Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Graphene, 2D and Twisted Materials
TT 4.11: Vortrag
Montag, 9. März 2026, 12:15–12:30, HSZ/0105
Quantifying Twist Angles in Cuprate Heterostructures with Anisotropic Raman Signatures — •Flavia Lo Sardo1,2, Marina Esposito3,4, Tommaso Confalone1,5, Kornelius Nielsch1,2,5, Nicola Poccia1,3, and Haider Golam1 — 1Leibniz Institute for Solid State and Materials Research Dresden (IFWDresden), 01069 Dresden, Germany — 2Institute of Materials ScienceTechnische Universität DresdenDresden 01062, Germany — 3Department of PhysicsUniversity of Naples Federico IINaples 80126, Italy — 4National Institute for Nuclear Physics (INFN) - Sezione di NapoliNaples 80126, Italy — 5Institute of Applied PhysicsTechnische Universität Dresden, 01062 Dresden, Germany
Artificially engineered twisted van der Waals (vdW) heterostructures have unlocked new pathways for exploring emergent quantum phenomena and strongly correlated electronic states. Many of these phenomena are highly sensitive to the twist angle, which can be deliberately tuned to tailor the interlayer interactions which makes the twist angle a critical tunable parameter. In particular, twisted cuprate heterostructures based on Bi2Sr2CaCu2O8+x (BSCCO) have demonstrated angle-dependent superconducting properties, positioning the twist angle as a key tunable parameter. In this work, a fully non-invasive, polarization-resolved Raman spectroscopy approach is introduced for determining twist angles in artificially stacked BSCCO heterostructures. By analyzing twist-dependent anisotropic vibrational Raman modes, clear optical fingerprints of the rotational misalignment between cuprate layers are identified.
Keywords: anisotropic phonon modes; Bi 2 Sr2 CaCu2 O 8+X; polarization-resolved Raman spectroscopy; twist angle metrology; twisted cuprate heterostructures