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Time-reversal even charge hall effect from twisted interface coupling.

Dawei Zhai1,2, Cong Chen1,2, Cong Xiao3,4

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Summary
This summary is machine-generated.

We discovered a time-reversal even linear charge Hall effect in 2D crystals, overcoming Onsager relations via interfacial coupling. This breakthrough in layertronics is controllable with gate voltage.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • The Onsager relation typically forbids linear charge Hall response under time-reversal symmetry.
  • Investigating novel mechanisms for Hall effects beyond conventional limitations is crucial.

Purpose of the Study:

  • To demonstrate a time-reversal even linear charge Hall effect in non-isolated 2D crystals.
  • To identify the underlying physics and material platforms for this effect.
  • To explore its potential applications in emerging electronic devices.

Main Methods:

  • Theoretical investigation of interfacial coupling in twisted 2D materials.
  • Analysis of band geometric quantities, specifically momentum-space vorticity.
  • Experimental validation in twisted bilayer graphene and transition metal dichalcogenides.

Main Results:

  • Realization of a time-reversal even linear charge Hall effect enabled by interfacial coupling and twisted stacking.
  • Identification of momentum-space vorticity of layer current as the key band geometric quantity.
  • Observation of giant Hall ratios in twisted bilayer graphene and transition metal dichalcogenides, controllable via gate voltage.

Conclusions:

  • The study overcomes conventional restrictions on Hall response, revealing new physics in chiral 2D systems.
  • This work establishes layertronics as a promising research direction, utilizing layer degrees of freedom for novel quantum effects.
  • The demonstrated effect offers potential for developing new electronic devices with gate-tunable properties.