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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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Phase-selective Floquet engineering in a charge density wave material.

Fei Wang1,2, Xuanxi Cai1,2, Teng Xiao1,2

  • 1Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

Floquet engineering uses light to control quantum materials. In 1T-TiSe2, light and charge density waves combine for phase-selective control, creating new electronic states.

Keywords:
Floquet engineeringTiSe2TrARPEScharge density wavelight-induced band renormalization

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Light-Matter Interactions

Background:

  • Floquet engineering dynamically alters quantum material electronic structures using time-periodic light fields.
  • Spatially periodic modulations, like charge density waves (CDW), also reconstruct electronic structures via symmetry breaking.
  • The interplay between temporal (light) and spatial (CDW) modulations offers new control pathways.

Purpose of the Study:

  • To experimentally demonstrate phase-selective Floquet engineering by combining temporal light modulation with spatial CDW order.
  • To investigate the synergistic effects of light fields and CDW in the material 1T-TiSe2.

Main Methods:

  • Utilized time- and angle-resolved photoemission spectroscopy (TAR-PES).
  • Employed mid-infrared ultrafast laser pulses for pumping.
  • Studied the prototypical charge density wave material 1T-TiSe2.

Main Results:

  • Observed a momentum-dependent, pump-induced instantaneous downshift of the valence band maximum (VBM).
  • This downshift occurred exclusively in the CDW phase and only during pump pulse presence.
  • The effect peaked when pumping near resonance with the CDW gap, contrasting with later CDW melting dynamics.

Conclusions:

  • The charge density wave order is critical for enabling phase-selective Floquet engineering in 1T-TiSe2.
  • Demonstrated that time-periodic drives synergistically couple with spatially periodic modulations.
  • Established a paradigm for phase-selective Floquet engineering leveraging spontaneous symmetry breaking.