Intersection and anticrossing of far-infrared modes in elliptical quantum dots with tunable ellipticity

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Erscheinungsjahr:
2000
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  • We have investigated elliptically shaped quantum dots in modulation-doped AlxGa1−x As−GaAs heterostructures with far-infrared spectroscopy. We observe series of modes Ω + i and Ω− i which increase in frequency with increasing mode index i. The frequencies Ω+ i and Ω− i at a given i represent, at a magnetic field B=0, oscillations along the short and long axes of the dot, respectively. With a gate voltage we can vary the ellipticity of the dot; in particular, we can tune the Ω− 2 mode through the Ω+ 1 mode. This leads to an interesting mode intersection and, at B > 0, to an anticrossing behavior. © 2000 The American Physical Society.
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  • info:eu-repo/semantics/closedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/c859e71c-e5d4-4222-a039-0ecec0a27301