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Bulk Topological Proximity Effect.

Timothy H Hsieh1, Hiroaki Ishizuka1, Leon Balents1

  • 1Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA.

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Summary
This summary is machine-generated.

Topological phases can induce an inverse proximity effect on coupled systems, even without a local order parameter. This "bulk topological proximity effect" was rigorously established for various topological phases.

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Area of Science:

  • Condensed Matter Physics
  • Topological Matter
  • Quantum Materials

Background:

  • Proximity effects typically arise from systems with local order parameters (e.g., magnetic moments, superconducting pairing).
  • Existing theories do not account for proximity effects in topological phases lacking local order parameters.

Purpose of the Study:

  • To demonstrate that topological phases can induce a distinct, inverted proximity effect.
  • To introduce and establish the concept of a "bulk topological proximity effect".

Main Methods:

  • General coupling construction between a topological phase and a second system.
  • Rigorous mathematical proof for all gapped free-fermion topological phases.
  • Analysis of representative integrable models for interacting topological phases.

Main Results:

  • Established the existence of an inverse proximity effect in topological phases.
  • Demonstrated that topological order can be induced in an adjacent system.
  • Illustrated phenomenological consequences using a terrace construction.

Conclusions:

  • Topological phases exhibit a unique proximity effect, termed "bulk topological proximity effect".
  • This effect is general and applies to various topological phases, including interacting ones.
  • The framework can be extended to intrinsic topological order.