Optical Generation of Hot Spin-Polarized Electrons from a Ferromagnetic Two-Dimensional Electron Gas

被引：2
|
作者：
Ellguth, Martin [1 ]
Tusche, Christian [1 ]
Kirschner, Juergen [1 ,2 ]
机构：
[1] Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany
[2] Univ Halle Wittenberg, Inst Phys, D-06120 Halle, Germany
来源：
PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 26期
关键词：
VALENCE-BAND PHOTOEMISSION; MAGNETIC DICHROISM; INJECTION; SPECTROSCOPY; SPINTRONICS; TRANSPORT; EMISSION; FILMS; METAL;
D O I：
10.1103/PhysRevLett.115.266801
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Linearly polarized light with an energy of 3.1 eV has been used to excite highly spin-polarized electrons in an ultrathin film of face-centered-tetragonal cobalt to majority-spin quantum well states (QWS) derived from an sp band at the border of the Brillouin zone. The spin-selective excitation process has been studied by spin-and momentum-resolved two-photon photoemission. Analyzing the photoemission patterns in two-dimensional momentum planes, we find that the optically driven transition from the valence band to the QWS acts almost exclusively on majority-spin electrons. The mechanism providing the high spin polarization is discussed by the help of a density-functional theory calculation. Additionally, a sizable effect of spin-orbit coupling for the QWS is evidenced.
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页数：5
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