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Valley filter and valve effect by strong electrostatic potentials in graphene.

Juan Juan Wang1, Su Liu1, Jun Wang2

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We theoretically demonstrate electrically controllable valley-filter and valley-valve effects in monolayer graphene. Strong electrostatic barriers can block or allow electron flow based on valley type and barrier sign, enabling 100% efficient valley-valve devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Monolayer graphene exhibits unique electronic properties due to its two-dimensional structure.
  • Valleytronics, which utilizes electron's valley degree of freedom, is a promising field for next-generation electronics.
  • Controlling valley transport in graphene is crucial for developing valleytronic devices.

Purpose of the Study:

  • To theoretically investigate the valley-filter and valley-valve effects in monolayer graphene.
  • To explore the possibility of electrically controlling valley transport using electrostatic potentials.
  • To understand the underlying physics of valley manipulation in graphene.

Main Methods:

  • A theoretical study based on a lattice model of monolayer graphene.
  • Simulation of electron transport through electrostatic potential barriers.
  • Analysis of the influence of barrier strength, sign, and electron flow direction on valley polarization.

Main Results:

  • A single strong electrostatic potential barrier can act as a valley-filter, blocking one valley while allowing the other.
  • The valley-filter effect is dependent on the sign of the potential barrier and the direction of electron flow.
  • A valley-valve device with two barriers can achieve up to 100% efficiency in controlling valley current.
  • Valley mixing in strong potential barrier regions is identified as the physical origin.

Conclusions:

  • Electrostatically controllable valley-filter and valley-valve effects are achievable in monolayer graphene.
  • This work provides a simple and effective electrical method for valley transport control.
  • The findings pave the way for the development of novel graphene-based valleytronic devices.