TY  - JOUR
A1  - El-Kareh, Lydia
A1  - Bihlmayer, Gustav
A1  - Buchter, Arne
A1  - Bentmann, Hendrik
A1  - Blügel, Stefan
A1  - Reinert, Friedrich
A1  - Bode, Matthias
T1  - A combined experimental and theoretical study of Rashba-split surface states on the ( √3x√3) Pb/Ag (111)R30° surface
N2  - We report on a combined low-temperature scanning tunneling spectroscopy (STS), angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) investigation of the ( √3x√3) Pb/Ag (111)R30° surface alloy which provides a giant Rashba-type spin splitting. With STS we observed spectroscopic features that are assigned to two hole-like Rashba-split bands in the unoccupied energy range. By means of STS and quantum interference mapping we determine the band onsets, splitting strengths, and dispersions for both bands. The unambiguous assignment of scattering vectors is achieved by comparison to ARPES measurements. While intra-band scattering is found for both Rashba bands, inter-band scattering is only observed in the occupied energy range. Spin- and orbitally-resolved band structures were obtained by DFT calculations. Considering the scattering between states of different spin- and orbital character, the apparent deviation between experimentally observed scattering events and the theoretically predicted spin polarization could be resolved.
KW  - Rashba effect
KW  - spin–orbit coupling
KW  - scanning tunneling microscopy
KW  - angle resolved photo emission spectroscopy
KW  - density functional theory
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-112786
ER  - 
TY  - JOUR
A1  - Schmitt, Martin
A1  - Moras, Paolo
A1  - Bihlmayer, Gustav
A1  - Cotsakis, Ryan
A1  - Vogt, Matthias
A1  - Kemmer, Jeannette
A1  - Belabbes, Abderrezak
A1  - Sheverdyaeva, Polina M.
A1  - Kundu, Asish K.
A1  - Carbone, Carlo
A1  - Blügel, Stefan
A1  - Bode, Matthias
T1  - Indirect chiral magnetic exchange through Dzyaloshinskii–Moriya-enhanced RKKY interactions in manganese oxide chains on Ir(100)
JF  - Nature Communications
N2  - Localized electron spins can couple magnetically via the Ruderman–Kittel–Kasuya–Yosida interaction even if their wave functions lack direct overlap. Theory predicts that spin–orbit scattering leads to a Dzyaloshinskii–Moriya type enhancement of this indirect exchange interaction, giving rise to chiral exchange terms. Here we present a combined spin-polarized scanning tunneling microscopy, angle-resolved photoemission, and density functional theory study of MnO2 chains on Ir(100). Whereas we find antiferromagnetic Mn–Mn coupling along the chain, the inter-chain coupling across the non-magnetic Ir substrate turns out to be chiral with a 120° rotation between adjacent MnO2 chains. Calculations reveal that the Dzyaloshinskii–Moriya interaction results in spin spirals with a periodicity in agreement with experiment. Our findings confirm the existence of indirect chiral magnetic exchange, potentially giving rise to exotic phenomena, such as chiral spin-liquid states in spin ice systems or the emergence of new quasiparticles.
KW  - magnetic properties and materials
KW  - surfaces, interfaces and thin films
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-230986
VL  - 10
ER  -