Abstract
By probing the low-disorder two-dimensional electron system at submicron dimensions, important new length scales are revealed. Using surface acoustic waves of wavelength λ ≲ 1 μm to measure the 2D electron conductivity, enhanced conductivity is observed at even-denominator filling factors v = 1/2, 1/4: this represents measurement of composite fermions' conductivity at a dimension smaller than the quasiparticles' mean free path. At smaller λ we are able to observe geometric resonance of the composite fermions' cyclotron orbit and the ultrasound wavelength. Observation of this resonance allows measurement of the composite fermion Fermi wave vector.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1-4 |
| Number of pages | 4 |
| Journal | Physica B: Condensed Matter |
| Volume | 219-220 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - Apr 1 1996 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
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