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Title: Semiclassical dynamics of spin density waves

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 3; Related Information: CHORUS Timestamp: 2018-01-10 10:39:11; Journal ID: ISSN 2469-9950
American Physical Society
Country of Publication:
United States

Citation Formats

Chern, Gia-Wei, Barros, Kipton, Wang, Zhentao, Suwa, Hidemaro, and Batista, Cristian D. Semiclassical dynamics of spin density waves. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.035120.
Chern, Gia-Wei, Barros, Kipton, Wang, Zhentao, Suwa, Hidemaro, & Batista, Cristian D. Semiclassical dynamics of spin density waves. United States. doi:10.1103/PhysRevB.97.035120.
Chern, Gia-Wei, Barros, Kipton, Wang, Zhentao, Suwa, Hidemaro, and Batista, Cristian D. 2018. "Semiclassical dynamics of spin density waves". United States. doi:10.1103/PhysRevB.97.035120.
title = {Semiclassical dynamics of spin density waves},
author = {Chern, Gia-Wei and Barros, Kipton and Wang, Zhentao and Suwa, Hidemaro and Batista, Cristian D.},
abstractNote = {},
doi = {10.1103/PhysRevB.97.035120},
journal = {Physical Review B},
number = 3,
volume = 97,
place = {United States},
year = 2018,
month = 1

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 10, 2019
Publisher's Accepted Manuscript

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  • No abstract prepared.
  • The linearized semiclassical initial value representation (LSC-IVR) [H. Wang, X. Sun and W. H. Miller, J. Chem. Phys. {bold 108}, 9726 (1998)] is used to study the nonadiabatic dynamics of the spin-boson problem, a system of two electronic states linearly coupled to an infinite bath of harmonic oscillators. The spectral density of the bath is chosen to be of the Debye form, which is often used to model the solution environment of a charge transfer reaction. The simulation provides a rather complete understanding of the electronically nonadiabatic dynamics in a broad parameter space, including coherent to incoherent transitions along allmore » three axes (the {ital T}-axis, the {eta}-axis, and the {omega}{sub c}-axis) in the complete phase diagram and the determination of rate constants in several physically interesting regimes. Approximate analytic theories are used to compare with the simulation results, and good agreement is found in the appropriate physical limits. {copyright} {ital 1999 American Institute of Physics.}« less
  • Spin-density waves (SDWs) are broken-symmetry ground states of metals, the name referring to the periodic modulation of the spin density with period, [lambda][sub 0]=[pi]/[ital k][sub [ital F]], determined by the Fermi wave vector [ital k][sub [ital F]]. The state, originally postulated by Overhauser, has been found in several organic linear-chain compounds. The development of the SDW state opens up a gap in the single-particle excitation spectrum, and the ground state is close to that of an antiferromagnet, as shown by a wide range of magnetic studies. Because of the magnetic ground state and of the incommensurate periodic spin modulation (whichmore » can be thought of as two periodic charge modulations in the two spin subbands), both collective charge and spin excitations may occur. These couple to ac magnetic and electric fields, which leads to antiferromagnetic resonances and frequency-dependent collective-mode conductivity. Both have been observed in the spin-density-wave ground state. The interaction of the collective mode with impurities pins the mode to the underlying lattice, and therefore the collective-mode charge excitations occur at finite frequencies in the long-wavelength limit. The mode can also be induced to execute a translational motion upon the application of a dc field which exceeds the threshold field [ital E][sub [ital T]]. Many of the observations on the ac, and on the nonlinear dc, response are similar to those which occur in materials with a charge-density-wave ground state. At low temperatures a novel type of collective transport suggestive of a tunneling process is observed. These low-temperature phenomena remain unexplained.« less
  • The semiclassical formulation of the Skyrme energy density functional for spin-orbit density part of the interaction potential is compared with the microscopic shell model formulation, at both the ground state and finite temperatures. The semiclassical spin-orbit interaction potential is shown to contain exactly the same shell effects as are there in the microscopic shell model, provided a normalization of all semiclassical results to the spin-saturated case (for one or both nuclei as spin-saturated) is made. On the other hand, the {alpha} nucleus structure present in microscopic shell model is found absent in semiclassical approach. The role of temperature is foundmore » not to change the behavior of shell or {alpha} nucleus structure effects up to about 3 MeV, and increase or decrease the height of the (normalized) barriers in accordance with the shell structure of nuclei. Calculations are made for three two-nucleon transfer reactions forming the {alpha}-nucleus A=4n,N=Z compound systems {sup 56}Ni{sup *} and {sup 48}Cr{sup *} and the non-{alpha}-nucleus compound system {sup 52}Cr{sup *}, and for Skyrme forces SIII and SLy4. The two parameter Fermi density, with its parameters fitted to experiments and made temperature dependent in a model way, is used for the nuclear density in semiclassical calculations, and the same in microscopic shell model is achieved via the Fermi-Dirac occupation of shell model states and particle number conservation.« less
  • Quantum analogs of Kolmogorov-Arnol'd-Moser tori and chaos in a periodically pulsed single-spin system are studied in the semiclassical regime. Wave functions (quasienergy states) are described in a spin-coherent state representation. Their projected binary-phase patterns are characterized in terms of the fractal dimensions of their perimeters.