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We report the inclusion of electron-electron correlation in the calculation of transport properties within an ab initio scheme. A key step is the reformulation of Landauer's approach in terms of an effective transmittance for the…

强关联电子 · 物理学 2009-11-10 A. Ferretti , A. Calzolari , R. Di Felice , F. Manghi , M. J. Caldas , M. Buongiorno Nardelli , E. Molinari

Effects of relative orientation of the molecules on electron transport in molecular devices are studied by non-equilibrium Green's function method based on density functional theory. In particular, two molecular devices, with the planer…

介观与纳米尺度物理 · 物理学 2009-11-11 Yan-Hong Zhou , Xiao-Hong Zheng , Ying Xu , Zhao Yang Zeng , Zhi Zeng

We consider resonant transmission through a finite-length quantum wire connected to leads via finite transparency junctions. The coherent electron transport is strongly modified by the Coulomb interaction. The low-temperature…

介观与纳米尺度物理 · 物理学 2009-11-13 N. B. Kopnin , Y. M. Galperin , V. M. Vinokur

Azulene (Az) is a non-alternating, aromatic hydrocarbon composed of a five-membered, electron-rich and a seven-membered, electron-poor ring; an electron distribution that provides intrinsic redox activity. By varying the attachment points…

介观与纳米尺度物理 · 物理学 2017-09-04 Florian Schwarz , Michael Koch , Georg Kastlunger , Heinz Berke , Robert Stadler , Koushik Venkatesan , Emanuel Loertscher

The effects of lattice distortion and chemical disorder on charge transport properties of two-terminal zigzag phosphorene nanoribbons (zPNRs), which shows resonant tunneling behavior under an electrical applied bias, are studied. Our…

介观与纳米尺度物理 · 物理学 2018-11-21 Zahra Nourbakhsh , Reza Asgari

The influence of the charging effects on the transport characteristics of a molecular wire bridging two metallic electrodes in the limit of weak contacts is studied by generalized Breit-Wigner formula. Molecule is modeled as a quantum dot…

化学物理 · 物理学 2009-11-10 Kamil Walczak

We develop a theory of electron transport through quantum dots that are weakly coupled to ferromagnetic leads. The theory covers both the linear and nonlinear transport regime, takes non-collinear magnetization of the leads into account,…

介观与纳米尺度物理 · 物理学 2009-11-10 Matthias Braun , Jürgen König , Jan Martinek

Using density functional theory and non-equilibrium Greens function technique, we performed theoretical investigations on the transport properties of several ZAZ SiNRs junctions,a similar kind of silicene molecules junction combined by…

材料科学 · 物理学 2016-01-07 Dace Zha , Changpeng Chen , Jinping Wu

The electron transport though ferromagnetic metal-superconducting hybrid devices is considered in the non-equilibrium Green's function formalism in the quasiclassical approximation. Attention if focused on the limit in which the exchange…

超导电性 · 物理学 2009-10-31 W. Belzig , Arne Brataas , Yu. V. Nazarov , Gerrit E. W. Bauer

Electronic properties of heterostructures in which a finite number of Mott-insulator layers are sandwiched by semi-infinite metallic leads are investigated by using the dynamical-mean-field method combined with the Keldysh Green's function…

强关联电子 · 物理学 2009-11-13 Satoshi Okamoto

The transport properties of a conduction junction model characterized by two mutually coupled channels that strongly differ in their couplings to the leads are investigated. Models of this type describe molecular redox junctions (where a…

介观与纳米尺度物理 · 物理学 2015-06-16 Alexander J. White , Agostino Migliore , Michael Galperin , Abraham Nitzan

Electron transport properties of a non-interacting mesoscopic ring sandwiched between two metallic electrodes are investigated by the use of Green's function formalism. We introduce a parametric approach based on the tight-binding model to…

介观与纳米尺度物理 · 物理学 2009-11-06 Santanu K. Maiti

We report an electron transport study of lithographically fabricated graphene nanoribbons of various widths and lengths at different temperatures. At the charge neutrality point, a length-independent transport gap forms whose size is…

介观与纳米尺度物理 · 物理学 2015-05-14 Melinda Y. Han , Juliana C. Brant , Philip Kim

We use the effective-mass approximation and the density-functional theory with the local-density approximation for modeling two-dimensional nano-structures connected phase-coherently to two infinite leads. Using the non-equilibrium Green's…

介观与纳米尺度物理 · 物理学 2009-11-10 Paula Havu , Ville Havu , Martti Puska , Risto Nieminen

The electrical transport properties of anodically grown TiO2 nanotubes was investigated. Amorphous nanotubes were anodically grown on titanium foil and transformed through annealing into the anatase phase. Amorphous and polycrystalline…

An analytic approach to the electron transport phenomena in molecular devices is presented. Analyzed devices are composed of organic molecules attached to the two semi-infinite electrodes. Molecular system is described within the…

介观与纳米尺度物理 · 物理学 2007-05-23 Kamil Walczak

A first-principle model is proposed to study the electrostatic properties of a double-gated silicon slab of nano scale in the framework of density functional theory. The applied gate voltage is approximated as a variation of the…

We explore electron transport through a quantum dot coupled to the source and drain charge reservoirs We trace the transition from the Coulomb blockade regime to Kondo regime in the electron transport through the dot occuring when we…

强关联电子 · 物理学 2008-10-24 Natalya A. Zimbovskaya

Epitaxial, n-type ZnO films grown by a laser molecular-beam epitaxy method were investigated by the temperature-dependent Hall-effect technique. The 300-K carrier concentration and mobility were about $n_s \sim 10^{16}$ cm$^{-3}$ and 440…

材料科学 · 物理学 2009-11-11 T. Makino , Y. Segawa , A. Tsukazaki , A. Ohtomo , M. Kawasaki

We present a generalized approach for computing electron conductance and I-V characteristics in multiterminal junctions from first-principles. Within the framework of Keldysh theory, electron transmission is evaluated employing an O(N)…

材料科学 · 物理学 2015-05-13 Kamal K. Saha , Wenchang Lu , J. Bernholc , Vincent Meunier