Magnetic response of energy levels of superconducting nanoparticles with spin-orbit scattering - Archive ouverte HAL Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2015

Magnetic response of energy levels of superconducting nanoparticles with spin-orbit scattering

(1, 2) , (1)
1
2

Abstract

Discrete energy levels of ultrasmall metallic grains are extracted in single-electron tunneling spectroscopy experiments. We study the response of these energy levels to an external magnetic field in the presence of both spin-orbit scattering and pairing correlations. In particular, we investigate g factors and level curvatures that parametrize, respectively, the linear and quadratic terms in the magnetic-field dependence of the many-particle energy levels of the grain. Both of these quantities exhibit level-to-level fluctuations in the presence of spin-orbit scattering. We show that the distribution of g factors is not affected by the pairing interaction and that the distribution of level curvatures is sensitive to pairing correlations even in the smallest grains in which the pairing gap is smaller than the mean single-particle level spacing. We propose the level curvature in a magnetic field as a tool to probe pairing correlations in tunneling spectroscopy experiments.

Dates and versions

cea-01734597 , version 1 (14-03-2018)

Identifiers

Cite

Konstantin N. Nesterov, Y. Alhassid. Magnetic response of energy levels of superconducting nanoparticles with spin-orbit scattering. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (14), pp.144508. ⟨10.1103/PhysRevB.92.144508⟩. ⟨cea-01734597⟩
25 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More