Aharonov-Bohm/Casher effect in a Kondo ring

H. P. Eckle, H. Johannesson, Charles A Stafford

Research output: Contribution to journalArticle

Abstract

The influence of a magnetic impurity or ultrasmall quantum dot on the spin and charge persistent currents of a mesoscopic ring is investigated. The system consists of electrons in a one-dimensional ring threaded by spin-dependent Aharonov-Bohm/Casher fluxes, and coupled via an antiferromagnetic exchange interaction to a localized electron. The problem is mapped onto a Kondo model for the even-parity channel plus free electrons in the odd-parity channel. The twisted boundary conditions representing the fluxes couple states of opposite parity unless the twist angles φ + α satisfy φ + α = f απ, where f α are integers, with spin index α = ↑, ↓,. For these special values of φ + α, the model is solvable by the Bethe ansatz.

Original languageEnglish (US)
Pages (from-to)1872-1873
Number of pages2
JournalPhysica B: Condensed Matter
Volume284-288
Issue numberPART II
Publication statusPublished - 2000

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Keywords

  • Bethe ansatz
  • Kondo effect
  • Persistent current
  • Quantum dots

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Eckle, H. P., Johannesson, H., & Stafford, C. A. (2000). Aharonov-Bohm/Casher effect in a Kondo ring. Physica B: Condensed Matter, 284-288(PART II), 1872-1873.