Quantifying Twist Angles in Cuprate Heterostructures with Anisotropic Raman Signatures

Lo Sardo, Flavia; Esposito, Marina; Confalone, Tommaso; Tremblay, Christophe; Vinokur, Valerii M.; Gu, Genda; Montemurro, Domenico; Massarotti, Davide; Tafuri, Francesco; Nielsch, Kornelius; Poccia, Nicola; Haider, Golam

doi:10.1002/apxr.202500108

Quantifying Twist Angles in Cuprate Heterostructures with Anisotropic Raman Signatures

Journal Article · Fri Nov 14 00:00:00 EST 2025 · Advanced Physics Research

DOI:https://doi.org/10.1002/apxr.202500108· OSTI ID:3008061

^[1]; Esposito, Marina ^[2]; ^[1]; Tremblay, Christophe ^[3]; Vinokur, Valerii M. ^[4]; ^[5]; Montemurro, Domenico ^[6]; Massarotti, Davide ^[6]; ^[6]; ^[1]; ^[7]; ^[8]

Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Technische Universität Dresden (Germany)
University of Naples Federico II (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy)
University of Sherbrooke, QC (Canada)
Terra Quantum AG, St. Gallen (Switzerland)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
University of Naples Federico II (Italy)
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); University of Naples Federico II (Italy)
Leibniz Inst. for Solid State and Materials Research (IFW), 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. This makes the twist angle a critical tunable parameter, emphasizing the need for precise control and accurate characterization during device fabrication. In particular, twisted cuprate heterostructures based on Bi₂Sr₂CaCu₂O_{8 + x} (BSCCO) have demonstrated angle-dependent superconducting properties, positioning the twist angle as a key tunable parameter. However, the twisted interface is highly unstable under ambient conditions and vulnerable to damage from conventional characterization tools such as electron microscopy or scanning probe techniques. 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, particularly utilizing the out-of-plane A_1g vibrational mode of Bi/Sr at ≈116 cm⁻¹, clear optical fingerprints of the rotational misalignment between cuprate layers are identified. The high-resolution confocal Raman setup, equipped with polarization control and RayShield filtering down to 10 cm⁻¹, allows for reliable and reproducible measurements without compromising the material's structural integrity.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0012704

OSTI ID:: 3008061

Report Number(s):: BNL--229213-2025-JAAM

Journal Information:: Advanced Physics Research, Journal Name: Advanced Physics Research Journal Issue: 12 Vol. 4; ISSN 2751-1200

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
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Quantifying Twist Angles in Cuprate Heterostructures with Anisotropic Raman Signatures

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