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Gate-Tunable Ambipolar Josephson Current in a Topological Insulator.

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We demonstrate gate-tunable Josephson current in topological insulator devices, crucial for Majorana physics. This tunable transport paves the way for exploring electrically controlled Majorana modes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Physics

Background:

  • Topological insulators (TI) with proximity-induced superconductivity are key platforms for Majorana physics.
  • Dirac surface states in TIs offer unique electronic properties.

Purpose of the Study:

  • To demonstrate gate-tunable ambipolar Josephson current in topological insulator-based Josephson junctions.
  • To investigate the influence of chemical potential and film thickness on Josephson transport.
  • To lay the foundation for electrically tunable Majorana modes.

Main Methods:

  • Fabrication of lateral Josephson junction (JJ) devices using bulk-insulating (Bi,Sb)2Te3 thin films grown by molecular beam epitaxy (MBE).
  • Electrical transport measurements to probe gate-tunable ambipolar Josephson current.
  • Numerical simulations to understand the observed transport phenomena.

Main Results:

  • Pronounced gate-tunable ambipolar Josephson current observed in thinner films, suppressed near the Dirac point but persisting across it.
  • Weaker ambipolar response in thicker films, attributed to the coexistence of surface and bulk conduction.
  • Supercurrent resilience to magnetic fields decreases near the Dirac point.

Conclusions:

  • Gate-tunable ambipolar Josephson transport demonstrated in topological insulator devices.
  • Understanding of surface and bulk conduction interplay in superconductivity is enhanced.
  • Provides a pathway for realizing electrically tunable Majorana modes for quantum computing applications.