The Lifshitz transition from type-I to type-II Weyl states is equivalent to a black hole horizon, featuring a Dirac-line Fermi surface with nontrivial topological invariant and critical chiral anomaly.
Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides XP$_2$ (X = Mo, W)
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abstract
The recently discovered type-II Weyl points appear at the boundary between electron and hole pockets. Type-II Weyl semimetals that host such points are predicted to exhibit a new type of chiral anomaly and possess thermodynamic properties very different from their type-I counterparts. In this Letter, we describe the prediction of a type-II Weyl semimetal phase in the transition metal diphosphides MoP$_2$ and WP$_2$. These materials are characterized by relatively simple band structures with four pairs of type-II Weyl points. Neighboring Weyl points have the same chirality, which makes the predicted topological phase robust with respect to small perturbations of the crystalline lattice. In addition, this peculiar arrangement of the Weyl points results in long topological Fermi arcs, thus making them readily accessible in angle-resolved photoemission spectroscopy.
years
2026 2verdicts
UNVERDICTED 2representative citing papers
Orbital magnetic moment suppresses total magnetoconductivities in gapless type-II Weyl semimetals in linear and nonlinear responses, with differences arising compared to type-I Weyl semimetals.
citing papers explorer
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Dirac-Line Criticality and Emergent Horizons in Weyl Lifshitz Transitions
The Lifshitz transition from type-I to type-II Weyl states is equivalent to a black hole horizon, featuring a Dirac-line Fermi surface with nontrivial topological invariant and critical chiral anomaly.
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Magneto-optical transport in type-II Weyl semimetals in the presence of orbital magnetic moment
Orbital magnetic moment suppresses total magnetoconductivities in gapless type-II Weyl semimetals in linear and nonlinear responses, with differences arising compared to type-I Weyl semimetals.