Nonequilibrium quantum impurity problems via matrix-product states in the temporal domain
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DOI: 10.1103/physrevb.107.195101
Abstract: Describing a quantum impurity coupled to one or more non-interacting fermionic reservoirs is a paradigmatic problem in quantum many-body physics. While historically the focus has been on the equilibrium properties of the impurity-reservoir system, recent… read more here.
Keywords: time; quantum impurity; impurity; matrix product ... See more keywords
Efficient method for quantum impurity problems out of equilibrium
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DOI: 10.1103/physrevb.107.l201115
Abstract: We introduce an efficient method to simulate dynamics of an interacting quantum impurity coupled to non-interacting fermionic reservoirs. Viewing the impurity as an open quantum system, we describe the reservoirs by their Feynman-Vernon influence functionals… read more here.
Keywords: quantum impurity; impurity problems; quantum; impurity ... See more keywords
Exactly Solvable Quantum Impurity Model with Inverse-Square Interactions.
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DOI: 10.1103/physrevlett.123.066406
Abstract: We construct an exactly solvable quantum impurity model which consists of spin-1/2 conduction fermions and a spin-1/2 magnetic moment. The ground state is a Gutzwiller projected Fermi sea with nonorthonormal modes and its wave function… read more here.
Keywords: quantum impurity; solvable quantum; inverse square; exactly solvable ... See more keywords
Multiorbital Quantum Impurity Solver for General Interactions and Hybridizations.
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DOI: 10.1103/physrevlett.124.206405
Abstract: We present a numerically exact inchworm Monte Carlo method for equilibrium multiorbital quantum impurity problems with general interactions and hybridizations. We show that the method, originally developed to overcome the dynamical sign problem in certain real-time… read more here.
Keywords: general interactions; multiorbital quantum; sign problem; quantum impurity ... See more keywords