Interaction of gated and ungated plasmons in two-dimensional electron systems

Abstract

Unique properties of plasmons in two-dimensional electron systems (2DESs) have been studied for many years. Existing theoretical approaches allow for analytical study of the properties of ungated and gated plasmons in two fundamental, ideal cases - the 2DES in dielectric environment and under an infinite metallic gate, respectively. However, it is for the first time that we introduce an analytical theory of the interaction of gated and ungated plasmons in partly gated 2DES. Generally, a finitewidth gate is formed by a metallic strip placed over an infinite plane hosting 2D electrons. Our solution, in particular, describes the propagating plasmon modes with their charge density having N nodes under the gate. In this regard, a new mode with N = 0 has been found in addition to the gapped modes with N = 1, 2,..., previously derived from numerical calculations. Unexpectedly, this fundamental plasmon mode has been found to differ substantially from the rest. In fact, it is characterised by gapless square root dispersion and represents a hybrid of gated and ungated plasmons. In contrast to the higher modes, the currents and lateral fields of the fundamental mode are localized mainly to the outside area in the vicinity of the gate. Heretofore, such a 'near-gate plasmon' has never been considered.

arXiv comment7 pages, 4 figures

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Cited by in corpus (11)

• Tight-binding terahertz plasmons in chemical vapor deposited graphene
• Novel 2D Plasmon Induced by Metal Proximity
• An engineered planar plasmonic reflector for polaritonic mode confinement
• Second harmonic generation at the edge of a two-dimensional electron gas
• Thresholdless excitation of edge plasmons by transverse current
• Universal superdiffusive modes in charged two dimensional liquids
• Plasmons and magnetoplasmons in partially bounded two-layer electron systems
• Plasmons in two-dimensional electron systems with infinite and semi-infinite metal gratings
• Plasmon damping in electronically open systems
• Unconventional quantization of 2D plasmons in cavities formed by gate slots
• Quasi-stationary near-gate plasmons in van der Waals heterostructures