scholarly journals When can localized spins interacting with conduction electrons in ferro- or antiferromagnets be described classically via the Landau-Lifshitz equation: Transition from quantum many-body entangled to quantum-classical nonequilibrium states

2021 ◽  
Vol 104 (21) ◽  
Author(s):  
Priyanka Mondal ◽  
Abhin Suresh ◽  
Branislav K. Nikolić
Keyword(s):  
Many Body ◽  
Conduction Electrons ◽  
Lifshitz Equation ◽  
Nonequilibrium States

scholarly journals A Simple Derivation of the Bloch Equations for Localized Moment E.S.R. in Metals in the Presence of Anisotropy

1973 ◽  
Vol 26 (4) ◽  
pp. 475 ◽  
Author(s):  
DA Smith
Keyword(s):  
Electron Spin Resonance ◽  
Density Matrix ◽  
Matrix Approach ◽  
Many Body ◽  
Bloch Equations ◽  
Simple Derivation ◽  
Local Moments ◽  
Conduction Electrons ◽  
Spin Resonance ◽  
Body Techniques

A density-matrix approach is used to derive the coupled Bloch equations for the electron spin resonance of localized moments and conduction electrons in metals, including anisotropy fields acting on the local moments. The equations agree with those obtained elsewhere by more sophisticated many-body techniques. In particular, it is demonstrated explicitly that relaxation proceeds towards instantaneous equilibrium.

scholarly journals Predicting Imperfect Echo Dynamics in Many-Body Quantum Systems

2020 ◽  
Vol 75 (5) ◽  
pp. 403-411 ◽  
Author(s):  
Lennart Dabelow ◽  
Peter Reimann
Keyword(s):  
Nonequilibrium State ◽  
Quantum Systems ◽  
Many Body ◽  
Echo Signal ◽  
Initial State ◽  
Time Period ◽  
Nonequilibrium States ◽  
The Many ◽  
Backward Propagation ◽  
Analytic Prediction

AbstractEcho protocols provide a means to investigate the arrow of time in macroscopic processes. Starting from a nonequilibrium state, the many-body quantum system under study is evolved for a certain period of time τ. Thereafter, an (effective) time reversal is performed that would – if implemented perfectly – take the system back to the initial state after another time period τ. Typical examples are nuclear magnetic resonance imaging and polarisation echo experiments. The presence of small, uncontrolled inaccuracies during the backward propagation results in deviations of the “echo signal” from the original evolution and can be exploited to quantify the instability of nonequilibrium states and the irreversibility of the dynamics. We derive an analytic prediction for the typical dependence of this echo signal for macroscopic observables on the magnitude of the inaccuracies and on the duration τ of the process, and verify it in numerical examples.

Concept of entropy for nonequilibrium states of closed many-body systems

1991 ◽  
Vol 43 (12) ◽  
pp. 6657-6663 ◽  
Author(s):  
J. L. del Río-Correa ◽  
L. S. García-Colín
Keyword(s):  
Many Body ◽  
Nonequilibrium States ◽  
Many Body Systems

Novel simulation model for many-body multipole dispersion interactions

1998 ◽  
Vol 94 (3) ◽  
pp. 417-433 ◽  
Author(s):  
MARTIN VAN DER HOEF ◽  
PAUL MADDEN
Keyword(s):  
Simulation Model ◽  
Dispersion Interactions ◽  
Many Body

On the many-body theory of nuclear reactions

1968 ◽  
Vol 111 (1) ◽  
pp. 392-416 ◽  
Author(s):  
K DIETRICH ◽  
K HARA
Keyword(s):  
Nuclear Reactions ◽  
Many Body ◽  
Many Body Theory ◽  
The Many ◽  
Body Theory

MANY-BODY THEORY FOR HYPERFINE EFFECTS IN ATOMS AND MOLECULES

1970 ◽  
Vol 31 (C4) ◽  
pp. C4-99-C4-104
Author(s):  
T. P. DAS ◽  
C. M. DUTTA ◽  
N. C. DUTTA
Keyword(s):  
Many Body ◽  
Atoms And Molecules ◽  
Many Body Theory ◽  
Body Theory

State of the conduction electrons and the work function of a metal

1994 ◽  
Vol 164 (4) ◽  
pp. 375 ◽  
Author(s):  
B.V. Vasil'ev ◽  
M.I. Kaganov ◽  
V.L. Lyuboshits
Keyword(s):  
Work Function ◽  
Conduction Electrons
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