Intra- and inter-shell Kondo effects in carbon nanotube quantum dots
arXiv:1705.04491 · doi:10.1140/epjb/e2017-80547-y
Abstract
The linear response transport properties of carbon nanotube quantum dot in the strongly correlated regime are discussed. The finite-U mean field slave boson approach is used to study many-body effects. Magnetic field can rebuilt Kondo correlations, which are destroyed by the effect of spin-orbit interaction or valley mixing. Apart from the field induced revivals of SU(2) Kondo effects of different types: spin, valley or spin-valley, also more exotic phenomena appear, such as SU(3) Kondo effect. Threefold degeneracy occurs due to the effective intervalley exchange induced by short-range part of Coulomb interaction or due to the intershell mixing. In narrow gap nanotubes the full spin-orbital degeneracy might be recovered in the absence of magnetic field opening the condition for a formation of SU(4) Kondo resonance.
17 pages, 13 figures
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Cited by in corpus (5)
- Field-induced SU(4) to SU(2) Kondo crossover in a half-filling nanotube dot: spectral and finite-temperature properties
- Electron-phonon interaction and electronic correlations in transport through electrostatically and tunnel coupled quantum dots
- The role of spin-flip assisted or orbital mixing tunneling on transport through strongly correlated multilevel quantum dot
- Impact of electron-phonon coupling on electron transport through T-shaped arrangements of quantum dots in the Kondo regime
- Fractional shot noise of an SU(N) Kondo system