Spin-dependent tunneling time in strained graphene

Sattari, Farhad; Mirershadi, Soghra

doi:10.1016/j.spmi.2016.10.078

Superlattices and Microstructures

2016

DOI: 10.1016/j.spmi.2016.10.078

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Spin-dependent tunneling time in strained graphene

Farhad Sattari

Soghra Mirershadi

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Cited by 5 publications

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“…The adiabatic quantum charge pumping by time‐dependent potentials is one of the interesting aspect of quantum transport . In this way, various proposals for charge and spin pumping are presented in previous works . In a one‐dimensional insulator with a cyclic adiabatic evolution H ( k , t + T ) = H ( k , t ) the pumped charge is associate with the Chern number .…”

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confidence: 99%

Dynamical Strain‐Induced Charge Pumping in Monolayer Graphene

Farajollahpour¹,

Phirouznia²

2017

Physica Rapid Research Ltrs

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Emergence of high pseudo-magnetic field as a result of mechanical deformations is one of the intriguing characteristics of the graphene honeycomb structure. For a time-dependent nonuniform strain and in the context of Berry curvature approach, the topological charge pumping is studied theoretically. Calculations have been performed in time-momentum parametric space. Within the Berry curvature approach, it has been revealed that time-dependent deformations result in nonzero valley-dependent charge pumping in the gapped graphene when there is a population imbalance between the valleys. This indicates that the valley polarization can be measured by the amount of topological charge pumping in the system. Results also show that the strain can remove the valley degeneracy at nonzero Fermi energies. Therefore, population imbalance or valley polarization can be realized as a result of the external strain. Strain has been considered as gauge field that couples oppositely with two valleys of the Brillouin zone.

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mentioning

confidence: 99%

Dynamical Strain‐Induced Charge Pumping in Monolayer Graphene

Farajollahpour¹,

Phirouznia²

2017

Physica Rapid Research Ltrs

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Mechanical response of SiC sheet under strain

Drissi

Sadki

Kourra

2017

Materials Chemistry and Physics

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Influence of temperature on the modal behavior of monolayer graphene sheets

Tsiamaki

Katsareas

Anifantis

2018

Journal of Applied Physics

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In this work, the vibrational behavior of rectangular monolayer graphene sheets is predicted at different environmental temperatures. Graphene sheets are modeled according to their molecular structure via finite element analysis. Using molecular mechanics theory, the potential energy of graphene is expressed as temperature-dependent. The graphene interatomic interactions are simulated by spring elements, and the nodes of the model represent the carbon atoms. The carbon atom mass is considered in the assembly and solution of the vibrational problem. The temperature influence is introduced to the model because of its effect on the bond length and stiffness of the spring elements. The eigenvalue problem is solved using appropriate boundary conditions. The solution yields the frequencies and corresponding mode shapes of graphene for all temperatures, sheet dimensions, and orientations under the boundary conditions investigated. The results of this study demonstrate that the bending frequencies are not influenced by temperature, in contrast to the in-plane vibrations. The results demonstrate the accuracy of the proposed method compared with published data in the literature.

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Spin-dependent tunneling time in strained graphene

Cited by 5 publications

References 74 publications

Dynamical Strain‐Induced Charge Pumping in Monolayer Graphene

Dynamical Strain‐Induced Charge Pumping in Monolayer Graphene

Mechanical response of SiC sheet under strain

Influence of temperature on the modal behavior of monolayer graphene sheets

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