Hybrid stable-chaotic states in coupled quantum well stadia
| Autor: | Christopher R. Tench, T. M. Fromhold, N. Miura, Mohamed Henini, F.W. Sheard, G. Hill, P. B. Wilkinson, R.K. Hayden, P. M. Martin, Laurence Eaves |
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| Rok vydání: | 1998 |
| Předmět: |
Physics
Chaotic Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Atomic and Molecular Physics and Optics Quantum chaos Electronic Optical and Magnetic Materials Magnetic field Quantum state Tunnel junction Rectangular potential barrier Atomic physics Quantum well |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1386-9477 |
| DOI: | 10.1016/s1386-9477(98)00060-5 |
| Popis: | We use tunnel current spectroscopy to investigate the quantum states of two GaAs quantum wells coupled by a low (100 meV) (AlGa)As tunnel barrier. A high tilted magnetic field is used to generate strongly chaotic electron motion in the two wells which act as coupled chaotic `stadia'. The effect of the tunnel barrier on the dynamics of the system depends on the magnitude of the applied bias voltage V. For V≳375 mV, the central potential barrier acts as a perturbation which modifies the trajectories of selected periodic orbits in the quantum well. Scattering off the central barrier also generates new periodic orbits involving multiple collisions on all three barriers. These orbits `scar' distinct sets of eigenstates which generate periodic resonant peaks in the current–voltage characteristics of the device. When the device is biased such that the injected electrons just surmount the central barrier, our calculations reveal novel hybrid scarred states with both stable and chaotic characteristics. |
| Databáze: | OpenAIRE |
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