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DS: Fachverband Dünne Schichten

DS 30: Two-dimensional materials IV (jointly with HL/TT)

DS 30.13: Vortrag

Mittwoch, 22. März 2017, 13:00–13:15, POT 51

Evolution of electronic structure of few-layer phosphorene from angle-resolved photoemission spectroscopy of black phosphorous — •Niels Ehlen¹, Boris Senkovskiy¹, Alexander Fedorov^1,2,3, Andrea Perucchi⁴, Paola Di Pietro⁴, Antonio Sanna⁵, Gianni Profeta⁶, Luca Petaccia⁴, and Alexander Grüneis¹ — ¹Institute of Physics II, University of Cologne, Germany — ²IFW Dresden, Germany — ³St. Petersburg State University, Russia — ⁴Elettra Sincrotrone Trieste, Italy — ⁵Max Planck Institute of Microstructure Physics, Halle, Germany — ⁶Department of Physical and Chemical Sciences/SPIN-CNR, University of L’Aquila, Italy

A complete set of tight-binding parameters for the description of the quasiparticle dispersion relations of black phosphorous (BP) and N-layer phosphorene with N=1…∞ is presented. The parameters, which describe valence and conduction bands, are fit to angle-resolved photoemission spectrocopy (ARPES) data of pristine and lithium doped BP. We show that zone-folding of the experimental three-dimensional electronic band structure of BP is a simple and intuitive method to obtain the layer-dependent two-dimensional electronic structure of few-layer phosphorene. Zone-folding yields the band gap of N-layer phosphorene in excellent quantitative agreement to experiments and ab-initio calculations. A combined analysis of optical absorption and ARPES spectra of pristine and doped BP are used to estimate a value for the exciton binding energy of BP.