Coulomb Blockade as a Noninvasive Probe of Local Density of States
- 8 July 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 77 (2), 350-353
- https://doi.org/10.1103/physrevlett.77.350
Abstract
We show that a system of two closely separated two-dimensional electron gases in a GaAs/AlGaAs system in which one is formed into a quantum dot can be used as a Coulomb blockade electrometer. The blockade is used to explore the density of states of the other electron gas which is patterned as a wire. Electron localization is observed and shows behavior in a magnetic field arising from the destruction of quantum interference and subsequent wave-function shrinkage. The dimensionality of the transport changes as the carrier concentration is increased, with the inferred density of states changing from quasi-one-dimensional to two dimensional.Keywords
This publication has 19 references indexed in Scilit:
- Compressibility of the two-dimensional electron gas: Measurements of the zero-field exchange energy and fractional quantum Hall gapPhysical Review B, 1994
- Fabrication of independent contacts to two closely spaced two-dimensional electron gases using molecular beam epitaxy regrowth and in situ focused ion beam lithographyJournal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 1994
- Capacitance, admittance, and rectification properties of small conductorsJournal of Physics: Condensed Matter, 1993
- Mesoscopic capacitorsPhysics Letters A, 1993
- Measurements of Coulomb blockade with a noninvasive voltage probePhysical Review Letters, 1993
- The Landau level density of states as a function of Fermi energy in the two dimensional electron gasSolid State Communications, 1992
- Resonant magneto-transport through a lateral quantum box in a semiconductor heterostructureJournal of Physics: Condensed Matter, 1989
- The transition from one- to zero-dimensional ballistic transportJournal of Physics C: Solid State Physics, 1988
- Quantum capacitance devicesApplied Physics Letters, 1988
- Direct measurement of the density of states of a two-dimensional electron gasPhysical Review B, 1985