Article
Robust spin polarization and spin textures on stepped Au(111) surfaces.
Centre d'Investigaciò en Nanociència i Nanotecnologia, CIN2 (CSICICN), Esfera UAB, Campus de Bellaterra, 08193Barcelona, Spain.
Physical Review Letters (Impact Factor: 7.73). 05/2010; 104(18):187602. DOI: 10.1103/PhysRevLett.104.187602 Source: PubMed

Article: Direct observation of the spin texture in SmB6 as evidence of the topological Kondo insulator.
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ABSTRACT: Topological Kondo insulators have been proposed as a new class of topological insulators in which nontrivial surface states reside in the bulk Kondo band gap at low temperature due to strong spinorbit coupling. In contrast to other threedimensional topological insulators, a topological Kondo insulator is truly bulk insulating. Furthermore, strong electron correlations are present in the system, which may interact with the novel topological phase. By applying spin and angleresolved photoemission spectroscopy, here we show that the surface states of SmB6 are spin polarized. The spin is locked to the crystal momentum, fulfilling time reversal and crystal symmetries. Our results provide strong evidence that SmB6 can host topological surface states in a bulk insulating gap stemming from the Kondo effect, which can serve as an ideal platform for investigating of the interplay between novel topological quantum states with emergent effects and competing orders induced by strongly correlated electrons.Nature Communications 07/2014; 5:4566. · 10.74 Impact Factor 
Article: Weak localization in a lateral superlattice with Rashba and Dresselhaus spinorbit interaction
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ABSTRACT: We calculate the weak localization (WL) correction to the conductivity of a lateral superlattice (LSL) with Rashba (R)Dresselhaus (D) spinorbit interaction (SOI). The superlattice is modeled as a sequence of parallel wires that support tunneling between adjacent sites, leading to the formation of extended Bloch states along its axis and a miniband in the energy spectrum. Our results, obtained by calculating the eigenvalues of the Cooperon operator in the diffusion approximation, indicate that the electron dephasing rate that determines the antilocalization correction is enhanced by a term proportional with the LSL potential and the bandwidth. Within the same formalism, the spinrelaxation rates associated with the localization corrections are found to exhibit a strong anisotropy dictated by the relative strength of the two SOI couplings, as well as by the orientation of the LSL axis.Physical review. B, Condensed matter 04/2012; 85(16). · 3.66 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The mutual interplay between superlattice structures, band filling factors, and spinorbit coupling results in a highly correlated electronic spin and charge state found for an array of atomic Pb wires grown on Si(557). By means of spin and angleresolved photoemission spectroscopy, the spin texture close to the Fermi surface was found to be alternating and equidistant; thus, Fermi nesting occurs in between bands with the same spin helicity, giving rise to spinpolarized chargedensity waves in the direction across the wires. An outofphase superposition of both Rashba channels is manifested by an extraordinary large Rashba splitting of Δk_{0}=0.2 Å^{1}=g/2, where g is a reciprocal lattice vector defined by the interwire distance and fits into the model of spindensity waves in antiferromagnetically ordered chain structures. The implications towards spinpolarized transport along the wires will be discussed.Physical Review Letters 12/2012; 109(26):266401. · 7.73 Impact Factor
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