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

Generalov, AlexanderLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory (author)

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 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 SOI 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 SOI 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.

Otrokov, Mikhail M.Donostia International Physics Center (DIPC),Tomsk State University (author)
Chikina, AllaDresden University of Technology (author)
Kliemt, KristinGoethe University (author)
Kummer, KurtEuropean Synchrotron Radiation Facility (author)
Höppner, MarcMax Planck Institute for Solid State Research (author)
Güttler, MonikaDresden University of Technology (author)
Seiro, SilviaMax Planck Institute for Chemical Physics of Solids (author)
Fedorov, AlexanderLeibniz Institute for Solid State and Materials Research (author)
Schulz, SusanneDresden University of Technology (author)
Danzenbächer, SteffenDresden University of Technology (author)
Chulkov, Evgueni V.Donostia International Physics Center (DIPC),Tomsk State University,Saint Petersburg State University (author)
Geibel, ChristophMax Planck Institute for Chemical Physics of Solids (author)
Laubschat, ClemensDresden University of Technology (author)
Dudin, PavelDiamond Light Source (author)
Hoesch, MoritzDiamond Light Source (author)
Kim, TimurDiamond Light Source (author)
Radovic, MilanPaul Scherrer Institute (author)
Shi, MingPaul Scherrer Institute (author)
Plumb, Nicholas C.Paul Scherrer Institute (author)
Krellner, CorneliusGoethe University (author)
Vyalikh, Denis V.Basque Foundation for Science,Donostia International Physics Center (DIPC),Paul Scherrer Institute,Dresden University of Technology (author)
Lunds universitetMAX IV-laboratoriet (creator_code:org_t)

In:Nano Letters: American Chemical Society (ACS)17:2, s. 811-8201530-69841530-6992

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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