Abstract
We investigate effects of the electron traps on adiabatic charge transport in graphene nanoribbons under a longitudinal surface acoustic wave (SAW) potential. Due to the weak SAW potential and strong transverse confinement of nanoribbons, minibands of sliding tunnel-coupled quantum dots are formed. Therefore, as the chemical potential passes through minigaps, quantized adiabatic charge transport is expected to occur. We analyze the condition for a closed minigap, thereby destroying the current quantization in a nanoribbon. We present numerical calculations showing the localized energy states within minigaps. Additionally, we compare the results with the minibands of corrugated nanoribbons.
Highlights
A considerable amount of research work has been carried out so far on the design and improvement of electronic devices that are based on the use of quantized adiabatic charge transport. [1,2,3,4,5,6,7,8,9,10,11] Electronics 2013, 2 under a surface-acoustic wave (SAW), the inelastic capture and tunneling escape effects on the non-adiabatic transport of photo-excited charges in quantum wells was investigated
An SAW is launched on a piezoelectric heterostructure, such as GaAs/AlGaAs, and GHz single/few-electron pumps have been gaining close scrutiny due to the fact that the measured currents lie within the nanoamp range, high enough for the measured current to be suitable as a current standard
We compare the results for SAW-based dynamic quantum dot (QD) in Figures 1 and 2 with those for static QDs created by corrugation on a graphene nanoribbon in the absence of an SAW and electron traps
Summary
A considerable amount of research work has been carried out so far on the design and improvement of electronic devices that are based on the use of quantized adiabatic charge transport. [1,2,3,4,5,6,7,8,9,10,11] Electronics 2013, 2 under a surface-acoustic wave (SAW), the inelastic capture and tunneling escape effects on the non-adiabatic transport of photo-excited charges in quantum wells was investigated. [12] The underlying challenge is to produce a device with an accuracy for the quantized current of one part in 108 on the plateaus. SAW potential has induced a series of dynamic (sliding) tunnel-coupled QDs whose impenetrable wall is constructed through destructive interference of the electronic wave functions around a minimum of the SAW potential In principle, such an adiabatic-transport device could provide an important. The current quantization should be completely smeared out when the level broadening from impurity scattering becomes comparable to the minigaps of dynamic tunnel-coupled QDs. On the other hand, we can simulate localized electron traps by superposing a series of negative δ-potentials onto an SAW potential within each spatial period. Varying the weight or the position of the δ-potential leads to different positions of localized trap levels within the minigaps of the nanoribbon These inevitable fluctuations of the trap potential in a realistic system would most likely impede the current quantization.
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