Abstract
The characteristics of tunnel junctions formed between n- and p-doped graphene are investigated theoretically. The single-particle tunnel current that flows between the two-dimensional electronic states of the graphene (2D–2D tunneling) is evaluated. At a voltage bias such that the Dirac points of the two electrodes are aligned, a large resonant current peak is produced. The magnitude and width of this peak are computed, and its use for devices is discussed. The influences of both rotational alignment of the graphene electrodes and structural perfection of the graphene are also discussed.
Highlights
Two-dimensional (2D) electron systems have played a very important role in the development of electronic devices, including metal-oxide-semiconductor field-effect transistors (MOSFETs) made from silicon and high electron mobility transistors (HEMTs) made from III-V semiconductor heterostructures.[1]
There is little temperature dependence in the width of the resonant peak, as already noted in prior work,[2,3] the height of the peak increases somewhat with temperature since greater numbers of states are accessed at the higher T
As discussed in Section II(B), the height of the resonant peak is proportional to the structural coherence length L, with the width being proportional to 1/ L
Summary
Two-dimensional (2D) electron systems have played a very important role in the development of electronic devices, including metal-oxide-semiconductor field-effect transistors (MOSFETs) made from silicon and high electron mobility transistors (HEMTs) made from III-V semiconductor heterostructures.[1]. Prior investigations of 2D-2D tunneling have been carried out on coupled electron gas systems in closely placed quantum wells in AlGaAs/GaAs heterostructures.[2,3] Considering the case of unequal doping between the 2DEGs, it was demonstrated experimentally that, at a voltage bias corresponding to aligned band structures of the 2D systems, a large, sharp peak in the tunnel current occurs. We refer to this peak as a resonant peak in the tunneling. It was argued in the prior work that the width of this peak was temperature independent[2,3] (except possibly from inelastic effects)
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