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Moiré engineering of Cooper-pair density modulation states
Zihao Wang1, Bing Xia1, Stephen Paolini1
1Department of Physics, The Pennsylvania State University, University Park, PA, USA.
Nature
|April 1, 2026
Summary
Researchers created novel moiré-induced Cooper-pair density modulation (CPDM) states in designer heterostructures. This breakthrough offers new ways to engineer and control superconducting phases using moiré superlattices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Cooper-pair density modulation (CPDM) states are superconducting phases with spatially periodic order parameters.
- Moiré superlattices in layered materials offer tunable platforms for engineering charge density and controlling CPDM states.
Purpose of the Study:
- To demonstrate moiré-induced CPDM states in a novel bilayer heterostructure.
- To explore the control of CPDM states through material synthesis and moiré superlattice engineering.
Main Methods:
- Epitaxial stacking of topological insulator Sb2Te3 on antiferromagnetic FeTe to form a bilayer heterostructure.
- Scanning tunnelling microscopy and spectroscopy (STM/S) to image moiré superlattices and superconducting gaps.
- Josephson STM/S measurements to directly visualize CPDM states.
Main Results:
- A moiré superlattice was observed between Sb2Te3 and FeTe, spatially modulating superconducting gaps.
- CPDM states were directly imaged with wavelengths matching the moiré superlattice periodicity.
- Substitution with Bi2Te3 allowed control over CPDM state periodicity and magnitude.
Conclusions:
- An epitaxial strategy for creating moiré superlattices from materials with different crystal symmetries was demonstrated.
- A new mechanism for engineering CPDM states in designer bilayer heterostructures was revealed.
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