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We used a complete tight-binding band structure of graphene nanoribbon to obtain, for the first time, analytical techniques for observing photon assisted transport, and dynamic localization of electrons in the graphene nanoribbons. When the…

材料科学 · 物理学 2012-02-17 M. Rabiu , S. Y. Mensah , S. S. Abukari

We present a kinetic equation approach to investigate dc transport properties of graphene in the diffusive regime considering long-range electron-impurity scattering. In our study, the effects of interband correlation (or polarization) on…

材料科学 · 物理学 2009-11-13 S. Y. Liu , X. L. Lei , Norman J. M. Horing

We report first-principles calculations of electron-phonon coupling in bilayer graphene and the corresponding contribution to carrier scattering. At the phonon $\Gamma$ point, electrons with energies less than 200 meV are scattered…

介观与纳米尺度物理 · 物理学 2020-07-01 Yijun Ge , Timothy S. Fisher

This study investigates optical activity and quantum transport in twisted bilayer graphene (TBG) systems, demonstrating that the former results from spatial dispersion effects. The transfer matrix method is used to solve the propagation of…

介观与纳米尺度物理 · 物理学 2023-05-31 S. Ta Ho , V. Nam Do

We report here a general theory describing photoelectron transportation dynamics in GaAs semiconductor photocathodes. Gradient doping is incorporated in the model through the inclusion of directional carrier drift. The time-evolution of…

应用物理 · 物理学 2021-09-29 Rui Zhou , Hemang Jani , Yijun Zhang , Yunsheng Qian , Lingze Duan

Using the semi-classical Boltzmann theory, we calculate the conductivity as function of the carrier density. As usually, we include the scattering from charged impurities, but conclude that the estimated impurity density is too low in order…

介观与纳米尺度物理 · 物理学 2009-11-13 T. Stauber , N. M. R. Peres , F. Guinea

Quantum transport calculations describing electron scattering off an extended line defect in graphene are presented. The calculations include potentials from local magnetic moments recently predicted to exist on sites adjacent to the line…

介观与纳米尺度物理 · 物理学 2012-05-18 Daniel Gunlycke , Carter T. White

We theoretically investigate the transport properties of a weak coherent input field scattered by an ensemble of $\Lambda$-type atoms coupled to a one-dimensional photonic crystal waveguide. In our model, the atoms are randomly located in…

量子物理 · 物理学 2018-08-15 Guo-Zhu Song , Ewan Munro , Wei Nie , Leong-Chuan Kwek , Fu-Guo Deng , Gui-Lu Long

The electronic structure of pentacene decorated with dipole groups (d-pentacene) and adsorbed onto a graphene substrate has been studied within the density functional theory. Three reference configurations have been considered, namely the…

材料科学 · 物理学 2017-01-02 M. Wawrzyniak-Adamczewska , M. Wierzbowska , J. J. Melendez

In this review, we provide an account of the recent progress in understanding electronic transport in disordered graphene systems. Starting from a theoretical description that emphasizes the role played by band structure properties and…

介观与纳米尺度物理 · 物理学 2015-05-19 Eduardo R. Mucciolo , Caio H. Lewenkopf

Graphene field-effect transistors with Co contacts as source and drain electrodes show anomalous distorted transfer characteristics. The anomaly appears only in short-channel devices (shorter than approximately 3 micrometers) and originates…

材料科学 · 物理学 2008-10-20 Ryo Nouchi , Masashi Shiraishi , Yoshishige Suzuki

In this paper conceptual points regarding electrons elastic (Kapitza-Dirac effect) and inelastic diffraction effect on the different type slowed electromagnetic wave structures/light gratings are considered. From the unified point of view…

光学 · 物理学 2016-09-21 H. K. Avetissian

Graphene is a promising candidate for optoelectronic applications such as photodetectors, terahertz imagers, and plasmonic devices. The origin of photoresponse in graphene junctions has been studied extensively and is attributed to either…

介观与纳米尺度物理 · 物理学 2013-01-30 Marcus Freitag , Tony Low , Fengnian Xia , Phaedon Avouris

We perform a phenomenological analysis of the problem of the electronic doping of a graphene sheet by deposited transition metal atoms, which aggregate in clusters. The sample is placed in a capacitor device such that the electronic doping…

Two-dimensional (2D) crystals, such as graphene, hexagonal boron nitride and transitional metal dichalcogenides, have attracted tremendous amount of attention over the past decade due to their extraordinary thermal, electrical and optical…

材料科学 · 物理学 2017-02-16 Y. Zhao , Z. Wan , U. Hetmaniuk , M. P. Anantram

Using a semi-classical approach and input from experiments on the conductivity of graphene, we determine the electronic density dependence of the electronic transport coefficients -- conductivity, thermal conductivity and thermopower -- of…

介观与纳米尺度物理 · 物理学 2009-11-13 N. M. R. Peres , J. M. B. Lopes dos Santos , T. Stauber

We reveal a dramatic departure of electron thermodiffusion in solids relative to the commonly accepted picture of the ideal free-electron gas model. In particular, we show that the interaction with the lattice and impurities, combined with…

介观与纳米尺度物理 · 物理学 2020-10-28 Deng Pan , Hongxing Xu , F. Javier García de Abajo

We show that graphene deposited on a substrate has a non-negligible density of atomic scale defects. This is evidenced by a previously unnoticed D peak in the Raman spectra with intensity of about 1% with respect to the G peak. We evaluated…

介观与纳米尺度物理 · 物理学 2010-10-15 Z. H. Ni , L. A. Ponomarenko , R. R. Nair , R. Yang , S. Anissimova , I. V. Grigorieva , F. Schedin , Z. X. Shen , E. H. Hill , K. S. Novoselov , A. K. Geim

We present a microscopic explanation of the controversially discussed transient negative differential transmission observed in degenerate optical pump-probe measurements in graphene. Our approach is based on the density matrix formalism…

介观与纳米尺度物理 · 物理学 2015-06-19 Faris Kadi , Torben Winzer , Ermin Malic , Andreas Knorr

We comment on the latest paper [K.-H. Ding, Z.-G. Zhu, and J. Berakdar, J. Phys.: Condens. Matter 24, 266003 (2012)].

介观与纳米尺度物理 · 物理学 2012-12-04 Y. Zhou , M. W. Wu