Large Tunable Rashba Spin Splitting of a Two-Dimensional Electron Gas in Bi₂Se₃

P. D. C. King¹, R. C. Hatch², M. Bianchi², R. Ovsyannikov³, C. Lupulescu^3,4, G. Landolt^5,6, B. Slomski^5,6, J. H. Dil^5,6, D. Guan^2,7, J. L. Mi⁸, E. D. L. Rienks³, J. Fink^3,9, A. Lindblad¹⁰, S. Svensson^10,11, S. Bao⁷, G. Balakrishnan¹², B. B. Iversen⁸, J. Osterwalder⁵, W. Eberhardt^3,4, F. Baumberger¹, and Ph. Hofmann^2,*
1School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom
²Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark
³Helmholtz-Zentrum Berlin, Elektronenspeicherring BESSY II, D-12489 Berlin, Germany
⁴Technische Universität Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
⁵Physik-Institut, Winterthurerstr. 190, Universitat Zürich-Irchel, 8057 Zürich, Switzerland
⁶Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
⁷Department of Physics, Zhejiang University, Hangzhou 310027 China
⁸Center for Materials Crystallography, Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
⁹Leibniz-Institute for Solid State and Materials Research Dresden, P.O. Box 270116, D-01171 Dresden, Germany
¹⁰MAX-lab, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
¹¹Department of Physics and Astronomy, Uppsala University, P.O. Box 521, SE-75121 Uppsala, Sweden
¹²Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

^*philip@phys.au.dk