Magnetic field effects on switching noise in a quantum point contact

Autor: Jaap I. Dijkhuis, H. van Houten, A.J. Scholten, Bruce W. Alphenaar, C. T. Foxon, F. Liefrink, C. Dekker
Jazyk: angličtina
Rok vydání: 1992
Předmět:
A7340L Electrical properties of semiconductor to semiconductor contacts
p n junctions
and heterojunctions
conduction band
noise
quantum Hall regime
fluctuations
Quantum point contact
conduction band bottom
magnetic field
Quantum Hall effect
quantum Hall effect
switching noise
transconductance
g factor
size effect
Rectangular potential barrier
interface electron states
magnetic field effects
conduction bands
quantum point contact
Physics
random noise
Lande g factor
model
point contacts
Condensed matter physics
zero magnetic field
Quantum noise
temporal electrostatic fluctuations
GaAs Al sub x Ga sub 1 x As
aluminium compounds
A7270 Noise processes and phenomena in electronic transport
semiconductor
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
A7320A Surface states
band structure
electron density of states
gallium arsenide
Magnetic field
INSPEC
quantum size effect
Quantum dot
A7220M Galvanomagnetic and other magnetotransport effects semiconductors/insulators
III V semiconductors
Fermi gas
Noise (radio)
Zdroj: Physical review B.Condensed matter and materials physics 46(23), 15523-15525. (1992)
ISSN: 0163-1829
Popis: We extend a previous study of the quantum-size effect on switching noise in a GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As quantum point contact in zero magnetic field to the quantum Hall regime. The experimental results agree well with a model based on temporal electrostatic fluctuations of the conduction-band bottom in the point contact. A confirmation of our interpretation is obtained by a direct comparison of the noise data with measurements of the transconductance. The analysis of the data suggests that the Land\'e g factor in a quantum point contact is enhanced with respect to the low bare g factor of GaAs.
Databáze: OpenAIRE
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