Spin-orbit splitting of the conduction band in HgTe quantum wells: Role of different mechanisms

Autor: A. V. Germanenko, V. Ya. Aleshkin, O. E. Rut, A. A. Sherstobitov, N. N. Mikhailov, G. M. Minkov, S. A. Dvoretski
Rok vydání: 2019
Předmět:
ELECTRON DENSITY MEASUREMENT
Electron density
QUANTUM CHEMISTRY
SHUBNIKOV DE-HAAS OSCILLATION
media_common.quotation_subject
CARRIER CONCENTRATION
FOS: Physical sciences
Electron
Fourier spectrum
01 natural sciences
Asymmetry
010305 fluids & plasmas
ENERGY SPECTRA
INVERSION ASYMMETRY
ELECTRON TRANSPORT
SPIN-ORBIT SPLITTINGS
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
SELF-CONSISTENT CALCULATION
MERCURY COMPOUNDS
010306 general physics
Conduction band
Quantum well
SEMICONDUCTOR QUANTUM WELLS
media_common
Physics
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Oscillation
CONDUCTION BANDS
TELLURIUM COMPOUNDS
Materials Science (cond-mat.mtrl-sci)
QUANTUM WELLS
DIFFERENT MECHANISMS
ENERGY SPECTRUM
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter Physics
Electron transport chain
ELECTRON TRANSPORT PROPERTIES
Atomic and Molecular Physics
and Optics
Electronic
Optical and Magnetic Materials
LOW-FREQUENCY COMPONENTS
Zdroj: Phys E
Physica E: Low-Dimensional Systems and Nanostructures
ISSN: 1386-9477
DOI: 10.1016/j.physe.2019.02.007
Popis: Spin-orbit splitting of conduction band in HgTe quantum wells was studied experimentally. In order to recognize the role of different mechanisms, we carried out detailed measurements of the Shubnikov-de Haas oscillations in gated structures with a quantum well widths from $8$ to $18$ nm over a wide range of electron density. With increasing electron density controlled by the gate voltage, splitting of the maximum of the Fourier spectrum $f_0$ into two components $f_1$ and $f_2$ and the appearance of the low-frequency component $f_3$ was observed. Analysis of these results shows that the components $f_1$ and $f_2$ give the electron densities $n_1$ and $n_2$ in spin-orbit split subbands while the $f_3$ component results from magneto-intersubband oscillations so that $f_3=f_1 - f_2$. Comparison of these data with results of self-consistent calculations carried out within the framework of four-band \emph{kP}-model shows that a main contribution to spin-orbit splitting comes from the Bychkov-Rashba effect. Contribution of the interface inversion asymmetry to the splitting of the conduction band turns out to be four-to-five times less than that for the valence band in the same structures.
6 pages, 6 figures
Databáze: OpenAIRE
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