Enlarged magnetic focusing radius of photoinduced ballistic currents
arXiv:1201.3333 · doi:10.1103/PhysRevB.86.115315
Abstract
We exploit GaAs-based quantum point contacts as mesoscopic detectors to analyze the ballistic flow of photogenerated electrons in a two-dimensional electron gas at a perpendicular magnetic field. Whereas charge transport experiments always measure the classical cyclotron radius, we show that this changes dramatically when detecting the photoinduced non-equilibrium current in magnetic fields. The experimentally determined radius of the trajectories surprisingly exceeds the classical cyclotron value by far. Monte Carlo simulations suggest electron-electron scattering as the underlying reason.
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References in corpus (10)
- Imaging Magnetic Focusing of Coherent Electron Waves
- Unexpected features of branched flow through high-mobility two-dimensional electron gases
- Electron interferometer formed with a scanning probe tip and quantum point contact
- Imaging Electron Interferometer
- Relaxation of hot electrons in a degenerate two-dimensional electron system: transition to one-dimensional scattering
- Spatially probed electron-electron scattering in a two-dimensional electron gas
- Cyclotron motion and magnetic focusing in semiconductor quantum wells with spin-orbit coupling
- Phonon-mediated non-equilibrium interaction between nanoscale devices
- Dynamic photoconductive gain effect in shallow-etched AlGaAs/GaAs quantum wires
- Imaging electrons in a magnetic field