Diagonal composite order in a two-channel Kondo lattice

Shintaro Hoshino, Junya Otsuki, Yoshio Kuramoto

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A novel type of symmetry breaking is reported for the two-channel Kondo lattice where conduction electrons have spin and orbital (channel) degrees of freedom. Using the continuous-time quantum Monte Carlo and the dynamical mean-field theory, a spontaneous breaking of the orbital symmetry is observed. The tiny breakdown of orbital occupation number, however, vanishes if the conduction electrons have the particle-hole symmetry. The proper order parameter instead is identified as a composite quantity representing the orbital-selective Kondo effect. The single-particle spectrum of the selected orbital shows insulating property, while the other orbital behaves as a Fermi liquid. This composite order is the first example of odd-frequency order other than off-diagonal order (superconductivity), and is a candidate of hidden order in f-electron systems.

Original languageEnglish
Article number247202
JournalPhysical Review Letters
Volume107
Issue number24
DOIs
Publication statusPublished - Dec 7 2011
Externally publishedYes

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orbitals
composite materials
conduction electrons
electron orbitals
Kondo effect
symmetry
Fermi liquids
electron spin
occupation
broken symmetry
superconductivity
degrees of freedom
breakdown
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Diagonal composite order in a two-channel Kondo lattice. / Hoshino, Shintaro; Otsuki, Junya; Kuramoto, Yoshio.

In: Physical Review Letters, Vol. 107, No. 24, 247202, 07.12.2011.

Research output: Contribution to journalArticle

Hoshino, Shintaro ; Otsuki, Junya ; Kuramoto, Yoshio. / Diagonal composite order in a two-channel Kondo lattice. In: Physical Review Letters. 2011 ; Vol. 107, No. 24.
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