Collimation effects in quantum point contacts
β Scribed by R.P. Taylor; A.S. Sachrajda; J.A. Adams; P. Zawadzki; P.T. Coleridge; P. Marshall
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 22 KB
- Volume
- 176
- Category
- Article
- ISSN
- 0921-4526
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π SIMILAR VOLUMES
We present a versatile design of freely suspended quantum point contacts with particular large onedimensional subband quantization energies of up to βΞ΅ β 10 meV. The nanoscale bridges embedding a two-dimensional electron system are fabricated from AlGaAs/GaAs heterostructures by electronbeam lithogr
We discuss the appearance of strong nonlinearities including S-type negative differential conductance in the I -V characteristics of quantum point contact (QPC) structures. Timedependent measurements demonstrate that the highly nonlinear d.c. I -V features are associated with a temporal average of r
We present studies of the role of charge fluctuations in transport through a quantum point contact (QPC). Our model of QPC is based on assumption of a specific electronic energy structure with a resonant level below the electronic sub-band. We show that charge fluctuations lead to a dynamical Coulom