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Split-gate quantum point contacts with tunable channel length
- Source :
- Journal of Applied Physics, 113(2):024507. AMER INST PHYSICS
- Publication Year :
- 2013
-
Abstract
- We report on developing split-gate quantum point contacts (QPCs) that have a tunable length for the transport channel. The QPCs were realized in a GaAs/AlGaAs heterostructure with a two- dimensional electron gas (2DEG) below its surface. The conventional design uses 2 gate fingers on the wafer surface which deplete the 2DEG underneath when a negative gate voltage is applied, and this allows for tuning the width of the QPC channel. Our design has 6 gate fingers and this provides additional control over the form of the electrostatic potential that defines the channel. Our study is based on electrostatic simulations and experiments and the results show that we developed QPCs where the effective channel length can be tuned from about 200 nm to 600 nm. Length-tunable QPCs are important for studies of electron many-body effects because these phenomena show a nanoscale dependence on the dimensions of the QPC channel.
- Subjects :
- Physics
DIMENSIONAL ELECTRON-GAS
DEVICES
Condensed Matter - Mesoscale and Nanoscale Physics
business.industry
General Physics and Astronomy
FOS: Physical sciences
Heterojunction
Electron
QUANTIZED CONDUCTANCE
HETEROSTRUCTURE
STATES
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Optoelectronics
Point (geometry)
Wafer
Fermi gas
business
Quantum
Nanoscopic scale
Communication channel
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 113
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi.dedup.....53d840115ce0c7414f59927214130e75