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Role of Interactions in Electronic Structure of a Two-Electron Quantum Dot Molecule |
| DONG Qing-Rui;XU Ying-Qiang;ZHANG Shi-Yong;NIU Zhi-Chuan |
| State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 |
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| Cite this article: |
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DONG Qing-Rui, XU Ying-Qiang, ZHANG Shi-Yong et al 2004 Chin. Phys. Lett. 21 2496-2499 |
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Abstract We have studied a two-electron quantum dot molecule in a magnetic field. The electron interaction is treated accurately by the direct diagonalization of the Hamiltonian matrix. We calculate two lowest energy levels of the two-electron quantum dot molecule in a magnetic field. Our results show that the electron interactions are significant, as they can change the total spin of the two-electron ground state of the system by adjusting the magnetic field between S=0 and S=1. The energy difference ΔE between the lowest S=0 and S=1 states is shown as a function of the axial magnetic field. We found that the energy difference between the lowest S=0 and S=1 states in the strong-B S=0 state varies linearly. Our results provide a possible realization for a qubit to be fabricated by current growth techniques.
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| Keywords:
71.10.-w
73.21.-b
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Published: 01 December 2004
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| PACS: |
71.10.-w
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(Theories and models of many-electron systems)
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73.21.-b
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(Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)
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