Articolo in rivista, 2022, ENG, 10.1103/PhysRevB.106.045108

One-dimensional Rashba states with unconventional spin texture in Bi chains

Sheverdyaeva, P. M.; Pacilè, D.; Topwal, D.; Manju, U.; Papagno, M.; Feyer, V.; Jugovac, M.; Zamborlini, G.; Cojocariu, I.; Tusche, C.; Tan, X. L.; Hagiwara, K.; Chen, Y. J.; Fujii, J.; Moras, P.; Ferrari, L.; Vescovo, E.; Bihlmayer, G.; Carbone, C.

Istituto di Struttura della Materia-CNR (ISM-CNR), SS 14, Km 163,5, I-34149, Trieste, Italy Dipartimento di Fisica, Università della Calabria, 87036 Arcavacata di Rende (CS), Italy Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, India CSIR - Institute of Minerals and Materials Technology, Bhubaneswar 751013, India Peter Grünberg Institut PGI, Forschungszentrum Jülich, 52425 Jülich, Germany Fakultät für Physik, Universität Duisburg-Essen, Duisburg 47057, Germany Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, S.S.14, Km 163.5, 34149 Trieste, Italy Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 00133 Roma, Italy National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

Spin-polarized electrons confined in low-dimensional structures are of high interest for spintronics applications. Here, we investigate the electronic structure of an ordered array of Bi monomer and dimer chains on the Ag(110) surface. By means of spin-resolved photoemission spectroscopy, we find Rashba-Bychkov split bands crossing the Fermi level with one-dimensional constant energy contours. These bands are up-spin polarized for positive wave vectors and down-spin polarized for negative wave vectors, at variance with the Rashba-Bychkov model that predicts a pair of states with opposite spin in each half of the surface Brillouin zone. Density functional theory shows that spin-selective hybridization with the Ag bulk bands originates this unconventional spin texture.

Physical Review B 106 (4), pp. 045108-1–045108-6

Keywords

Rashba states, Spin, Angle-resolved photoemission, low-dimensional systems

CNR authors

Jugovac Matteo, Ferrari Luisa, Carbone Carlo, Moras Paolo, Sheverdyaeva Polina, Fujii Jun

CNR institutes

ISM – Istituto di struttura della materia