Macroscopic Quantum Entanglement of a Kondo Cloud at Finite Temperature

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We propose a variational approach for computing the macroscopic entanglement in a many-body mixed state, based on entanglement witness operators, and compute the entanglement of formation (EoF), a mixed-state generalization of the entanglement entropy, in single- and two-channel Kondo systems at finite temperature. The thermal suppression of the EoF obeys power-law scaling at low temperature. The scaling exponent is halved from the single- to the two-channel system, which is attributed, using a bosonization method, to the non-Fermi liquid behavior of a Majorana fermion, a "half" of a complex fermion, emerging in the two-channel system. Moreover, the EoF characterizes the size and power-law tail of the Kondo screening cloud of the single- channel system.
Publisher
AMER PHYSICAL SOC
Issue Date
2015-02
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.114, no.5

ISSN
0031-9007
DOI
10.1103/PhysRevLett.114.057203
URI
http://hdl.handle.net/10203/195524
Appears in Collection
PH-Journal Papers(저널논문)
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