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Acoustic Plasmons at the Crossover Between the Collisionless and Hydrodynamic Regimes in Two-dimensional Electron Liquids by Torre, Iacopo; de Castro, Luan Vieira; Van Duppen, Ben; Ruiz, David Barcons; Peeters, François M.; Koppens, Frank H. L.; Polini, Marco is a scholarly article available to read on EtoBox.

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Hydrodynamic flow in two-dimensional electron systems has so far been probed only by dc transport and scanning gate microscopy measurements. In this work we discuss theoretically signatures of the hydrodynamic regime in near-field optical microscopy. We analyze the dispersion of acoustic plasmon modes in two-dimensional electron liquids using a non-local conductivity that takes into account the effects of (momentum-conserving) electron-electron collisions, (momentum-relaxing) electron-phonon and electron-impurity collisions, and many-body interactions beyond the celebrated Random Phase Approximation. We derive the dispersion and, most importantly, the damping of acoustic plasmon modes and their coupling to a near-field probe, identifying key experimental signatures of the crossover between collisionless and hydrodynamic regimes.

Author

Torre, Iacopo; de Castro, Luan Vieira; Van Duppen, Ben; Ruiz, David Barcons; Peeters, François M.; Koppens, Frank H. L.; Polini, Marco

Published

2018

Language

EN