Few-electron physics in a nanotube quantum dot with spin-orbit coupling
arXiv:0904.0445 · doi:10.1103/PhysRevB.79.235408
Abstract
We study the few-electron eigenspectrum of a nanotube quantum dot with spin-orbit coupling. The two-electron phase diagram as a function of the length of the dot and the applied parallel magnetic field shows clear signatures of both spin-orbit coupling and electron-electron interaction. Below a certain critical length, ground state transitions are correctly predicted by a single-particle picture and are mainly independent of the length of the dot despite the presence of strong correlations. However, for longer quantum dots the critical magnetic field strongly decreases with increasing length, which is a pure interaction effect. In fact, the new ground state is spin- and valley-polarized, which implies a strong occupation of higher longitudinal modes.
6 pages, 6 figures, Minor changes with respect to first version, slightly modified value of spin-orbit coupling
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Cited by in corpus (27)
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- A valley-spin qubit in a carbon nanotube
- Imaging the Wigner Crystal of Electrons in One Dimension
- Valley-spin blockade and spin resonance in carbon nanotubes
- Observation and Spectroscopy of a Two-Electron Wigner Molecule in an Ultra-Clean Carbon Nanotube
- Carbon nanotubes for coherent spintronic devices
- Coulomb versus spin-orbit interaction in few-electron carbon-nanotube quantum dots
- Hyperfine-induced valley mixing and the spin-valley blockade in carbon-based quantum dots
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- Interplay between Kondo physics and spin-orbit coupling in carbon nanotube quantum dots
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- Current hot spot in the spin-valley blockade in carbon nanotubes
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