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】
Free