期刊
PHYSICAL REVIEW B
卷 82, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.035417
关键词
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资金
- MAE Italy-USA
- Fondazione Cassa di Risparmio di Modena
- INFM-CINECA
We demonstrate that electrons in quantum dots defined by electrostatic gates in semiconductor nanotubes freeze orderly in space realizing a Wigner molecule. Our exact diagonalization calculations uncover the features of the electron molecule, which may be accessed by tunneling spectroscopy-indeed some of them have already been observed by Deshpande and Bockrath [Nat. Phys. 4, 314 (2008)]. We show that numerical results are satisfactorily reproduced by a simple ansatz vibrational wave function: electrons have localized wave functions, like nuclei in an ordinary molecule, whereas low-energy excitations are collective vibrations of electrons around their equilibrium positions.
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