%0 Journal Article %1 PhysRevResearch.2.012023 %A Crippa, L. %A Amaricci, A. %A Wagner, N. %A Sangiovanni, G. %A Budich, J. C. %A Capone, M. %D 2020 %I American Physical Society %J Phys. Rev. Res. %K a b %N 1 %P 012023 %R 10.1103/PhysRevResearch.2.012023 %T Nonlocal annihilation of Weyl fermions in correlated systems %U https://link.aps.org/doi/10.1103/PhysRevResearch.2.012023 %V 2 %X Weyl semimetals (WSMs) are characterized by topologically stable pairs of nodal points in the band structure that typically originate from splitting a degenerate Dirac point by breaking symmetries such as time-reversal or inversion symmetry. Within the independent-electron approximation, the transition between an insulating state and a WSM requires the local creation or annihilation of one or several pairs of Weyl nodes in reciprocal space. Here, we show that strong electron-electron interactions may qualitatively change this scenario. In particular, we reveal that the transition to a Weyl semimetallic phase can become discontinuous, and, quite remarkably, pairs of Weyl nodes with a finite distance in momentum space suddenly appear or disappear in the spectral function. We associate this behavior with the buildup of strong many-body correlations in the topologically nontrivial regions, manifesting in dynamical fluctuations in the orbital channel. We also highlight the impact of electronic correlations on the Fermi arcs.

@article{PhysRevResearch.2.012023, abstract = {Weyl semimetals (WSMs) are characterized by topologically stable pairs of nodal points in the band structure that typically originate from splitting a degenerate Dirac point by breaking symmetries such as time-reversal or inversion symmetry. Within the independent-electron approximation, the transition between an insulating state and a WSM requires the local creation or annihilation of one or several pairs of Weyl nodes in reciprocal space. Here, we show that strong electron-electron interactions may qualitatively change this scenario. In particular, we reveal that the transition to a Weyl semimetallic phase can become discontinuous, and, quite remarkably, pairs of Weyl nodes with a finite distance in momentum space suddenly appear or disappear in the spectral function. We associate this behavior with the buildup of strong many-body correlations in the topologically nontrivial regions, manifesting in dynamical fluctuations in the orbital channel. We also highlight the impact of electronic correlations on the Fermi arcs.}, added-at = {2020-03-20T12:00:02.000+0100}, author = {Crippa, L. and Amaricci, A. and Wagner, N. and Sangiovanni, G. and Budich, J. C. and Capone, M.}, biburl = {https://www.bibsonomy.org/bibtex/2fc3b5b3a6e869e5aff999f802ec95217/ctqmat}, day = 22, description = {Phys. Rev. Research 2, 012023(R) (2020) - Nonlocal annihilation of Weyl fermions in correlated systems}, doi = {10.1103/PhysRevResearch.2.012023}, interhash = {d8f7164fac3ba991c1f22414b3a91b54}, intrahash = {fc3b5b3a6e869e5aff999f802ec95217}, journal = {Phys. Rev. Res.}, keywords = {a b}, month = {1}, note = {cite arxiv:1904.11836Comment: 6 pages, 4 figures}, number = 1, numpages = {6}, pages = 012023, publisher = {American Physical Society}, timestamp = {2023-10-18T15:42:55.000+0200}, title = {Nonlocal annihilation of Weyl fermions in correlated systems}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.2.012023}, volume = 2, year = 2020 }