dc.contributor.author
Sukhachov, P. O.
dc.contributor.author
Oppen, Felix von
dc.contributor.author
Glazman, L. I.
dc.date.accessioned
2024-03-14T12:56:39Z
dc.date.available
2024-03-14T12:56:39Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/42576
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-42300
dc.description.abstract
We investigate the role of the Bloch functions and superconducting gap symmetries on the formation and properties of impurity-induced resonances in a two-dimensional superconductor, and elucidate their manifestation in scanning tunneling spectra. We use and extend a recently developed scattering approach, conveniently formulating the results in terms of the phase shifts of electron scattering off the impurity. We find that the discrete subgap states in a nodeless-gap superconductor are insensitive to the potential scattering phase shift (common for the two spin species) if time-reversal symmetry (TRS) is preserved. The independence of potential scattering is exact for s-wave superconductors. It remains an accurate approximation over a broad range of subgap energies when the gap function breaks the lattice point symmetry, except for a narrow region below the gap edge. Breaking of TRS makes potential scattering capable of creating spin-degenerate subgap states, which may be further split by spin-dependent scattering. In nodal-gap superconductors, impurity-induced resonances are broadened by coupling to the quasiparticle continuum. We identify the conditions allowing for the formation of narrow resonances. In addition to finding the energy spectrum, we evaluate the spin-resolved differential conductance for all of the considered symmetries and gap structures.
en
dc.format.extent
18 Seiten (Manuskriptversion)
dc.rights.uri
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen
dc.subject
Andreev reflection
en
dc.subject
Bound states
en
dc.subject
Scattering amplitudes
en
dc.subject
Superconducting gap
en
dc.subject
Superconductivity
en
dc.subject
Disordered systems
en
dc.subject
Tunnel junctions
en
dc.subject
Unconventional superconductors
en
dc.subject
Methods in superconductivity
en
dc.subject
S-matrix method in transport
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik
dc.title
Tunneling spectra of impurity states in unconventional superconductors
dc.type
Wissenschaftlicher Artikel
dc.identifier.sepid
97252
dcterms.bibliographicCitation.articlenumber
024505
dcterms.bibliographicCitation.doi
10.1103/PhysRevB.108.024505
dcterms.bibliographicCitation.journaltitle
Physical Review B
dcterms.bibliographicCitation.number
2
dcterms.bibliographicCitation.originalpublishername
APS
dcterms.bibliographicCitation.originalpublisherplace
College Park, MD
dcterms.bibliographicCitation.volume
108 (2023)
dcterms.bibliographicCitation.url
https://link.aps.org/doi/10.1103/PhysRevB.108.024505
dcterms.rightsHolder.url
https://journals.aps.org/authors/editorial-policies-open-access#pub-rights
refubium.affiliation
Physik
refubium.affiliation.other
Institut für Theoretische Physik
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refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.issn
2469-9950
dcterms.isPartOf.eissn
2469-9969