Dresden 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.11: Poster
Tuesday, March 10, 2026, 18:00–20:00, P1
Spectroscopic Imaging Ellipsometry at Cryogenic Temperatures Reveals Peak Splitting in 2D Polar Silver — •Ulrich Limberg1, Jakob Henz1, Siavash Rajabpour2, Alexander Vera2, Arpit Jain2, Joshua A. Robinson2, Su Ying Quek3, and Ursula Wurstbauer1 — 1Institute of Physics, Munster, Germany — 2MatSE PennState, Pennsylvania, USA — 3Centre of Advanced 2D Materials, Signapore, Signapore
Two-dimensional (2D) polar metals are a new class of atomically thin materials created by confinement heteroepitaxial growth, where metallic species such as silver are intercalated between epitaxial graphene and a 6H-SiC substrate [1]. Silver intercalation leads to two competing semiconducting monolayer phases, the metastable Ag(1) and the stable Ag(2), each showing distinct opto-electronic behaviour [2].
Spectroscopic imaging ellipsometry (SIE) enables spatially resolved analysis of the complex dielectric function of both phases. Using temperature-dependent SIE from 5 K to room temperature, we investigate the modification of the linear light-matter interaction of 2D polar Ag with temperature. At low temperatures, we detect a splitting of the characteristic absorption peak of Ag(2). The experimentally determined dielectric function agrees well with theoretical predictions [2].
[1] N. Briggs et al., Nat. Mater. 19.6, 637-643 (2020).
[2] A. Jain et al. in preparation (2025).
Keywords: polar metal; ellipsometry; 2D silver; low temperature