University of the Philippines Diliman (UP Diliman)

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UP Diliman

The research outputs, funded projects, and researcher profiles of the University of the Philippines Diliman, indexed under SURI and linked to the wider UP System record. Outputs are organized by academic unit, from proposal-stage grants through published, citable works.

RESEARCH OUTPUTS

Publications

Journal articles, theses, conference papers, and technical reports from UP Diliman academic units.

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PEOPLE

Researcher Profiles

Living CVs for UP Diliman faculty and researchers, linked to ORCID and verified research outputs.

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FUNDING

Grants & Projects

Funded research from proposal to publication, with funder, timeline, and project metadata.

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Author: search.filters.author.Bansil, Arun

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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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