TY - JOUR
T1 - Towards two-channel Kondo effect in triple quantum dot
AU - Kyzmenko, T.
AU - Kikoin, K.
AU - Avishai, Y.
PY - 2003/10/1
Y1 - 2003/10/1
N2 - The effective spin Hamiltonian of a triple quantum dot with odd electron occupation weakly connected in series with left (l) and right (r) metal leads is composed of two-channel exchange and co-tunneling terms. Renormalization group equations for the corresponding three exchange constants Jl, Jr and Jlr are solved (to third order). Since J lr is relevant, the system is mapped on an anisotropic two-channel Kondo problem. The structure of the conductance as a function of temperature and gate voltage implies that in the weak- and intermediate-coupling regimes, two-channel Kondo physics persists at temperatures as low as several T K. At even electron occupation, the number of channels equals twice the spin of the triple dot (hence it is a fully screened impurity).
AB - The effective spin Hamiltonian of a triple quantum dot with odd electron occupation weakly connected in series with left (l) and right (r) metal leads is composed of two-channel exchange and co-tunneling terms. Renormalization group equations for the corresponding three exchange constants Jl, Jr and Jlr are solved (to third order). Since J lr is relevant, the system is mapped on an anisotropic two-channel Kondo problem. The structure of the conductance as a function of temperature and gate voltage implies that in the weak- and intermediate-coupling regimes, two-channel Kondo physics persists at temperatures as low as several T K. At even electron occupation, the number of channels equals twice the spin of the triple dot (hence it is a fully screened impurity).
UR - http://www.scopus.com/inward/record.url?scp=0142230910&partnerID=8YFLogxK
U2 - 10.1209/epl/i2003-00296-0
DO - 10.1209/epl/i2003-00296-0
M3 - Article
AN - SCOPUS:0142230910
SN - 0295-5075
VL - 64
SP - 218
EP - 224
JO - Journal de Physique (Paris), Lettres
JF - Journal de Physique (Paris), Lettres
IS - 2
ER -