Zobrazeno 1 - 10
of 896
pro vyhledávání: '"Vignale G"'
We present an ab initio method for eletcronic structure calculations, which accounts for the interaction of electrons and magnons in ferromagnets. While it is based on a many body perturbation theory we approximate numerically complex quantities with
Externí odkaz:
http://arxiv.org/abs/2212.06420
Publikováno v:
Phys. Rev. B 104, 115165 (2021)
We apply quantum continuum mechanics to the calculation of the excitation spectrum of a coupled electron-hole bilayer. The theory expresses excitation energies in terms of ground-state intra- and inter-layer pair correlation functions, which are avai
Externí odkaz:
http://arxiv.org/abs/2107.12063
Autor:
Yudhistira, I., Chakraborty, N., Sharma, G., Ho, D. Y. H., Laksono, E., Sushkov, O. P., Vignale, G., Adam, S.
Publikováno v:
Phys. Rev. B 99, 140302 (2019)
Recent experiments on twisted bilayer graphene (tBG) close to magic angle show that a small relative rotation in a van der Waals heterostructure greatly alters its electronic properties. We consider various scattering mechanisms and show that the car
Externí odkaz:
http://arxiv.org/abs/1902.01405
Publikováno v:
Eur. Phys. J. B (2018) 91: 173
Ab initio calculations of the magnon dispersion in ferromagnetic materials typically rely on the adiabatic local density approximation (ALDA) in which the effective exchange-correlation field is everywhere parallel to the magnetization. These calcula
Externí odkaz:
http://arxiv.org/abs/1804.04556
A semi-relativistic density-functional theory that includes spin-orbit couplings and Zeeman fields on equal footing with the electromagnetic potentials, is an appealing framework to develop a unified first-principles computational approach for non-co
Externí odkaz:
http://arxiv.org/abs/1704.07304
Publikováno v:
Phys. Rev. B 96, 035132 (2017)
We discuss the potential advantages of calculating the effective mass of quasiparticles in the interacting electron liquid from the low-temperature free energy vis-a-vis the conventional approach, in which the effective mass is obtained from approxim
Externí odkaz:
http://arxiv.org/abs/1704.04076
Publikováno v:
J. Phys.: Condens. Matter 29, 063001 (2017)
We review the progress that has been recently made in the application of time-dependent density functional theory to thermoelectric phenomena. As the field is very young, we emphasize open problems and fundamental issues. We begin by introducing the
Externí odkaz:
http://arxiv.org/abs/1607.05464
Publikováno v:
Phys. Rev. Lett. 116, 237202 (2016)
Quantized spin waves, or magnons, in a magnetic insulator are assumed to interact weakly with the surroundings, and to flow with little dissipation or drag, producing exceptionally long diffusion lengths and relaxation times. In analogy to Coulomb dr
Externí odkaz:
http://arxiv.org/abs/1605.04336
Publikováno v:
Phys. Rev. B 93, 134309 (2016)
We analyze the short-time behavior of the heat and charge currents through nanoscale conductors exposed to a temperature gradient. To this end, we employ Luttinger's thermomechanical potential to simulate a sudden change of temperature at one end of
Externí odkaz:
http://arxiv.org/abs/1601.07807
Autor:
Mower, Matthew D., Vignale, G.
We study spin relaxation in dilute magnetic semiconductors near a ferromagnetic transition, where spin fluctuations become strong. An enhancement in the scattering rate of itinerant carriers from the spin fluctuations of localized impurities leads to
Externí odkaz:
http://arxiv.org/abs/1509.07926