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Quantum effects in a germanium quantum well with ultrahigh mobility of charge carrier
- Source :
- Low Temperature Physics. 45:1202-1208
- Publication Year :
- 2019
- Publisher :
- AIP Publishing, 2019.
-
Abstract
- Quantum effects in p-type Si0.2Ge0.8/Ge/Si0.2Ge0.8 heterostructure with an extremely high mobility of charge carriers μH = 1367000 cm2/(V ⋅ s) have been comprehensively studied. An analysis of Shubnikov–de Haas oscillations yielded effective mass of charge carriers, which proved to be very low, m* = 0.062m0, and the value of fluctuations of hole density along the channel δp = 3.5 ⋅ 109 cm–2. The fractional Hall effect (filling numbers 8/3, 7/3, 5/3, 4/3) observed at temperatures up to 5 K has been discovered in strong magnetic fields. The studies of quantum interference effects related to weak localization and electron-electron interaction between charge carriers, which have been conducted in such a high-mobility system for the first time, enabled calculation of spin splitting Δ = 1.07 meV and the Fermi-liquid coupling constant F 0 σ = − 0.12, which agree with results obtained earlier.Quantum effects in p-type Si0.2Ge0.8/Ge/Si0.2Ge0.8 heterostructure with an extremely high mobility of charge carriers μH = 1367000 cm2/(V ⋅ s) have been comprehensively studied. An analysis of Shubnikov–de Haas oscillations yielded effective mass of charge carriers, which proved to be very low, m* = 0.062m0, and the value of fluctuations of hole density along the channel δp = 3.5 ⋅ 109 cm–2. The fractional Hall effect (filling numbers 8/3, 7/3, 5/3, 4/3) observed at temperatures up to 5 K has been discovered in strong magnetic fields. The studies of quantum interference effects related to weak localization and electron-electron interaction between charge carriers, which have been conducted in such a high-mobility system for the first time, enabled calculation of spin splitting Δ = 1.07 meV and the Fermi-liquid coupling constant F 0 σ = − 0.12, which agree with results obtained earlier.
- Subjects :
- 010302 applied physics
Physics
Coupling constant
Physics and Astronomy (miscellaneous)
General Physics and Astronomy
Heterojunction
01 natural sciences
Shubnikov–de Haas effect
Weak localization
Effective mass (solid-state physics)
Hall effect
Quantum mechanics
0103 physical sciences
Charge carrier
010306 general physics
Quantum well
Subjects
Details
- ISSN :
- 10906517 and 1063777X
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- Low Temperature Physics
- Accession number :
- edsair.doi...........67d8947e8f03e9c9001c925c35aaf6e0
- Full Text :
- https://doi.org/10.1063/10.0000126