Spin Orientation of Two-Dimensional Electrons Driven by Temperature-Tunable Competition of Spin-Orbit and Exchange-Magnetic Interactions

被引:32
作者
Generalov, Alexander [1 ]
Otrokov, Mikhail M. [2 ,3 ,4 ]
Chikina, Alla [5 ]
Kliemt, Kristin [6 ]
Kummer, Kurt [7 ]
Hoeppner, Marc [8 ]
Guettler, Monika [5 ]
Seiro, Silvia [9 ]
Fedorov, Alexander [10 ]
Schulz, Susanne [5 ]
Danzenbaecher, Steffen [5 ]
Chulkov, Evgueni V. [2 ,3 ,4 ,11 ]
Geibel, Christoph [9 ]
Laubschat, Clemens [5 ]
Dudin, Pavel [12 ]
Hoesch, Moritz [12 ]
Kim, Timur [12 ]
Radovic, Milan [13 ,14 ]
Shi, Ming [13 ]
Plumb, Nicholas C. [13 ]
Krellner, Cornelius [6 ]
Vyalikh, Denis V. [2 ,3 ,5 ,11 ,15 ]
机构
[1] Lund Univ, MAX Lab 4, Box 118, S-22100 Lund, Sweden
[2] Dept Fis Mat, San Sebastian 20080, Spain
[3] CFM MPC UPV EHU, Donostia Int Phys Ctr, San Sebastian 20080, Spain
[4] Tomsk State Univ, Lenina Av 36, Tomsk 634050, Russia
[5] Tech Univ Dresden, Inst Solid State Phys, Zellescher Weg 16, D-01062 Dresden, Germany
[6] Goethe Univ Frankfurt, Inst Phys, Kristall & Mat Lab, Max von Laue Str 1, D-60438 Frankfurt, Germany
[7] European Synchrotron Radiat Facil, 71 Ave Martyrs, F-38043 Grenoble 9, France
[8] Max Planck Inst Solid State Res, Heisenberg Str 1, D-70569 Stuttgart, Germany
[9] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany
[10] IFW Dresden, POB 270116, D-01171 Dresden, Germany
[11] St Petersburg State Univ, St Petersburg 198504, Russia
[12] Diamond Light Source, Didcot OX11 0DE, Oxon, England
[13] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
[14] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland
[15] Basque Fdn Sci, Ikerbasque, Bilbao 48011, Spain
关键词
Spin-orbit coupling; exchange-magnetic interaction; rare-earth intermetallics; antiferromagnetism; ARPES; ITINERANT; SURFACES; HORH2SI2; PLANE; ORDER; GAS;
D O I
10.1021/acs.nanolett.6b04036
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Finding ways to create and control the spin-dependent properties of two-dimensional electron states (2DESs) is a major challenge for the elaboration of novel spin based devices. Spin orbit and exchange magnetic interactions (SOI and EMI) are two fundamental fundamental mechanisms that enable access to the tunability of spin-dependent properties of carriers. The silicon surface of HoRh2Si2 appears to be a unique model system, where concurrent SOT and EMI can be visualized and controlled by varying the temperature. The beauty and simplicity of this system lie in the 4f moments, which act as a multiple tuning instrument on the 2DESs, as the 4f projections parallel and perpendicular to the surface order at essentially different temperatures. Here we show that the SOI locks the spins of the 2DESs exclusively in the surface plane when the 4f moments are disordered: the Rashba-Bychkov effect. When the temperature is gradually lowered and the system experiences magnetic order, the rising EMI progressively competes with the SOT leading to a fundamental change in the spin-dependent properties of the 2DESs. The spins rotate and reorient toward the out-of-plane Ho 4f moments. Our findings show that the direction of the spins and the spin-splitting of the two-dimensional electrons at the surface can be manipulated in a controlled way by using only one parameter: the temperature.
引用
收藏
页码:811 / 820
页数:10
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