Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 70: Spin phenomena in semiconductors

HL 70.5: Vortrag

Donnerstag, 19. März 2020, 16:00–16:15, POT 251

Absence of giant Rashba effect in the valence band of CsPbBr3 — •Maryam Sajedi^1,2, Maxim Krivenkov^1,2, Dmitry Marchenko¹, Andrei Varykhalov¹, Jaime Sánchez-Barriga¹, and Oliver Rader¹ — ¹Helmholtz Zentrum Berlin für Materialien und Energie, Albert Einstein Str 15, D-12489, Berlin, Germany — ²Department of physics, Potsdam University, Am Neuen Palais 10, D-14415, Potsdam Germany

We have employed spin- and angle-resolved photoemission spectroscopy of CsPbBr3 single crystal to verify the presence of Rashba spin-orbit coupling effect in the highest lying occupied state. We uncover the entire three-dimensional Brillouin zone (BZ) momentum-space, and the dispersion of the topmost bulk valence band (VB) at high symmetry R-point. We use density functional theory (DFT) calculations to compare the ground state electronic structure of the particular perovskite compound with corresponding dispersive bands from photoemission (PES) experiments. By direct experimental evidence from the results of spin-resolved band structure experiments, we exclude a large Rashba effect in the global valence band maximum (VBM) at R-point of bulk BZ.