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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.