Abstract
We have studied edge magnetoplasmons (EMPs) created by pulses of 100 ps width in a high-mobility two-dimensional electron gas, using a cryogenic transistor. We find that magnetoplasmon motion along the edge occurs only in the direction expected for negatively charged electrons; there is no hint of propagation in the opposite direction expected for positively charged quasiholes. We also measure the periods and decay rates of the edge modes continuously as a function of the magnetic field. From these characteristics we deduce the width of the EMP boundary layer as well as the magnetic-field- dependent momentum-relaxation time.
Original language | English (US) |
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Pages (from-to) | 3894-3897 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 45 |
Issue number | 7 |
DOIs | |
State | Published - 1992 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics