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Transition of the True Ground State in a Coupled Three-Layer Quantum Dot |
| ZHANG Zhan-Jun1;LI Bai-Wen1;RAO Jian-Guo1;BAO Cheng-Guang2 |
| 1Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2Department of Physics, Zhongshan University, Guangzhou 510275
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| Cite this article: |
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ZHANG Zhan-Jun, LI Bai-Wen, RAO Jian-Guo et al 2002 Chin. Phys. Lett. 19 978-980 |
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Abstract Low-lying states of a vertically coupled three-layer quantum-dot system are studied. Each layer contains one electron, and the tunnelling of electrons between layers is neglected. Effects of the interlayer separation d and the external magnetic field B are evaluated by numerical calculations. In the strong coupling case (i.e., d is small), as in a single dot, transitions of the angular momentum L of the true ground states occur when B increases, whereas in the weak coupling case the transition does not occur and the L remains zero. Furthermore, it is found that the variation of d may also induce the L-transition. As a result, a phase diagram of L of the true ground state is given in the d - B plane.
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| Keywords:
73.20.Dx
73.20.Mf
71.45.Gm
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Published: 01 July 2002
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| PACS: |
73.20.Dx
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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71.45.Gm
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(Exchange, correlation, dielectric and magnetic response functions, plasmons)
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