期刊
PHYSICAL REVIEW B
卷 81, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.075437
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资金
- EPSRC (U.K.) [EP/D050952/1]
- UK National Grid Service
- DFG (Germany) [AN 275/6-1]
- Engineering and Physical Sciences Research Council [EP/D050952/1] Funding Source: researchfish
- EPSRC [EP/D050952/1] Funding Source: UKRI
We investigate the influence of spin-orbit coupling on the Kondo effects in carbon nanotube quantum dots, using the numerical renormalization group technique. A sufficiently large spin-orbit coupling is shown to destroy the SU(4) Kondo effects at zero magnetic field, leaving only two SU(2) Kondo effects in the one-and three-electron Coulomb-blockade valleys. On applying a finite magnetic field, two additional, spin-orbit induced SU(2) Kondo effects arise in the three-and two-electron valleys. Using physically realistic model parameters, we calculate the differential conductance over a range of gate voltages, temperatures, and fields. The results agree well with measurements from two different experimental devices in the literature, and explain a number of observations that are not described within the standard framework of the SU(4) Anderson impurity model.
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