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Article
Atomic-beam study of the 5-min solar wavelength oscillations
Long records of the wavelength oscillations of the solar 7699 Å potassium line have been obtained with an atomic-beam resonance-scattering apparatus taken to Kitt Peak. Data are presented giving the dependence...
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Chapter and Conference Paper
High Precision de Haas-Van Alphen Measurements on a Two-Dimensional Electron Gas
Using a new, highly sensitive, torsional magnetometer technique, we have observed the de Haas-van Alphen Effect in GaAs/(AlGa)As two-dimensional electron systems. The measurements promise to allow direct deter...
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Chapter and Conference Paper
Quantum Hall Effect Experiments Using Ballistic Phonons
The intense interest over the last few years in the quantum Hall effect[1], occuring in the 2-D electron gas (2DEG), has been sustained largely by electronic transport measurements. For example, the prediction...
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Chapter and Conference Paper
One-Dimensional Second Sound in Superfluid Helium
In the low temperature, phonon dominated, regime the velocity of second sound in superfluid helium approaches \( {c_0}/\sqrt {3} \) ...
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Chapter
Density of States and Electron-Phonon Coupling in Two-Dimensional Electron Systems at High Magnetic Fields
One of the central problems in the two-dimensional electron field1 is the determination of the Landau level density of states. This quantity plays an essential role in determining almost all physically measurable...
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Chapter and Conference Paper
The Fractional Quantum Hall Effect at Even Denominators
The recent discovery of the fractional quantum Hall effect (FQHE) at the even—denominator filling fraction v=5/2 represents yet another surprise in the area of two-dimensional electron physics. Previous to the wo...
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Chapter and Conference Paper
Compressibility of the Interacting Two-Dimensional Electron Gas
A new technique has been employed to study the compressibility of the two-dimensional electron gas. This technique, based upon a double-layer 2D system, is typically 100 times more sensitive than the tradition...
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Chapter and Conference Paper
Evidence for Virtual Phonon Exchange Between 2-D Electron Gases
This paper reviews our study of the interaction of phonons with two-dimensional electron gases (2DEG) using a direct probe of electron-electron (e-e) scattering rates. We find evidence for an e-e scattering pr...
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Chapter and Conference Paper
Anisotropic state of two-dimensional electron gas in high Landau levels
When several Landau levels of a high mobility two-dimensional electron system are occupied, transport measurements reveal evidence for intriguing new phenomena at low temperature. Near half filling in the N=2 and...
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Article
Bose–Einstein condensation of excitons in bilayer electron systems
An exciton is the particle-like entity that forms when an electron is bound to a positively charged ‘hole’. An ordered electronic state in which excitons condense into a single quantum state was proposed as a ...
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Article
Evidence for a fractionally quantized Hall state with anisotropic longitudinal transport
In strong magnetic fields, clean two-dimensional electron systems support fractional Hall states that exhibit isotropically vanishing longitudinal resistance. At low field these states disappear and an anisotr...
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Article
Exciton condensation and perfect Coulomb drag
An electronic current flowing in one conductor can induce a drag current in another spatially separated conductor by means of Coulomb interactions; when these interactions are sufficiently strong the currents ...
