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The surface of a Weyl semimetal (WSM) displays Fermi arcs, ie, disjoint segments of a two-dimensional Fermi contour. We present a quantum-mechanical nonlocal theory of chiral Fermi arc plasmons in WSMs with broken time-reversal symmetry. These are collective excitations constructed from topological Fermi arc and bulk electron states and arising from electron-electron interactions, which are treated in the realm of the random phase approximation. Our theory includes quantum effects associated with the penetration of the Fermi arc surface states into the bulk and dissipation, which is intrinsically nonlocal in nature and arises from decay processes mainly involving bulk electron-hole pair excitations.
American Physical Society
Publication date: 
28 Mar 2018

Gian Marcello Andolina, Francesco MD Pellegrino, Frank HL Koppens, Marco Polini

Biblio References: 
Volume: 97 Issue: 12 Pages: 125431
Physical Review B