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복잡계 이론물리 연구단
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Nonlinear entangled quantum dynamics in many-body systems with strong electron correlation

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Title
Nonlinear entangled quantum dynamics in many-body systems with strong electron correlation
Author(s)
Jongbae Hong
Publication Date
2017-04
Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS B, v.31, no.10, pp.1742009-1 - 1742009-22
Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
Abstract
A quantum impurity system out of equilibrium comprises two metallic reservoirs with dierent chemical potentials and one mediating spin impurity between them. We study the highly nonlinear tunneling conductance of this system, and clarify that three coherent peaks, one zero-bias peak and two side peaks, naturally appear in the tunneling conductance. We use the Liouvillian approach, in which a complete set of basis operators is available, and construct a Liouville matrix to obtain Green's function at the mediating site. We show that the two coherent side peaks are the outcome of steady-state nonequilibrium combined with strong electron correlation at the mediating site. Tunneling in the quantum impurity system out of equilibrium is performed by an entangled state which is a linear combination of two Kondo singlets formed by the spin at the mediating site and the coherent spins in each reservoir. The uctuation by incoherent spins is also included. The spectral weights and positions of the three coherent peaks are analytically discussed via atomic limit analysis. Our theoretical results well t experimental data obtained for quantum point contacts with symmetric and asymmetric Kondo couplings. (c) World Scientic Publishing Company
URI
https://pr.ibs.re.kr/handle/8788114/3434
ISSN
0217-9792
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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