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pro vyhledávání: '"Edwards, D. M."'
Autor:
Edwards, D. M.
There is a widely-held belief amongst theoreticians that the Gilbert damping parameter {\alpha} in magnetization dynamics is infinite for a pure metal at T=0. The basic error leading to this belief is pointed out explicitly and the various methods of
Externí odkaz:
http://arxiv.org/abs/1809.09429
Autor:
Edwards, D. M.
Damping of magnetization dynamics in a ferromagnetic metal is usually characterized by the Gilbert parameter alpha. Recent calculations of this quantity, using a formula due to Kambersky, find that it is infinite for a perfect crystal owing to an int
Externí odkaz:
http://arxiv.org/abs/1506.05622
Autor:
Edwards, D M
The problem of a single down spin particle interacting with a Fermi sea of up spin particles is of current interest in the field of cold atoms. The Hubbard model, appropriate to atoms in an optical lattice potential, is considered in parallel with a
Externí odkaz:
http://arxiv.org/abs/1307.7937
Publikováno v:
J. Phys.: Condens. Matter 22, 435601 (2010)
Holes in a Mott insulator are represented by spinless fermions in the fermion-boson model introduced by Edwards. Although the physically interesting regime is for low to moderate fermion density the model has interesting properties over the whole den
Externí odkaz:
http://arxiv.org/abs/1007.1342
Publikováno v:
Phys. Rev. B. 80, 241413(R) (2009)
Motivated by recent studies reporting the formation of localized magnetic moments in doped graphene, we investigate the energetic cost for spin polarizing isolated impurities embedded in this material. When a well-known criterion for the formation of
Externí odkaz:
http://arxiv.org/abs/0908.4516
Publikováno v:
J. Phys. Conf. Series 220, 012023 (2010)
In classical Drude theory the conductivity is determined by the mass of the propagating particles and the mean free path between two scattering events. For a quantum particle this simple picture of diffusive transport loses relevance if strong correl
Externí odkaz:
http://arxiv.org/abs/0906.4625
Autor:
Edwards, D. M., Wessely, O.
An extended Landau-Lifshitz-Gilbert (LLG) equation is introduced to describe the dynamics of inhomogeneous magnetization in a current-carrying wire. The coefficients of all the terms in this equation are calculated quantum-mechanically for a simple m
Externí odkaz:
http://arxiv.org/abs/0811.4118
Autor:
Aziz, A., Wessely, O. P., Ali, M., Edwards, D. M., Marrows, C. H., Hickey, B. J., Blamire, M. G.
The field of spin electronics (spintronics) was initiated by the discovery of giant magnetoresistance (GMR) for which Fert[1] and Grunberg[2] were awarded the 2007 Nobel Prize for Physics. GMR arises from differential scattering of the majority and m
Externí odkaz:
http://arxiv.org/abs/0810.2093
Publikováno v:
Phys. Rev. Lett. 101, 116402 (2008)
We investigate charge transport within some background medium by means of an effective lattice model with a novel form of fermion-boson coupling. The bosons describe fluctuations of a correlated background. By analyzing groundstate and spectral prope
Externí odkaz:
http://arxiv.org/abs/0802.0991
Publikováno v:
Phys. Rev. Lett. 98, 056602 (2007)
We study the interplay of collective dynamics and damping in the presence of correlations and bosonic fluctuations within the framework of a newly proposed model, which captures the principal transport mechanisms that apply to a variety of physical s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0610592