Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session G70: Poster Session I (2:00pm-5:00pm)
2:00 PM,
Tuesday, March 5, 2019
BCEC
Room: Exhibit Hall
Abstract: G70.00150 : Effect of electron transport on demagnetization on the shortest time scale*
Presenter:
Guoping Zhang
(Indiana State University)
Authors:
Guoping Zhang
(Indiana State University)
Yihua Bai
(Indiana State University)
Tyler Jenkins
(Indiana State University)
Thomas F George
(University of Missouri-St. Louis)
the other is to utilize ultrafast hot electron transport without SOC. The challenge is that these two processes are entangled on the same time scale. However, we do not even know how fast electrons move under laser excitation,
nor far they move [2]. Here we carry out a first-principles time-dependent calculation to investigate how fast electrons actually move under laser excitation, and how large the electron transport affects demagnetization on
the shortest time scale. To take into account the transport effect, we implement the intraband transition in our theory. For bulk fcc Ni, we find the effect of spin transport on demagnetization to be extremely small, no
more than 1% [3].
[1] E. Beaurepaire, J. C. Merle, A. Daunois, and J.-Y. Bigot, Phys. Rev. Lett. 76, 4250 (1996).
[2] G. P. Zhang and W. Hübner, Phys. Rev. Lett. 85, 3025 (2000).
[3] G. P. Zhang, Y. H. Bai, T. Jenkins, and T. F. George, J. Phys.: Condens. Matter (in press, 2018)
*Supported by the U.S. Department of Energy under Contract No. DE-FG02-06ER46304.
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