Graphene-based modulation-doped superlattice structures

Abstract

The electronic transport properties of graphene-based superlattice structures are investigated. A graphene-based modulation-doped superlattice structure geometry is proposed and consist of periodically arranged alternate layers: InAs/graphene/GaAs/graphene/GaSb. Undoped graphene/GaAs/graphene structure displays relatively high conductance and enhanced mobilities at elevated temperatures unlike modulation-doped superlattice structure more steady and less sensitive to temperature and robust electrical tunable control on the screening length scale. Thermionic current density exhibits enhanced behaviour due to presence of metallic (graphene) mono-layers in superlattice structure. The proposed superlattice structure might become of great use for new types of wide-band energy gap quantum devices.Comment: 5 figure

Magnetic Minibands and Electron–Electron Bound States in Ac-Driven Graphene with Space-Modulated Gap

“…After substitution of (10) into (8) we find that the right side of equation (8) is zero. As a result the problem of the electron state in ac-driven GSMG is reduced to the solving of the equation…”

Effect of transverse electric field on the longitudinal current–voltage characteristic of graphene superlattice

“…First, GSLs have already been fabricated under laboratory conditions [5,36,37]. Second, the GSL band structure has been thoroughly analyzed [29][30][31][32][33][34][35]. Third, as was shown above, a transverse electric field modifies the longitudinal GSL I-V characteristic, due to which one can control the position of the NDC portion, leaving intact the internal structure of material.…”

“…The GSL electron spectrum was theoretically studied in [29][30][31][32][33][34][35], and GSLs were fabricated under laboratory conditions in [5,36,37]. It was shown in [29] that low-energy electrons in GSL behave as massless particles obeying the anisotropic dispersion relation.…”

Possibility of propagation of dissipative solitons in ac-driven superlattice

“…However, there is another requirement for frequency ω which is related to the chaotic behavior of the electron subsystem of SL [30,31]. In this section, we investigate the conditions for the HF-field amplitude a and frequency ω under which dynamic chaotization of the electronic subsystem in the ac-driven model (5) occurs. For the argument ξ = (x − ut)L, Eq.…”