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An exact description of $\pi$ electrons based on the tight-binding model of graphene as an alternant, plane macromolecule is presented. The model molecule can contain an arbitrary number of benzene rings and has armchair- and zigzag-shaped…

介观与纳米尺度物理 · 物理学 2009-11-13 Alexander Onipko

We present a general framework for quantum interference (QI) between multiple, fundamentally different processes. Our framework reveals the importance of shaped input wavefunctions in enabling QI, and predicts unprecedented interactions…

量子物理 · 物理学 2023-10-10 J. Lim , Y. S. Ang , L. K. Ang , L. J. Wong

We study electron transport properties of some molecular wires and a unconventional disordered thin film within the tight-binding framework using Green's function technique. We show that electron transport is significantly affected by…

介观与纳米尺度物理 · 物理学 2009-06-29 Santanu K. Maiti

Based on the self-consistent $T$-matrix approximation, the quantum interference (QI) effect is studied with the diagrammatic technique in weakly-disordered two-dimensional crystals with nearly half-filled bands. In addition to the usual…

超导电性 · 物理学 2009-11-07 Y. H. Yang , D. Y. Xing , Y. G. Wang , M. Liu

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

In this thesis, I investigate the molecular electronic properties of molecular junctions formed from single molecules. I started my thesis by discusses the main theoretical methods using in this work density functional theory and the green…

介观与纳米尺度物理 · 物理学 2016-10-18 Eman Nader Almutib

The quantum interaction between molecules and electrode s material at molecules-electrode interfaces is a major ingredient in the electronic transport properties of organic junctions. Driven by the coupling strength between the two…

We provide a simple set of rules for predicting interference effects in off-resonant transport through single-molecule junctions. These effects fall in two classes, showing respectively an odd or an even number of nodes in the linear…

介观与纳米尺度物理 · 物理学 2014-09-12 Kim G. L. Pedersen , Mikkel Strange , Martin Leijnse , Per Hedegård , Gemma Solomon , Jens Paaske

We present density functional theory (DFT) based non-equilibrium Green's function (NEGF) calculations for the conductance through a nitrobenzene molecule, which is anchored by pyridil-groups to Au electrodes. This work is building up on…

材料科学 · 物理学 2013-05-29 Robert Stadler

A quantum circuit rule for combining quantum interference (QI) effects in the conductive properties of oligo(phenyleneethynylene) (OPE)-type molecules possessing three aromatic rings was investigated both experimentally and theoretically.…

If design principles for controlling quantum interference in single molecules could be elucidated and verified, then this will lay the foundations for exploiting such effects in nanoscale devices and thin-film materials.When the core of a…

介观与纳米尺度物理 · 物理学 2016-08-24 Sara Sangtarash , Hatef Sadeghi , Colin J. Lambert

We report on the single-molecule electronic and thermoelectric properties of strategically chosen anthracene-based molecules with anchor groups capable of binding to noble metal substrates, such as gold and platinum. Specifically, we study…

The realization of self-assembled molecular-electronic films, whose room-temperature transport properties are controlled by quantum interference (QI), is an essential step in the scale-up QI effects from single molecules to parallel arrays…

In our theoretical study where we combine a nonequilibrium Green's function (NEGF) approach with density functional theory (DFT) we investigate branched compounds containing ferrocene moieties in both branches which due to their metal…

介观与纳米尺度物理 · 物理学 2017-10-11 Xin Zhao , Georg Kastlunger , Robert Stadler

We measure electronic conductance through single conjugated molecules bonded to Au metal electrodes with direct Au-C covalent bonds using the scanning tunneling microscope based break-junction technique. We start with molecules terminated…

We study the quantum interference (QI) effects in three-terminal Andreev interferometers based on polyaromatic hydrocarbons (PAH's) under non-equilibrium conditions. The Andreev interferometer consists of a PAH coupled to two…

介观与纳米尺度物理 · 物理学 2020-04-23 Noel L. Plaszkó , Peter Rakyta , József Cserti , Andor Kormányos , Colin J. Lambert

We study coherent phonon transport through organic, \pi-conjugated molecules. Using first principles calculations and Green's function methods, we find that the phonon transmission function in cross-conjugated molecules, like meta-connected…

介观与纳米尺度物理 · 物理学 2015-06-16 Troels Markussen

We analyze quantum interference and decoherence effects in single-molecule junctions both experimentally and theoretically by means of the mechanically controlled break junction technique and density-functional theory. We consider the case…

介观与纳米尺度物理 · 物理学 2012-09-26 Stefan Ballmann , Rainer Härtle , Pedro B. Coto , Marcel Mayor , Mark Elbing , Martin R. Bryce , Michael Thoss , Heiko B. Weber

On-surface synthesis has paved the way towards the fabrication and characterization of conjugated carbon-based molecular materials that exhibit {\pi}-magnetism such as triangulenes. Aza-triangulene, a nitrogen-substituted derivative, was…

Electron transport is theoretically investigated in a molecular device made of anthracene molecule attached to the electrodes by thiol end groups in two different configurations (para and meta, respectively). Molecular system is described…

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