Evolution of electronic structure of few-layer phosphorene from angle-resolved photoemission spectroscopy of black phosphorous

N. Ehlen,1,* B. V. Senkovskiy,1 A. V. Fedorov,1,2,3 A. Perucchi,4 P. Di Pietro,4 A. Sanna,5 G. Profeta,6 L. Petaccia,4 and A. Grüneis1,† 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany 2IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany 3St. Petersburg State University, 198504 St. Petersburg, Russia 4Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy 5Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany 6Department of Physical and Chemical Sciences and SPIN-CNR, University of L’Aquila, Via Vetoio 10, I-67100 Coppito, Italy (Received 16 August 2016; revised manuscript received 11 November 2016; published 7 December 2016)