Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session G60: Poster Session I
2:00 PM,
Tuesday, March 6, 2018
LACC
Room: West Hall A
Abstract ID: BAPS.2018.MAR.G60.131
Abstract: G60.00131 : Quasianalytical treatment of the spin Seebeck effect on the Na2 molecule
Presenter:
Georgios Lefkidis
(Univ Kaiserslautern and Research Center OPTIMAS)
Authors:
Georgios Lefkidis
(Univ Kaiserslautern and Research Center OPTIMAS)
Sebastian Reyes
(Facultad de Física, Pontificia Universidad Católica de Chile)
Here we report an ab initio method to calculate the SSE on finite systems, and demonstrate it quasianalytically on Na2. The system is coupled to two baths with different temperatures, described with a Lindblad superoperator. We mainly focus on how to divide any operator into spatially localized contributions and show that the spatial localization of the virtual excitations (i.e., splitting of the ladder operators into two sets of localized operators with different eigenbases) is the underlying reason for the SSE. We also analyze the precession angles on the localized spins, and find that a broadening of the temperature-induced transitions leads to noncollinear magnetism. Finally, we show the connection between the SSE and the electronic entanglement in the system [2].
[1] K. Uchida, S. Takahashi, K. Harii, J. Ieda, W. Koshibae, K. Ando, S. Maekawa, and E. Saitoh, Nature (London) 455, 778 (2008)
[2] G. Lefkidis and S. A. Reyes, Phys. Rev. B 94, 144433 (2016)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.G60.131
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