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Nonlocal annihilation of Weyl fermions in correlated systems by Crippa, L. ;Amaricci, A. ;Wagner, N. ;Sangiovanni, G. ;Budich, J. C. ;Capone, M. is a Physics and Astronomy article available to read on EtoBox.

What is Nonlocal annihilation of Weyl fermions in correlated systems about?

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.

Who reads Nonlocal annihilation of Weyl fermions in correlated systems?

Author

Crippa, L. ;Amaricci, A. ;Wagner, N. ;Sangiovanni, G. ;Budich, J. C. ;Capone, M.

Publisher

American Physical Society (APS)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)