Publication: Phase diagram and excitations of a Shiba molecule
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Date
2014
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American Physical Society (APS)
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Yao, N. Y., C. P. Moca, I. Weymann, J. D. Sau, M. D. Lukin, E. A. Demler, and G. Zaránd. 2014. “Phase Diagram and Excitations of a Shiba Molecule.” Phys. Rev. B 90 (24) (December). doi:10.1103/physrevb.90.241108.
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Abstract
We analyze the phase diagram associated with a pair of magnetic impurities trapped in a superconducting host. The natural interplay between Kondo screening, superconductivity, and exchange interactions leads to a rich array of competing phases, whose transitions are characterized by discontinuous changes of the total spin. Our analysis is based on a combination of numerical renormalization group techniques as well as semiclassical analytics. In addition to the expected screened and unscreened phases, we observe a new molecular doublet phase where the impurity spins are only partially screened by a single extended quasiparticle. Direct signatures of the various Shiba molecule states can be observed via radio-frequency spectroscopy.
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