| Zugriffsnummer | 11228 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Relaxation oscillations in a bistable quantum Hall system |
| Autor(in); Institution |
Buß, André; TU Braunschweig, Institut für Technische Physik, Braunschweig, GERMANY
Nachtwei, G.; TU Braunschweig, Institut für Technische Physik, Braunschweig, GERMANY
Kalugin, N. G.; TU Braunschweig, Institut für Technische Physik, Braunschweig, GERMANY
Sagol, B. Erol; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig; TU Braunschweig, Institut für Technische Physik, Braunschweig, GERMANY
Stellmach, C.; TU Braunschweig, Institut für Technische Physik, Braunschweig, GERMANY
Hirsch, A.; TU Braunschweig, Institut für Technische Physik, Braunschweig, GERMANY
Hein, Günter; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig
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| Quelle/Jahr | Semiconductor Science and Technology: 19 (2004), 4, S40 - S42 |
| ISSN | 0268-1242 |
| URL | |
| Verlag | Bristol: Institute of Physics Publishing Ltd |
| Zusammenfassung | Quantum Hall systems can show a bistability in the hysteresis of the breakdown. We realized a relaxation oscillator based on a quantum-Hall device with Corbino geometry. Investigations of the performance of such an oscillator revealed an increase of the hysteresis of the current-voltage curve of the device in comparison with the width of hysteresis at dc voltages. By direct measurements of the hysteresis of the current-voltage curve at different frequencies, we found a marked increase of the breakdown hysteresis at low frequencies of some Hz. We explain the observed dynamical enhancement of the breakdown hysteresis applying an electron heating model with a background (delocalization-related) component of conductivity, which decreases with increasing frequency, indicating a more effective localization already at low frequencies. |
