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Researchers show that saddle points in 2D materials can be controlled by laser light polarization. This discovery enables ultrafast information writing in quantum matter using light-wave control of saddle-polarized states.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Materials Science

Background:

  • Low-energy valleys in 2D materials offer a route for ultrafast information writing using laser light.
  • Excited charge at K or K* valleys represents fundamental quantum states (0 and 1).

Purpose of the Study:

  • To demonstrate light-wave control over information states using saddle points in 2D materials.
  • To explore the potential of saddle points for ultrafast information manipulation.

Main Methods:

  • Utilizing linearly polarized light to excite saddle points in graphene.
  • Investigating excitation in both subcycle strong field and multicycle pulse regimes.

Main Results:

  • Linearly polarized light excites 2 out of 3 inequivalent M point saddles in graphene.
  • The direction of the polarization vector determines the realized excited configurations.
  • Saddle excitation is robust and creates "saddle polarized" states.

Conclusions:

  • Saddle points, in addition to valleys, possess light-wave control over information states.
  • Findings are applicable to graphene family and Xenes like stanene.
  • Opens avenues for rich and ultrafast light-based manipulation of quantum matter.