Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-07-23
Physical Review Letters 101, 246805 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
published version, 5 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.101.246805
Motivated by recent experimental observation of spin-orbit coupling in carbon nanotube quantum dots [F. Kuemmeth \textsl{et al.}, Nature (London) {\bf 452}, 448 (2008)], we investigate in detail its influence on the Kondo effect. The spin-orbit coupling intrinsically lifts out the fourfold degeneracy of a single electron in the dot, thereby breaking the SU(4) symmetry and splitting the Kondo resonance even at zero magnetic field. When the field is applied, the Kondo resonance further splits and exhibits fine multipeak structures resulting from the interplay of spin-orbit coupling and Zeeman effect. A microscopic cotunneling process for each peak can be uniquely identified. Finally, a purely orbital Kondo effect in the two-electron regime is also obtained.
Fang Tie-Feng
Luo Hong-Gang
Zuo Wei
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