Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.17: Poster
Montag, 1. April 2019, 17:30–20:00, Poster E
Three-dimensional electronic band dispersion in bulk black phosphorus — •Charlotte Sanders1, Klara Volckaert2, Deepnarayan Biswas2, Marco Bianchi2, Jill Miwa2, Søren Ulstrup2, and Philip Hofmann2 — 1Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, U.K. — 2Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark
Bulk black phosphorus has a layered structure similar to that of pseudo-two-dimensional materials like graphite and bulk MoS2. However, to a greater extent than in some other layered materials, interlayer interaction plays an important role in determining the electronic properties of black phosphorus, leading to a distinctive kz-dispersing band and a direct band gap of 0.3 eV at the Z point of the Brillouin zone. Investigations by angle-resolved photoemission spectroscopy (ARPES) of the three-dimensional dispersion of nominally undoped black phosphorus have been reported (e.g., [1,2]), but several questions remain unanswered. For example, a surface resonance state has been reported [2]; but whether such a state in fact exists, and what its origin might be, remain in doubt. Furthermore, ARPES measurements have yielded results that differ rather widely from predictions from theory. Here I will present ARPES measurements--spanning the photon energy range hv=15-135 eV--of the three-dimensional band structure of bulk black phosphorus, and I will suggest how our results can address some of the questions which have remained unresolved in the literature so far. [1] PRB 33 (1986) 4324. [2] PRB 90 (2014) 085101.