College of Science (UPD)

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College of Science

The research outputs, creative works, faculty researcher profiles, and funded projects of the College of Science of the University of the Philippines Diliman. This community brings together scholarly and artistic contributions from its academic departments within the SURI research repository.

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  • Institute of Biology
  • Institute of Chemistry
  • Institute of Environmental Science and Meteorology
  • Institute of Mathematics
  • Marine Science Institute
  • Materials Science and Engineering Program
  • National Institute of Geological Sciences
  • National Institute of Molecular Biology and Biotechnology
  • National Institute of Physics

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    Item type:Publication,
    Relativistic horizon of interacting Weyl fermions in condensed matter systems
    (arXiv, 2022)
    Chiu, Wei-Chi
    ;
    Chang, Guoqing
    ;
    Macam, Gennevieve
    ;
    Belopolski, Ilya
    ;
    Huang, Shin-Ming
    The intersections of topology, geometry and strong correlations offer many opportunities for exotic quantum phases to emerge in condensed matter systems. Weyl fermions, in particular, provide an ideal platform for exploring the dynamical instabilities of single-particle physics under interactions. Despite its fundamental role in relativistic field theory, the concept of causality and the associated spacetime light cone and event horizon has not been considered in connection with interacting Weyl fermionic excitations in quantum matter. Here, by using charge-density wave (CDW) as an example, we unveil the behavior of interacting Weyl fermions and show that a Weyl fermion in a system can open a band gap by interacting only with other Weyl fermions that lie within its energy-momentum dispersion cone. In this sense, causal connections or interactions are only possible within overlapping dispersion cones and each dispersion cone thus constitutes a solid-state analogue of the more conventional `event horizon' of high-energy physics. Our study provides a universal framework for considering interacting relativistic quasiparticles in condensed matter by separating them into energy-like and momentum-like relationships in analogy with the time-like and space-like events in high-energy physics. Finally, we consider two different candidate materials for hosting the Weyl CDW phase: (TaSe$_4$)$_2$I and Mo$_3$Al$_2$C. Our study greatly enriches the phenomenology and unveils new connections between condensed matter and high-energy physics.

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