NRG Approach to the Transport through a Finite Hubbard Chain Connected to Reservoirs(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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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.
- 社団法人日本物理学会の論文
- 2005-03-15
著者
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Oguri Akira
Department Of Material Science Osaka City University
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Oguri Akira
Department Of Applied Physics Nagoya University
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Hewson A.c.
Department Of Mathematics Imperial College
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