Wigner molecules in carbon-nanotube quantum dots

Article

关键词: ELECTRONIC-STRUCTURE;    FERMI-LIQUID;    STATES;    SPIN;    TRANSPORT;    BEHAVIOR;    CRYSTAL;    MOTION;   

DOI  :  10.1103/PhysRevB.82.035417

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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