SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum Dots
A. Makarovski, A. Zhukov, J. Liu, G. Finkelstein
TL;DR
This paper investigates the SU(4) and SU(2) Kondo effects in carbon nanotube quantum dots, revealing how magnetic fields influence the Kondo states for different electron configurations and orientations.
Contribution
It provides experimental insights into how magnetic fields affect SU(4) and SU(2) Kondo effects in nanotube quantum dots, highlighting the conditions for their emergence and suppression.
Findings
SU(4) Kondo effect observed in specific electron shells.
Magnetic field quenches two-electron Kondo state.
Different Kondo states survive depending on magnetic field orientation.
Abstract
We study the SU(4) Kondo effect in carbon nanotube quantum dots, where doubly degenerate orbitals form 4-electron ``shells''. The SU(4) Kondo behavior is investigated for one, two and three electrons in the topmost shell. While the Kondo state of two electrons is quenched by magnetic field, in case of an odd number of electrons two types of SU(2) Kondo effect may survive. Namely, the spin SU(2) state is realized in the magnetic field parallel to the nanotube (inducing primarily orbital splitting). Application of the perpendicular field (inducing Zeeman splitting) results in the orbital SU(2) Kondo effect.
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