Results 71 to 80 of about 132,022 (206)
Two‐Time Quantum Fluctuations Approach and Its Relation to the Bethe–Salpeter Equation
physica status solidi (b), Volume 261, Issue 9, September 2024.The Bethe–Salpeter equation is combined with the generalized Kadanoff–Baym ansatz to derive a two‐time version of the GW approximation. This approximation is compared to the polarization approximation to show the relation between the two‐time fluctuations approach and the Bethe–Salpeter equation. Nonequilibrium results for the density response function
Erik Schroedter, Michael Bonitz
wiley +1 more source
SciPost PhysicsBethe Ansatz equations for spin-s Heisenberg spin chain with s≥1 are significantly more difficult to analyze than the spin-$\tfrac{1}{2}$ case, due to the presence of repeated roots. As a result, it is challenging to derive extra conditions for the Bethe
Jue Hou, Yunfeng Jiang, Rui-Dong Zhu
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Quantum computing via the Bethe ansatz [PDF]
Quantum Information Processing, 2011 6 pages.
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Accelerating Nonequilibrium Green Functions Simulations: The G1–G2 Scheme and Beyond
physica status solidi (b), Volume 261, Issue 9, September 2024.This article reviews recent developments in the theory of nonequilibrium Green functions (NEGF) where dramatic accelerations are achieved within the time‐local G1–G2 scheme. As a result, longer simulations with more accurate selfenergies are possible. The figure shows an illustration ‐ optical excitation of graphene by a short laser pulse: snapshot of ...
Michael Bonitz +5 more
wiley +1 more source
Finite size effects and the supersymmetric sine-Gordon models [PDF]
, 2003 We propose nonlinear integral equations to describe the groundstate energy of the fractional supersymmetric sine-Gordon models. The equations encompass the N = 1 supersymmetric sine-Gordon model as well as the phi(id,id,adj) perturbation of the SU(2)(L ...
Dunning, Clare
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Exact solution of a two-parameter extended Bariev model
Nuclear Physics BAn exactly solvable strongly correlated electron model with two independent parameters is constructed in the frame of the quantum inverse scattering method, which can be seen as a generalization of the Bariev model. Through the Bethe ansatz method, a set
Mingchen Zheng +4 more
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Y-system for γ-deformed ABJM theory
Journal of High Energy Physics, 2017 We investigate the integrable aspects of the planar γ-deformed ABJM theory and propose the twisted asymptotic Bethe ansatz equations. A more general method through a twisted generating functional is discussed, based on which, the asymptotic large L ...
Hui-Huang Chen, Peng Liu, Jun-Bao Wu
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Beyond Electrons: Correlation and Self‐Energy in Multicomponent Density Functional Theory
ChemPhysChem, Volume 25, Issue 13, July 2, 2024.Developing robust methods to describe the behavior of fermions embedded into an electronic system is vital to computationally tackle these complicated quantum systems. Introducing various new approaches, including a common auxiliary subspace multicomponent resolution‐of‐the‐identity approach, this work provides powerful techniques to extract ...
Christof Holzer, Yannick J. Franzke
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Persistent Currents and Bethe Ansatz [PDF]
, 2011 The system of two electrons interacting with a single impurity in 1D metallic ring is considered illustrating the applicability of the Bethe ...
Matulis, A., Kiršanskas, G.
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Classical and quantum theory of fluctuations for many‐particle systems out of equilibrium
Contributions to Plasma Physics, Volume 64, Issue 5, June 2024.Abstract Correlated classical and quantum many‐particle systems out of equilibrium are of high interest in many fields, including dense plasmas, correlated solids, and ultracold atoms. Accurate theoretical description of these systems is challenging both, conceptionally and with respect to computational resources.
E. Schroedter, M. Bonitz
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