Transport in suspended monolayer and bilayer graphene under strain: A new platform for material studies

Zhang, Hang; Huang, Junlin; Velasco, Jairo; Myhro, Kevin; Maldonado, Matt; Tran, David; Zhao, Zhenyu; Wang, Fenglin; Lee, Yongjin; Liu, Gang; Bao, Wenzhong; Lau, Chun Ning

doi:10.1016/j.carbon.2013.12.033

Cited by 21 publications

(21 citation statements)

References 36 publications

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“…Edge actuation, where the control variables are the displacements applied to the edge, is another deformation mode [26,30]. In experiments, it may be preferable to apply these edge displacements indirectly, by applying electromechanical forces to the electrodes attached to a graphene flake [65]. The position and shape of the electrodes form the control variables in this case.…”

Section: Resultsmentioning

confidence: 99%

Designing electronic properties of two-dimensional crystals through optimization of deformations

Jones¹,

Pereira²

2014

New J. Phys.

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One of the enticing features common to most of the two-dimensional (2D) electronic systems that, in the wake of (and in parallel with) graphene, are currently at the forefront of materials science research is the ability to easily introduce a combination of planar deformations and bending in the system. Since the electronic properties are ultimately determined by the details of atomic orbital overlap, such mechanical manipulations translate into modified (or, at least, perturbed) electronic properties. Here, we present a general-purpose optimization framework for tailoring physical properties of 2D electronic systems by manipulating the state of local strain, allowing a one-step route from their design to experimental implementation. A definite example, chosen for its relevance in light of current experiments in graphene nanostructures, is the optimization of the experimental parameters that generate a prescribed spatial profile of pseudomagnetic fields (PMFs) in graphene. But the method is general enough to accommodate a multitude of possible experimental parameters and conditions whereby deformations can be imparted to the graphene lattice, and complies, by design, with grapheneʼs elastic equilibrium and elastic compatibility constraints. As a result, it efficiently answers the inverse problem of determining the optimal values of a set of external or control parameters (such as substrate topography, sample shape, load distribution, etc) that result in a graphene deformation whose associated PMF profile best matches a prescribed Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.target. The ability to address this inverse problem in an expedited way is one key step for practical implementations of the concept of 2D systems with electronic properties strain-engineered to order. The general-purpose nature of this calculation strategy means that it can be easily applied to the optimization of other relevant physical quantities which directly depend on the local strain field, not just in graphene but in other 2D electronic membranes.2 New J. Phys. 16 (2014) 093044 G W Jones and V M Pereira

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Section: Resultsmentioning

confidence: 99%

Designing electronic properties of two-dimensional crystals through optimization of deformations

Jones¹,

Pereira²

2014

New J. Phys.

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“…Energy band gap in BLG nanoribbon and nanoflake could be controlled by substrate properties and the applied vertical electric field, so these structures could be used as a channel material in carbon-based transistors [6][7][8][9][10][11][12] . Moreover, several studies have been performed, both theoretically and experimentally, on transport properties in BLG structure [6][7][8][9][12][13][14][15][16][17] . Interestingly, BLG field-effect-transistors with high on/off current ratios at room temperature have been reported 9 .…”

Section: Introductionmentioning

confidence: 99%

Giant magnetoresistance in bilayer graphene nanoflakes

Farghadan

Farekiyan

2016

Solid State Communications

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Coherent spin transport through bilayer graphene (BLG) nanoflakes sandwiched between two electrodes made of single-layer zigzag graphene nanoribbon was investigated by means of Landauer-Buttiker formalism. Application of a magnetic field only on BLG structure as a channel produces a perfect spin polarization in a large energy region. Moreover, the conductance could be strongly modulated by magnetization of the zigzag edge of AB-stacked BLG, and the junction, entirely made of carbon, produces a giant magnetoresistance (GMR) up to 10 6 %. Intestinally, GMR and spin polarization could be tuned by varying BLG width and length. Generally, MR in a AB-stacked BLG strongly increases (decreases) with length (width).

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“…However, such a splitting has not been observed for the 2D-mode and does also not occur for the G-mode in the case of equibiaxial strain [87][88][89][90]. As such, externally applied strain appears as a highly suitable experimental knob [91][92][93] to further understand the role of nanometer-scale strain variations in determining the material's properties of high-quality graphene.…”

Section: Discussionmentioning

confidence: 99%

Interplay between nanometer-scale strain variations and externally applied strain in graphene

et al. 2016

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We present a molecular modeling study analyzing nanometer-scale strain variations in graphene as a function of externally applied tensile strain. We consider two different mechanisms that could underlie nanometer-scale strain variations: static perturbations from lattice imperfections of an underlying substrate and thermal fluctuations. For both cases we observe a decrease in the out-of-plane atomic displacements with increasing strain, which is accompanied by an increase in the in-plane displacements. Reflecting the nonlinear elastic properties of graphene, both trends together yield a nonmonotonic variation of the total displacements with increasing tensile strain. This variation allows us to test the role of nanometer-scale strain variations in limiting the carrier mobility of high-quality graphene samples.

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Transport in suspended monolayer and bilayer graphene under strain: A new platform for material studies

Cited by 21 publications

References 36 publications

Designing electronic properties of two-dimensional crystals through optimization of deformations

Designing electronic properties of two-dimensional crystals through optimization of deformations

Giant magnetoresistance in bilayer graphene nanoflakes

Interplay between nanometer-scale strain variations and externally applied strain in graphene

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