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quant-ph2022
Derivation of a $\PT$-Symmetric Sine-Gordon Model from a Nonequilibrium Spin-Boson System via Keldysh Functional Integrals
Vinayak M. Kulkarni
We present a microscopic derivation from a nonequilibrium spin-boson model to a $\PT$-symmetric non-Hermitian sine-Gordon (SG) effective theory, via the Keldysh functional-integral…
cond-mat.str-el2022★ 2 cited
Emergent soft-gap Anderson models at quantum criticality in a lattice Hamiltonian within dynamical mean field theory
Sujan K. K., Vinayak M. Kulkarni, N. S. Vidhyadhiraja +1
Local quantum criticality in itinerant fermion systems has been extensively investigated through the soft-gap Anderson impurity model, wherein a localized, correlated impurity, hyb…
cond-mat.str-el2022★ 9 cited
Kondo effect in a non-Hermitian, -symmetric Anderson model with Rashba spin-orbit coupling
Vinayak M Kulkarni, Amit Gupta, N. S. Vidhyadhiraja
The non-interacting and non-Hermitian, parity-time ()-symmetric Anderson model exhibits an exceptional point (EP) at a non-Hermitian coupling , which remains unr…