Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene

Abstract

Here, we investigate the nonreciprocal propagation and amplification of surface plasmons in drift-current biased graphene, using both Galilean and relativistic-type Doppler shift transformations of the graphene's conductivity. Consistent with previous studies, both conductivity models predict strongly nonreciprocal propagation of surface plasmons due to the drag effect caused by the drifting electrons. In particular, the Galilean Doppler shift model leads to stronger spectral asymmetries in the plasmon dispersion with regimes of unidirectional propagation. Remarkably, it is shown that both conductivity models predict regimes of nonreciprocal plasmon amplification in a wide angular sector of in-plane directions when the drift-current biased graphene sheet is coupled to a plasmonic substrate (namely, SiC), with the plasmon amplification rate being substantially higher for the relativistic Doppler shift model.

29 pages, 10 figures

References in corpus (7)

• Dyadic Green's Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
• Quantum spin Hall effect of light
• Electromagnetic wave analogue of electronic diode
• Strong phonon-plasmon coupled modes in the graphene/silicon carbide heterosystem
• Efficient Fizeau Drag from Dirac electrons in monolayer graphene
• Nonreciprocal and non-Hermitian material response inspired by semiconductor transistors
• Engineering transistor-like optical gain in two-dimensional materials with Berry curvature dipoles

Cited by in corpus (4)

• Plasmon Fizeau drag in 3D Dirac and Weyl semimetals
• Large quantum nonreciprocity in plasmons dragged by drifting electrons
• Nonreciprocal plasmons in one-dimensional carbon nanostructures
• Nonreciprocal Response of Electrically Biased Graphene-Coated Fiber