Spin‐orbit scattering in superconducting nanoparticles

Alhassid, Y.; Nesterov, K. N.

doi:10.1002/prop.201600099

Title: Spin‐orbit scattering in superconducting nanoparticles

Journal Article · Wed Dec 21 00:00:00 EST 2016 · Fortschritte der Physik

DOI:https://doi.org/10.1002/prop.201600099· OSTI ID:1400806

Alhassid, Y. ^[1]; Nesterov, K. N. ^[2]

Center for Theoretical Physics, Sloane Physics Laboratory Yale University New Haven Connecticut 06520 USA
Department of Physics University of Wisconsin‐Madison Madison Wisconsin 53706 USA

We review interaction effects in chaotic metallic nanoparticles. Their single‐particle Hamiltonian is described by the proper random‐matrix ensemble while the dominant interaction terms are invariants under a change of the single‐particle basis. In the absence of spin‐orbit scattering, the nontrivial invariants consist of a pairing interaction, which leads to superconductivity in the bulk, and a ferromagnetic exchange interaction. Spin‐orbit scattering breaks spin‐rotation invariance and when it is sufficiently strong, the only dominant nontrivial interaction is the pairing interaction. We discuss how the magnetic response of discrete energy levels of the nanoparticle (which can be measured in single‐electron tunneling spectroscopy experiments) is affected by such pairing correlations and how it can provide a signature of pairing correlations. We also consider the spin susceptibility of the nanoparticle and discuss how spin‐orbit scattering changes the signatures of pairing correlations in this observable.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐FG02‐91ER40608

OSTI ID:: 1400806

Journal Information:: Fortschritte der Physik, Journal Name: Fortschritte der Physik Vol. 65 Journal Issue: 6-8; ISSN 0015-8208

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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