$1 billion R&amp;D spender emerges

Ward, Mike

doi:10.1038/376626b0

Cited by 18 publications

(30 citation statements)

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“…68 In particular, surface enhanced Raman spectroscopy (SERS) [69][70][71][72] in junctions, besides providing (complementary to IETS) information on molecular vibrations, allows for estimating bias-induced heating of electronic and vibrational degrees of freedom. 73,74 Tipenhanced Raman spectroscopy (TERS) 75,76 yields information on molecular structure. [77][78][79][80][81] Furthermore, optical emission in biased junctions was observed as biasinduced luminescence.…”

Section: Introductionmentioning

confidence: 99%

Green’s function methods for single molecule junctions

Cohen

Galperin

2020

J. Chem. Phys.

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We present a brief pedagogical review of theoretical Green's function methods applicable to open quantum systems out of equilibrium in general, and single molecule junctions in particular. We briefly describe experimental advances in molecular electronics, then discuss different theoretical approaches. We then focus on Green's function methods. Two characteristic energy scales governing the physics are many-body interactions within the junctions, and molecule-contact coupling. We therefore discuss weak interactions and weak coupling, as two limits that can be conveniently treated within, respectively, the standard nonequilibrium Green's function (NEGF) method and its many-body flavors (pseudoparticle and Hubbard NEGF). We argue that the intermediate regime, where the two energy scales are comparable, can in many cases be efficiently treated within the recently introduced superperturbation dual fermion approach. Finally, we review approaches for going beyond these analytically accessible limits, as embodied by recent developments in numerically exact methods based on Green's functions. arXiv:2001.06008v2 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Green’s function methods for single molecule junctions

Cohen

Galperin

2020

J. Chem. Phys.

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“…Electroluminescence allowed to visualize intra-molecular interactions [5,6], explore real space energy transfer [7], and probe charge fluctuations in biased molecular junctions [8]. Raman spectroscopy yields information on vibrational structure and electron flux induced heating of vibrational and electronic degrees of freedom in single-molecule junctions [9][10][11][12]. Recently, experimental measurements of ultra-strong light-matter interaction in single molecule cavities (so far without current) were reported in the literature [13,14].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of periodically driven open nonequilibrium quantum systems

Cabra

Franco

Galperin

2020

The Journal of Chemical Physics

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Characterization and control of matter by optical means is at the forefront of research both due to fundamental insights and technological promise. Theoretical modeling of periodically driven systems is a preprequisite to understanding and engineering nanoscale quantum devices for quantum technologies. Here, we develop a theory for transport and optical response of molecular junctions, open nonequilibrium quantum systems, under external periodic driving. Periodic driving is described using the Floquet theory combined with nonequilibrium Green's function description of the system. Light-matter interaction is modeled employing the self-consistent Born approximation. Generic three-level model is utilized to illustrate effect of the driving on optical and transport properties of junctions.arXiv:2001.03675v1 [cond-mat.mes-hall]

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“…Electron transport through a single-molecule junction can be understood in a similar way as through quantum dots, including electron-electron interactions [2] and/or quantum interference effects [3,4]. In addition, the vibrational degrees of freedom of a molecule play an important role [4][5][6], including, in particular, nonequilibrium effects such as current-induced vibrational excitation [4,[7][8][9][10][11][12][13][14][15][16][17]. This is in contrast to quantum dot systems [18], where phonon degrees of freedom are often considered as being part of the environment rather than as active degrees of freedom, and is associated to the small size and mass of a molecular conductor.…”

Section: Introductionmentioning

confidence: 99%

Vibrationally coupled electron transport in single‐molecule junctions: The importance of electron–hole pair creation processes

Härtle

Peskin

Thoss

2013

Physica Status Solidi (b)

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Vibrationally coupled electron transport through singlemolecule junctions is considered. Reviewing our recent theoretical work, we show that electron-hole pair creation processes represent the key to understand the vibrational excitation characteristic of a single-molecule contact. Moreover, these processes can lead to a number of interesting transport phenomena such as, for example, negative differential resistance, rectification, mode-selective vibrational excitation and a pronounced temperature dependence of the electrical current. Thus, electronhole pair creation processes are crucial to elucidate the basic mechanisms of vibrationally coupled electron transport through a single-molecule contact, despite the fact that these processes do not directly contribute to the electrical current that is flowing through the junction.

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$1 billion R&D spender emerges

Abstract: Committee has recommended the axing of funding for a research project which has revealed links between legislators and tobacco interests, and brought damaging internal tobacco industry documents to the attention of the public.

Cited by 18 publications

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Green’s function methods for single molecule junctions

Green’s function methods for single molecule junctions

Optical properties of periodically driven open nonequilibrium quantum systems

Vibrationally coupled electron transport in single‐molecule junctions: The importance of electron–hole pair creation processes

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