Hermitian transfer matrix (TM) governs the band dispersion. The van Hove singularities (VHS…
quant-ph2023★ 1 cited
Modified quantum regression theorem and consistency with Kubo-Martin-Schwinger condition
Sakil Khan, Bijay Kumar Agarwalla, Sachin Jain
We show that the long-time limit of the two-point correlation function obtained via the standard quantum regression theorem, a standard tool to compute correlation functions in ope…