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  • Open Access

Lifshitz transition in a holographic finite density flavor brane Weyl semimetal

Cheng-Yuan Lu1,*, Xian-Hui Ge1,2,†, and Sang-Jin Sin3,‡

  • 1Department of Physics, Shanghai University, Shanghai 200444, China
  • 2Shanghai Key Laboratory of High Temperature Superconductors, Shanghai 200444, China
  • 3Department of Physics, Hanyang University, Seoul, 04763, South Korea

  • *Contact author: luchengyuan@shu.edu.cn
  • †Contact author: gexh@shu.edu.cn
  • ‡Contact author: sjsin@hanyang.ac.kr
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Phys. Rev. D 113, 026028 – Published 29 January, 2026

DOI: https://doi.org/10.1103/yyrz-kfbm

Abstract

We extend a top-down holographic model of a Weyl semimetal to finite charge density and compute the fermionic spectral function by introducing two probe fermions of opposite chirality. The model is controlled by the boundary fermion mass M and the chemical potential μ. In the zero density, small-M limit, we recover four energy bands, two Weyl points, and linear dispersion in their vicinity, the hallmarks of a Weyl semimetal. As M increases, the bands between the Weyl points become progressively compressed and the spectral weight associated with those bands is smeared out. At finite charge density, we map the Fermi surface in momentum space and identify a Lifshitz transition: two distinct Fermi pockets, each enclosing a different Weyl point, merge into a single large Fermi surface that encloses both. This transition can be induced by either control parameter. Varying M alters the band structure and thus the band shape, which drives the Lifshitz transition, whereas changing μ shifts the bands relative to the Fermi level without qualitatively changing the band structure, producing the Lifshitz transition by moving the band positions.

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Phys. Rev. D 113, 026028– Published 29 January, 2026
  • Received 6 October 2025
  • Accepted 22 December 2025
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