Electromagnetic Response of Broken-Symmetry Nanoscale Clusters

Grigorenko, Ilya; Haas, Stephan; Levi, A. F. J.

doi:10.1103/physrevlett.97.036806

Cited by 26 publications

(35 citation statements)

References 16 publications

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“…Many subsequent theoretical calculation [7][8][9][10][11][24][25][26] confirmed the presence of the collective plasmon mode in the confined one-dimensional electronic systems of a few atoms. Theoretical studies of plasmon excitations are mostly done via calculating the dipole response [8][9][10][11] and other characteristic responses [24][25][26] under applying an external field, and the excitations are indicated by the corresponding response resonances. One may wonder whether the modes predicted in this way are dependent on the applied external fields.…”

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confidence: 99%

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Quadrupole plasmon excitations in confined one-dimensional systems

Wu¹,

Yu²,

Xue³

et al. 2014

EPL

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The existence and nature of a new mode of electronic collective excitations (quadrupole plasmons) in confined one-dimensional electronic systems have been predicted by an eigen-equation method. The eigen-equation based on the time-dependent density-functional theory is presented for calculating the collective excitations in confined systems. With this method, all modes of collective excitations in the 1D systems may be found out. These modes include dipole plasmons and quadrupole plasmons. The dipole plasmon mode corresponds to the antisymmetric oscillation of induced charge, and can be shown as a resonance of the dipole response. In the quadrupole plasmon modes, the induced charge distribution is symmetric, and the dipole response vanishes.The motion of the electrons in the quadrupole modes is similar to the vibration of atoms in the breathing mode of phonons. This type of plasmons can be shown as a resonance of the quadrupole response, and has to be excited by al non-uniform field. * Electronic address: apybyu@hnu.edu.cn.

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“…We believe that the new mode of collective excitations will exist in the atomic chain systems in Ref. [8][9][10][11][24][25][26].…”

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confidence: 99%

Quadrupole plasmon excitations in confined one-dimensional systems

Wu¹,

Yu²,

Xue³

et al. 2014

EPL

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“…Most of the existing studies have used either classical or simplified jellium models. [18][19][20][21] Recently, the importance of quantummechanical effects in the optical response of nanoparticles near touching contact has been pointed out. 22,23 Even for nanoparticles with radii in the tens of nanometers, the optical response is significantly affected when the separation between the nanoparticles is below 1 nm.…”

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Molecular orbital view of the electronic coupling between two metal nanoparticles

et al. 2010

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The electronic coupling between metal nanoparticles is responsible for intriguing new phenomena observed when the particles are near touching contact, which is exemplified by recent investigations of nanoparticle dimers. However, little is known about the role of the molecular orbitals of the nanoparticle dimers. The expectation is that the physics and chemistry of the system must be reflected in the orbitals that control the bonding at touching contact. This expectation is borne out in the present investigation in which we present a comprehensive theoretical study based on density-functional theory of the electronic coupling between two silver nanoparticles. We explain our findings by studying the molecular orbitals of the dimers as a function of the separation and relative orientation between the nanoparticles. We show that as the nanoparticles approach each other a bond-forming step takes place, and that the strength of the hybridization is a key element to determine various properties of the system. We find that the relative orientation between the nanoparticles plays an important role in determining the strength of the coupling which can be visualized by the spatial distribution of the highest occupied molecular orbitals. Moreover, the strength of the coupling will in turn determine the ease of their transition to the nonlinear dielectric-response regime. This effect allows for the tunability of the electronic coupling and magnetic moment of the dimer. Our findings are essential for understanding and tailoring desired physical and chemical properties of closely aggregated nanoparticles relevant for applications such as surface-enhanced Raman scattering and quantum transport in molecular devices.

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“…Using Eq. (1) we calculate the induced electric field E ind (r, ω) in the system within linear response theory [9]. The effect of the presence of a molecule is modeled by a potential which is added to the effective trapping potential in the nanostructure V mol (r) = −A exp(−B|r−r 0 | 2 ), where r 0 is the position of the molecule.…”

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Optimal control of the local electromagnetic response of nanostructured materials: Optimal detectors and quantum disguises.

Grigorenko¹,

Rabitz²,

Balatsky³

2009

Applied Physics Letters

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We consider the problem of optimization of an effective trapping potential in a nanostructure with a quasi-one-dimensional geometry. The optimization is performed to achieve certain target optical properties of the system. We formulate and solve the optimization problem for a nanostructure that serves either as a single molecule detector or as a "quantum disguise" for a single molecule.The rapid advance in fabrication techniques makes it possible to control the composition and geometry of nanostructured systems and materials on atomic scales [1]. One of the most interesting and challenging problems in modern nanoscience is how to utilize these fabrication capabilities to control the interaction of electromagnetic fields with nanostructured media. A successful solution to this problem would make possible the design of, for example, high energy density storage applications, or multifunctional nanophotonic materials with predefined prop-There is, in general, a complex relationship between the effective electron trapping potential in a nanostructure and the nanostructure's optical properties. One can usually solve this problem for a chosen geometry and structure of the system, thus for a given trapping potential. However, the inverse problem to find an optimal geometry of the nanostructure to attain desired optical properties seems much more complicated. In particular, the matter-field interaction becomes complex in the quantum limit of very small nanostructures, containing only a few electrons. Quantum mechanical corrections and the non-locality of the electromagnetic response become significant for system sizes comparable to a typical electron wavelength. This condition may be satisfied for such small objects as quantum dots, or for the next generation of microchips [3]. For example, for the semiconductor GaAs with a doping level of 10 18 cm −3 and effective electron mass m * e = 0.07 × m e , the Fermi wavelength λ F ≈ 20nm is on the length scale currently available in microchip design. Thus, the problem has both fundamental and applied significance, and there is a strong demand for methods to efficiently explore the optimal design of quantum nanoscale devices.A systematic approach to the theoretical analysis of optimal design of potentials in quantum scattering in semiconductor nanodevices was first developed in [4]. Twelve years later, an optimal design problem with similar objectives was considered in [5]. In [6] a simple tightbinding model was considered in two dimensions with the aim of fitting a target density of states, and as a result, also describing the basic response properties of the system. Another interesting example of inverse band structure engineering was considered for nitrogen impurities in GaP [7].One of the potential applications of optimal design of nanostructures is to the engineering of efficient single molecule detectors. Single molecule sensing by means of optical excitation is receiving increasing attention [8]. In this work we will demonstrate that with the help of quantum design it is ...

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Electromagnetic Response of Broken-Symmetry Nanoscale Clusters

Cited by 26 publications

References 16 publications

Quadrupole plasmon excitations in confined one-dimensional systems

Quadrupole plasmon excitations in confined one-dimensional systems

Molecular orbital view of the electronic coupling between two metal nanoparticles

Optimal control of the local electromagnetic response of nanostructured materials: Optimal detectors and quantum disguises.

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