scholarly journals Quantum surface-response of metals revealed by acoustic graphene plasmons

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
P. A. D. Gonçalves ◽  
Thomas Christensen ◽  
Nuno M. R. Peres ◽  
Antti-Pekka Jauho ◽  
Itai Epstein ◽  
...  
Keyword(s):  
Low Frequency ◽  
Chemical Processes ◽  
Electromagnetic Response ◽  
Electron Systems ◽  
Material Interfaces ◽  
Metal Structures ◽  
Surface Response ◽  
Electromagnetic Interactions ◽  
Quantitative Understanding ◽  
Graphene Plasmons

AbstractA quantitative understanding of the electromagnetic response of materials is essential for the precise engineering of maximal, versatile, and controllable light–matter interactions. Material surfaces, in particular, are prominent platforms for enhancing electromagnetic interactions and for tailoring chemical processes. However, at the deep nanoscale, the electromagnetic response of electron systems is significantly impacted by quantum surface-response at material interfaces, which is challenging to probe using standard optical techniques. Here, we show how ultraconfined acoustic graphene plasmons in graphene–dielectric–metal structures can be used to probe the quantum surface-response functions of nearby metals, here encoded through the so-called Feibelman d-parameters. Based on our theoretical formalism, we introduce a concrete proposal for experimentally inferring the low-frequency quantum response of metals from quantum shifts of the acoustic graphene plasmons dispersion, and demonstrate that the high field confinement of acoustic graphene plasmons can resolve intrinsically quantum mechanical electronic length-scales with subnanometer resolution. Our findings reveal a promising scheme to probe the quantum response of metals, and further suggest the utilization of acoustic graphene plasmons as plasmon rulers with ångström-scale accuracy.

Mapping of induced polarization using natural fields

Geophysics ◽  
2001 ◽  
Vol 66 (1) ◽  
pp. 137-147 ◽  
Author(s):  
Erika Gasperikova ◽  
H. Frank Morrison
Keyword(s):  
Electric Field ◽  
Surrounding Medium ◽  
Low Frequency ◽  
Induced Polarization ◽  
The Body ◽  
Electromagnetic Response ◽  
Frequency Dependent ◽  
Finite Body ◽  
Electric Field Profile ◽  
Measured Response

The observed electromagnetic response of a finite body is caused by induction and polarization currents in the body and by the distortion of the induction currents in the surrounding medium. At a sufficiently low frequency, there is negligible induction and the measured response is that of the body distorting the background currents just as it would distort a direct current (dc). Because this dc response is not inherently frequency dependent, any observed change in response of the body for frequencies low enough to be in this dc limit must result from frequency‐dependent conductivity. Profiles of low‐frequency natural electric (telluric) fields have spatial anomalies over finite bodies of fixed conductivity that are independent of frequency and have no associated phase anomaly. If the body is polarizable, the electric field profile over the body becomes frequency dependent and phase shifted with respect to a reference field. The technique was tested on data acquired in a standard continuous profiling magnetotelluric (MT) survey over a strong induced polarization (IP) anomaly previously mapped with a conventional pole‐dipole IP survey. The extracted IP response appears in both the apparent resistivity and the normalized electric field profiles.

Quantum Surface-Response of Metals Probed by Graphene Plasmons

2021 ◽  
Author(s):  
P. A. D. Goncalves ◽  
T. Christensen ◽  
N. M. R. Peres ◽  
A. P. Jauho ◽  
I. Epstein ◽  
...  
Keyword(s):  
Surface Response ◽  
Graphene Plasmons

Effect of fabrication method on the structure and electromagnetic response of carbon nanotube/polystyrene composites in low-frequency and Ka bands

2014 ◽  
Vol 102 ◽  
pp. 59-64 ◽  
Author(s):  
O.V. Sedelnikova ◽  
M.A. Kanygin ◽  
E.Yu. Korovin ◽  
L.G. Bulusheva ◽  
V.I. Suslyaev ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Low Frequency ◽  
Electromagnetic Response ◽  
Fabrication Method

scholarly journals Toroidal Dipolar Response in a Metamaterial

Science ◽  
2010 ◽  
Vol 330 (6010) ◽  
pp. 1510-1512 ◽  
Author(s):  
T. Kaelberer ◽  
V. A. Fedotov ◽  
N. Papasimakis ◽  
D. P. Tsai ◽  
N. I. Zheludev
Keyword(s):  
Experimental Evidence ◽  
Parity Violation ◽  
Particle Physics ◽  
Direct Evidence ◽  
Classical Electrodynamics ◽  
Electromagnetic Response ◽  
Direct Experimental Evidence ◽  
Electromagnetic Interactions ◽  
Naturally Occurring

Toroidal multipoles are fundamental electromagnetic excitations different from those associated with the familiar charge and magnetic multipoles. They have been held responsible for parity violation in nuclear and particle physics, but direct evidence of their existence in classical electrodynamics has remained elusive. We report on the observation of a resonant electromagnetic response in an artificially engineered medium, or metamaterial, that cannot be attributed to magnetic or charge multipoles and can only be explained by the existence of a toroidal dipole. Our direct experimental evidence of the toroidal response brings attention to the often ignored electromagnetic interactions involving toroidal multipoles, which could be present in naturally occurring systems, especially at the macromolecule level, where toroidal symmetry is ubiquitous.

The electromagnetic response of an inhomogeneous layered earth—A general one‐dimensional approach

Geophysics ◽  
1985 ◽  
Vol 50 (3) ◽  
pp. 434-442 ◽  
Author(s):  
V. Bezvoda ◽  
K. Segeth
Keyword(s):  
Transition Layer ◽  
Model Problem ◽  
Low Frequency ◽  
Electromagnetic Response ◽  
Dimensional Approach ◽  
Initial Value ◽  
One Dimensional ◽  
Very Low Frequency ◽  
The Third ◽  
Variable Conductivity

The electromagnetic response is studied for a model three‐layer earth formed by constant conductivity in the first and the third layers and conductivity varying with depth in the second layer (i.e., the inhomogeneous transition layer). A generalization to the case of many constant or variable conductivity layers is presented, too. The model problem is addressed by numerically solving an initial value problem for an ordinary differential equation for the inhomogeneous transition layer. The applicability of the procedure proposed, which is limited by the numerical method used, is discussed. As an illustration, the computed apparent resistivities and phases are compared with the results of Kao and Rankin (1980). The technique presented is applied to the computation of the response in the very‐low frequency (VLF) method. Application to other methods employing the plane wave is similar.

Probing the quantum surface-response of materials using ultraconfined graphene plasmons

2021 ◽  
Author(s):  
Paulo André Gonçalves ◽  
Thomas Christensen ◽  
Nuno Peres ◽  
Antti-Pekka Jauho ◽  
Itai Epstein ◽  
...  
Keyword(s):  
Surface Response ◽  
Graphene Plasmons
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