TY - CHAP
T1 - Spintronics in quantum dots
T2 - Kondo effect in quantum dots with two orbitals and spin 1/2 - Crossover from SU(4) to SU(2) symmetry
AU - Eto, Mikio
PY - 2005/1/1
Y1 - 2005/1/1
N2 - Kondo effect is theoretically studied in quantum dots with two orbitals and spin 1/2. We evaluate the Kondo temperature TKas a function of energy difference Δ between the orbitals using the scaling method. We find that TKis maximal around the degeneracy point (Δ = 0) and decreases with increasing |Δ| by a power law. This behavior of TKis understood as a crossover from SU(4) to SU(2) Kondo effect. The calculated results agree with recent experimental results.
AB - Kondo effect is theoretically studied in quantum dots with two orbitals and spin 1/2. We evaluate the Kondo temperature TKas a function of energy difference Δ between the orbitals using the scaling method. We find that TKis maximal around the degeneracy point (Δ = 0) and decreases with increasing |Δ| by a power law. This behavior of TKis understood as a crossover from SU(4) to SU(2) Kondo effect. The calculated results agree with recent experimental results.
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U2 - 10.1142/9789812701619_0070
DO - 10.1142/9789812701619_0070
M3 - Chapter
AN - SCOPUS:84967538025
SN - 9789812701619
SN - 9789812564689
SP - 451
EP - 456
BT - Realizing Controllable Quantum States: Mesoscopic Superconductivity and Spintronics - In the Light of Quantum Computation
PB - World Scientific Publishing Co.
ER -