Harnessing ultraconfined graphene plasmons to probe the electrodynamics of superconductors

Costa, A. T.; Gonçalves, P. A. D.; Basov, D. N.; Mortensen, N. Asger; Peres, N. M. R.

doi:10.1073/pnas.2012847118

Cited by 16 publications

(27 citation statements)

References 65 publications

(129 reference statements)

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“…As we shall see in the next subsection, this can even be extended to new explorations of atomic-scale properties beyond the jellium picture of metals. Finally, the use of graphene as a probe of nearby electrodynamics was recently even suggested as a possible avenue for explorations beyond the common metallic state in a correlated matter [359][360][361].…”

Section: Graphene Plasmonsmentioning

confidence: 99%

Mesoscopic electrodynamics at metal surfaces

Mortensen

2021

Nanophotonics

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Plasmonic phenomena in metals are commonly explored within the framework of classical electrodynamics and semiclassical models for the interactions of light with free-electron matter. The more detailed understanding of mesoscopic electrodynamics at metal surfaces is, however, becoming increasingly important for both fundamental developments in quantum plasmonics and potential applications in emerging light-based quantum technologies. The review offers a colloquial introduction to recent mesoscopic formalism, ranging from quantum-corrected hydrodynamics to microscopic surface-response formalism, offering also perspectives on possible future avenues.

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Section: Graphene Plasmonsmentioning

confidence: 99%

Mesoscopic electrodynamics at metal surfaces

Mortensen

2021

Nanophotonics

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“…Our results also highlight that AGPs can be extremely sensitive probes for nanometrology as plasmon rulers, while simultaneously underscoring the importance of incorporating quantum response in the characterization of such rulers at (sub)nanometric scales. Finally, the theory introduced here further suggests additional directions for exploiting AGP's high-sensitivity, e.g., to explore the physics governing the complex electron dynamics at the surfaces of superconductors 43 and other strongly correlated systems.…”

Section: Discussionmentioning

confidence: 99%

Quantum surface-response of metals revealed by acoustic graphene plasmons

et al. 2021

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A 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.

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“…We remark that the electrodynamic properties of nanopatterned superconductors, and their exploitation in technological applications and device design, are attracting an ever- increasing interest (for recent examples, see in [ 35 , 36 ]). We think that a better understanding of situations in which the nanopatterning may be random (or self-organized), like the case we are considering, can lead to the manipulation and technological exploitation of superconductors with disorder at the nanoscale.…”

Section: Discussionmentioning

confidence: 99%

Finite-Frequency Dissipation in Two-Dimensional Superconductors with Disorder at the Nanoscale

2021

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Two-dimensional superconductors with disorder at the nanoscale can host a variety of intriguing phenomena. The superconducting transition is marked by a broad percolative transition with a long tail of the resistivity as function of the temperature. The fragile filamentary superconducting clusters, forming at low temperature, can be strengthened further by proximity effect with the surrounding metallic background, leading to an enhancement of the superfluid stiffness well below the percolative transition. Finite-frequency dissipation effects, e.g., related to the appearance of thermally excited vortices, can also significantly contribute to the resulting physics. Here, we propose a random impedance model to investigate the role of dissipation effects in the formation and strengthening of fragile superconducting clusters, discussing the solution within the effective medium theory.

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Harnessing ultraconfined graphene plasmons to probe the electrodynamics of superconductors

Cited by 16 publications

References 65 publications

Mesoscopic electrodynamics at metal surfaces

Mesoscopic electrodynamics at metal surfaces

Quantum surface-response of metals revealed by acoustic graphene plasmons

Finite-Frequency Dissipation in Two-Dimensional Superconductors with Disorder at the Nanoscale

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