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A tunable monolithic SQUID in twisted bilayer graphene.

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Researchers created a superconducting quantum interference device (SQUID) in magic-angle twisted bilayer graphene (MATBG). This device demonstrates controlled superconducting phase differences and long-range coherence, paving the way for novel electronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Electronics

Background:

  • Magic-angle twisted bilayer graphene (MATBG) exhibits tunable correlated states, including superconductivity.
  • Previous work realized tunable Josephson junctions in MATBG, but lacked control over superconducting phase differences.
  • Superconducting Quantum Interference Devices (SQUIDs) are crucial for detecting minute magnetic fields and studying quantum phenomena.

Purpose of the Study:

  • To construct and characterize a SQUID device in MATBG.
  • To demonstrate electrostatic control over superconducting phase differences in MATBG.
  • To investigate the coherence and properties of superconducting charge carriers in MATBG.

Main Methods:

  • Fabrication of a SQUID device using gate-defined junctions in MATBG.
  • Control of superconducting phase difference via applied magnetic field.
  • Measurement of critical current magneto-oscillations and device inductance.

Main Results:

  • Successful realization of a tunable SQUID in MATBG.
  • Observation of magneto-oscillations confirming long-range coherence of superconducting charge carriers (effective charge 2e).
  • Electrostatic tuning of SQUID asymmetry and measurement of large inductances (up to 2 μH).

Conclusions:

  • Complex devices can be realized in MATBG, enabling detailed material property investigations.
  • The demonstrated SQUID functionality in MATBG opens avenues for advanced quantum devices.
  • Findings support the development of novel applications like phase-slip junctions and high kinetic inductance detectors.