Z-shaped graphene nanoribbon quantum dot device

Wang, Z. F.; Shi, Qinwei; Li, Qunxiang; Wang, Xiaoping; Hou, Jie; Zheng, Huaixiu; Yao, Yao; Chen, Jie

doi:10.1063/1.2761266

Cited by 124 publications

(86 citation statements)

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“…GNRs exhibit physical properties distinct from those of infinite graphene sheets. [14][15][16][17][18][19] While the optical response of graphene is in the order of the universal conductance with the absorption around a few per cent in the far infrared and visible range, [22][23][24][25] the response in graphene structures with reduced dimensionality, such as ribbons, can be significantly stronger. 20,21 In this paper, we employ a self-consistent approach to reveal some unique electronic properties in ZGNRs subject to a crossed electric and magnetic field.…”

Section: Rqolqhdu Wudqvyhuvh Fxuuhqw Uhvsrqvh Lq ]Lj]dj Judskhqh Qdqmentioning

confidence: 99%

Nonlinear transverse current response in zigzag graphene nanoribbons

Wang

Zhang

2011

Journal of Applied Physics

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By employing a self-consistent approach, we reveal a number of unique properties of zigzag graphene nanoribbons under crossed electric and magnetic fields: (1) a very strong electrical polarization along the transverse direction of the ribbon, and (2) a strong nonlinear Hall current under a rather moderate electrical field. At the field strength of 5000 V/cm, the ratio of the nonlinear current to the linear current is around 1 under an applied magnetic field of 7.9 T. Our results suggest that graphene nanoribbons are an ideal system to achieve a large electrical polarizability. Our results also suggest that the nonlinear effect in graphene nanoribbons has been grossly underestimated without the self-consistent scheme proposed here.

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Section: Rqolqhdu Wudqvyhuvh Fxuuhqw Uhvsrqvh Lq ]Lj]dj Judskhqh Qdqmentioning

confidence: 99%

Nonlinear transverse current response in zigzag graphene nanoribbons

Wang

Zhang

2011

Journal of Applied Physics

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“…The device [31], however, still needs sections of insulating ribbon with armchair edges, attached serially to both sides of the central section with zigzag edges (operating as SQD) to suppress the outward current flow. In this paper, we demonstrate numerically that a similar Z-shaped constriction, in which each of the three sections has zigzag edges (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Electron Transport and Quantum-Dot Energy Levels in Z-Shaped Graphene Nanoconstriction with Zigzag Edges

Rycerz

2010

Acta Phys. Pol. A

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Motivated by recent advances in fabricating graphene nanostructures, we find that an electron can be trapped in Z-shaped graphene nanoconstriction with zigzag edges. The central section of the constriction operates as a single-level quantum dot, as the current flow towards the adjunct sections (rotated by 60 • ) is strongly suppressed due to mismatched valley polarization, although each section in isolation shows maximal quantum value of the conductance G 0 = 2 e 2 /h. We further show that the trapping mechanism is insensitive to the details of constriction geometry, except from the case when widths of the two neighboring sections are equal. The relation with earlier studies of electron transport through symmetric and asymmetric kinks with zigzag edges is also established.

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“…SETs are constructed of a small sub-micron sized island, which is coupled to source and drain terminals [75]. There is the theoretical study of bound states in narrow graphene ribbons for a given number of boundary conditions [76,77]. In an experimental set up it has been displayed that a graphene island with a size smaller than 100 nm is connected through two graphene constrictions to wide graphene contact regions [78].…”

Section: Graphene Single Electron Transistormentioning

confidence: 99%