Entanglement and manipulation of the magnetic and spin-orbit order in multiferroic Rashba semiconductors

被引：78

作者：

Krempasky, J. ^{[1
]}

Muff, S. ^{[1
,2
]}

Bisti, F. ^{[1
]}

Fanciulli, M. ^{[1
,2
]}

Volfova, H. ^{[3
]}

Weber, A. P. ^{[1
,2
]}

Pilet, N. ^{[1
]}

Warnicke, P. ^{[1
]}

Ebert, H. ^{[3
]}

Braun, J. ^{[3
]}

Bertran, F. ^{[4
]}

Volobuev, V. V. ^{[5
,7
]}

Minar, J. ^{[3
,6
]}

Springholz, G. ^{[7
]}

Dil, J. H. ^{[1
,2
]}

Strocov, V. N. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[3] Univ Munich, Dept Chem, D-81377 Munich, Germany

[4] SOLEIL Synchrotron, F-91192 Gif Sur Yvette, France

[5] Natl Tech Univ, Kharkiv Polytech Inst, Frunze Str 21, UA-61002 Kharkov, Ukraine

[6] Univ West Bohemia, New Technol Res Ctr, Plzen, Czech Republic

[7] Johannes Kepler Univ Linz, Inst Halbleiter & Festkorperphys, A-4040 Linz, Austria

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

瑞士国家科学基金会;

关键词：

TOPOLOGICAL INSULATOR; MAJORANA FERMIONS; SURFACE; PHASE; TRANSITION; EMERGENCE;

D O I：

10.1038/ncomms13071

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Entanglement of the spin-orbit and magnetic order in multiferroic materials bears a strong potential for engineering novel electronic and spintronic devices. Here, we explore the electron and spin structure of ferroelectric alpha-GeTe thin films doped with ferromagnetic Mn impurities to achieve its multiferroic functionality. We use bulk-sensitive soft-X-ray angle-resolved photoemission spectroscopy (SX-ARPES) to follow hybridization of the GeTe valence band with the Mn dopants. We observe a gradual opening of the Zeeman gap in the bulk Rashba bands around the Dirac point with increase of the Mn concentration, indicative of the ferromagnetic order, at persistent Rashba splitting. Furthermore, subtle details regarding the spin-orbit and magnetic order entanglement are deduced from spin-resolved ARPES measurements. We identify antiparallel orientation of the ferroelectric and ferromagnetic polarization, and altering of the Rashba-type spin helicity by magnetic switching. Our experimental results are supported by first-principles calculations of the electron and spin structure.

引用

页数：7

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