Continuous-Time Quantum Monte Carlo Approach to Singlet–Triplet Kondo Systems
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概要
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Dynamical properties are studied numerically for a variant of the Kondo model with singlet and triplet crystalline electric field (CEF) levels where Kondo and CEF singlets compete for the ground state. Using the continuous-time quantum Monte Carlo method, we derive the $t$-matrix of conduction electrons and dynamical susceptibilities of local electrons without encountering the negative sign problem. When the CEF splitting is comparable to the Kondo temperature, the dynamical response has only a quasi-elastic peak. Nevertheless, the local single-particle spectrum shows an energy gap in strong contrast with the ordinary Kondo model.
- Physical Society of Japanの論文
- 2009-07-15
著者
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Otsuki Junya
Department Of Physics Tohoku University
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HOSHINO Shintaro
Department of Physics, Tohoku University
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Kuramoto Yoshio
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Hoshino Shintaro
Department of Physics, Tohoku University, Sendai 980-8578
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