Yao, NormanMoca, C. P.Weymann, I.Sau, J. D.Lukin, MikhailDemler, EugeneZaránd, G.2015-07-022014Yao, 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.90.241108.1098-0121http://nrs.harvard.edu/urn-3:HUL.InstRepos:16953020We 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.en-USJournal Article2015-07-0210.1103/PhysRevB.90.241108