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.

引用

页数：5

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