Plasmons in nanoscale and atomic-scale systems

Nagao, Tadaaki; Han, Gaorong; Hoang, Chung Vu; Wi, Jung‐Sub; Pucci, Annemarie; Weber, Daniel; Neubrech, Frank; Silkin, Viatcheslav M.; Enders, Dominik; Saitô, Osamu; Rana, Masud

doi:10.1088/1468-6996/11/5/054506

Cited by 49 publications

(41 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A new field of plasmon research has been opened recently by collective excitations of low-dimensional electron gases, called sheet plasmons [15,16], which have wavelengths that are typically three orders of magnitude shorter compared to photons of the same frequency. Thus THz plasmonics on the scale of a few nanometers becomes feasible.…”

mentioning

confidence: 99%

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

et al. 2016

View full text Add to dashboard Cite

Dimensional crossover is of high relevance to understanding real-world quasi-one-dimensional (1D) systems. Here we study the collective excitations, measured as plasmon dispersions in an electron energy loss experiment, in a tunable family of model systems, namely, Au chains on stepped Si(hhk) substrates, that allow variations of chain widths and interchain spacings. We indeed observe 1D-like dispersions, but with a significant influence of higher dimensions. Surprisingly, we find that it is not the interchain coupling but the width of the conduction channel, as confirmed by tunneling spectroscopy, that dominates the excitations. DOI: 10.1103/PhysRevB.93.161408 One-dimensional (1D) electronic systems have highly attractive properties such as quantization of conductance, extremes of electronic correlation manifested by spin-charge separation, charge and spin density waves [1,2], triplet superconductivity, and Luttinger liquid behavior [3][4][5]. Due to their inherent instability, however, structural embedding and understanding of the coupling to other dimensions is of supreme importance. Indeed, many 1D properties can still be observed in these quasi-1D systems [6][7][8][9][10]. In addition, these systems host a variety of instabilities with a wealth of associated phase transitions [11]. On the other hand, the excitation spectra of these systems and their dynamics are still largely unexplored, which is particularly true for collectively excited plasmonic states.Apart from these fundamental aspects, plasmons play an important role, e.g., in sensor technology [12], improvement of quantum efficiency in photovoltaic devices [13], and even in cancer research [14]. A new field of plasmon research has been opened recently by collective excitations of low-dimensional electron gases, called sheet plasmons [15,16], which have wavelengths that are typically three orders of magnitude shorter compared to photons of the same frequency. Thus THz plasmonics on the scale of a few nanometers becomes feasible.One-dimensional (1D) metallic wires and their plasmonic excitations would be ideal for directed energy transport on the nanoscale, since quasilinear dispersion is predicted, at least in the long wavelength limit [17], for these 1D plasmons. Such dispersions have indeed been found for regular arrays of atomic wires on insulating substrates [18][19][20]. Moreover, confinement effects in these metallic subunits on the surface lead to the formation of intersubband excitations [19][20][21].Before realizing such visions, several fundamental properties of these quasi-1D plasmons need to be clarified, comprising, in particular, the question of dimensional crossover, but also the correct treatment of many-body effects, electronic correlations, and Coulomb screening [22][23][24]. These open topics led to a partly unsatisfactory description of experimental results in the past [18,19,25]. * pfnuer@fkp.uni-hannover.de To address such fundamental aspects for 1D and 2D systems, the growth of various metals in the submonolayer regime on se...

show abstract

mentioning

confidence: 99%

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

et al. 2016

View full text Add to dashboard Cite

show abstract

“…74 It also would be interesting to investigate the influence of the ISP and I and II modes on the optical properties of thin films. Additionally, the lateral confinement (for instance, by formation of islands 75,76 ) of the strongly dispersing acoustic-like modes might have a strong effect on the light absorption in infrared range, as was recently suggested in the case of metallic nanoparticles 77 and demonstrated in the case of Ag bilayer nanodisks 58 and In atomic chains. 75 Varying slab thickness, material, and lateral size would introduce great possibilities in the ability to tune the plasmonic properties of such atomic-scale structures.…”

Section: Discussionmentioning

confidence: 79%

Low-energy plasmons in quantum-well and surface states of metallic thin films

et al. 2011

View full text Add to dashboard Cite

We studied low-energy plasmons in ultrathin films of silver in the thickness regimes where the surface states as well as quantum-well states must play significant roles. Realistic band structure was adopted for assessing the quantum-mechanical effect on the low-energy charge dynamics. In addition to the expected quasi-twodimensional plasmon mode, we find the modes that resemble an acoustic surface plasmon on semi-infinite metal surfaces and an additional plasmon mode related to the interband transitions between the two slab-split surface states. It is found that the dispersion of the latter mode is almost identical to the acoustic surface plasmon except the energy offset at small momenta values. The peaks in the surface response function related to interband transitions between the surfacelike states and bulklike states are identified as well. The present work elucidates the role of quantized electronic states and surface states on the plasmonic excitations in the ultimately thin films potentially used in the future nano-optics devices.

show abstract

“…However, due to the complicated quantum structure of the devices and systems exhibiting the plasmonic effect, formulating and solving theoretical problems related to the wide variety of plasmonic phenomena and processes is very difficult work. Therefore, although there has been significant attention towards the theoretical interpretation or explanation of the experimental data , there still exists a visible gap between the contents of the theoretical works [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] and the subjects of the experimental investigations [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63]. Moreover, the theoretical works are either based on simplified models of electron gas or on the phenomenological interaction Hamiltonians.…”

Section: Introductionmentioning

confidence: 99%

Quantum theory of plasmon energy spectra in electron gases of bulk metal and metallic nanostructures

Nguyễn

Nguyen

2014

Adv. Nat. Sci: Nanosci. Nanotechnol.

View full text Add to dashboard Cite

The present work is an attempt to formulate the quantum theory of plasmons in metallic structures starting from basic laws of electrodynamics and quantum theory as first principles. In particular, the dynamical integral equation of plasmon in any metallic structure was established. As a test, this general dynamical equation was used to determine the dispersion of plasmon in bulk metal and the obtained result completely agreed with the formula derived in conventional theories. Then the general method for determining the energy spectrum of plasmons in any metallic nanostructure was presented.

show abstract

Plasmons in nanoscale and atomic-scale systems

Cited by 49 publications

References 83 publications

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

Low-energy plasmons in quantum-well and surface states of metallic thin films

Quantum theory of plasmon energy spectra in electron gases of bulk metal and metallic nanostructures

Contact Info

Product

Resources

About