Abstract
We observed that the propagation of a dipole domain in a GaAs/A1As superlattice can be controlled by an external high-frequency field. The doped GaAs/A1As superlattice showed a negative differential conductance giving rise to propagating dipole domains. Depending on the frequency of the high-frequency field, either frequency-locked or quasiperiodic propagating domain states occurred. The behavior can be described by a "devil's staircase," where in the locked state the ratio of the external frequency and the domain transit frequency is a rational number. A theoretical analysis indicates that the high-frequency field controls the domain propagation by a modification of both the domain velocity and the shedding of the domains from the cathode.
| Original language | English |
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| Article number | 155320 |
| Pages (from-to) | 1553201-1553207 |
| Number of pages | 7 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 65 |
| Issue number | 15 |
| Publication status | Published - 15 Apr 2002 |
| Externally published | Yes |