Cotunneling renormalization in carbon nanotube quantum dots

TY - JOUR

T1 - Cotunneling renormalization in carbon nanotube quantum dots

AU - Kirsanskas, Gediminas

AU - Paaske, Jens

AU - Flensberg, Karsten

N1 - [QDev]

PY - 2012/8/23

Y1 - 2012/8/23

N2 - We determine the level shifts induced by cotunneling in a Coulomb blockaded carbon nanotube quantum dot using leading-order quasidegenerate perturbation theory within a single nanotube "shell." It is demonstrated that otherwise degenerate and equally tunnel coupled K and K ′ states are mixed by cotunneling and therefore split up in energy except at the particle-hole-symmetric midpoints of the Coulomb diamonds. In the presence of an external magnetic field, we show that cotunneling induces a gate dependent g-factor renormalization, and we outline different scenarios which might be observed experimentally, depending on the values of both intrinsic K-K ′ mixing and spin-orbit coupling.

AB - We determine the level shifts induced by cotunneling in a Coulomb blockaded carbon nanotube quantum dot using leading-order quasidegenerate perturbation theory within a single nanotube "shell." It is demonstrated that otherwise degenerate and equally tunnel coupled K and K ′ states are mixed by cotunneling and therefore split up in energy except at the particle-hole-symmetric midpoints of the Coulomb diamonds. In the presence of an external magnetic field, we show that cotunneling induces a gate dependent g-factor renormalization, and we outline different scenarios which might be observed experimentally, depending on the values of both intrinsic K-K ′ mixing and spin-orbit coupling.

U2 - 10.1103/PhysRevB.86.075452

DO - 10.1103/PhysRevB.86.075452

M3 - Journal article

SN - 2469-9950

VL - 86

SP - 075452

JO - Physical Review B

JF - Physical Review B

IS - 7

ER -