期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 74, 期 3, 页码 988-996出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.74.988
关键词
Kondo effect; Hubbard model; reservoir; Fermi liquid; quantum dot; numerical renormalization group
We study the low-energy properties of a Hubbard chain of finite size N-C connected to two noninteracting leads using the numerical renormalization group (NRG) method. The results obtained for N-C = 3 and 4 show that the low-lying eigenstates have one-to-one correspondence with the free quasiparticle excitations of a local Fermi liquid. It enables us to determine the transport coefficients from the fixed-point Hamiltonian. At half-filling, the conductance for even N-C decreases exponentially with increasing U showing a tendency towards the development of a Mott-Hubbard gap. In contrast, for odd N-C, the Fermi-liquid nature of the low-energy states assures perfect transmission through the Kondo resonance. Our formulation to deduce the conductance from the fixed-point energy levels can be applied to various types of interacting systems.
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