A novel undamped gapless plasmon mode in tilted type-II Dirac semimetal

Abstract

We predict the existence of a novel long-lived gapless plasmon mode in a type-II Dirac semimetal (DSM). This gapless mode arises from the out-of-phase oscillations of the density fluctuations in the electron and the hole pockets of a type-II DSM. It originates beyond a critical wave-vector along the direction of the tilt axis, owing to the momentum separation of the electron and hole pockets. A similar out-of-phase plasmon mode arises in other multi-component charged fluids as well, but generally it is Landau damped and lies within the particle-hole continuum. In the case of a type-II DSM, the open Fermi surface prohibits low-energy finite momentum single-particle excitations, creating a `gap' in the particle-hole continuum. The gapless plasmon mode lies within this particle-hole continuum gap and, thus, it is protected from Landau damping.

arXiv comment5 pages, 3 figurers. Comments are welcome

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• Undamped transverse electric mode in undoped two-dimensional tilted Dirac cone materials
• Photonic Topological Transitions and Epsilon-Near-Zero Surface Plasmons in Type-II Dirac Semimetal NiTe${}_2$
• Intrinsic nonreciprocal bulk plasmons in noncentrosymmetric magnetic systems
• Acoustic plasmons in type-I Weyl semimetals
• Probing mirror anomaly and classes of Dirac semimetals with circular dichroism
• Dipolar optical plasmon in thin-film Weyl semimetals
• Collective plasmonic modes in the chiral multifold fermionic material CoSi