Nonlinear Quantum Electrodynamics in Dirac Materials

Keser, Aydın Cem; Lyanda-Geller, Yuli; Sushkov, O. P.

doi:10.1103/physrevlett.128.066402

Cited by 14 publications

(13 citation statements)

References 80 publications

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“…Techniques to account for strong external fields have been developed. The Heisenberg-Euler method is one of these 32 . That techniques is applicable only to fields which are not spatially varying, and is thus not appropriate to the present case.…”

Section: New Methods For Addressing Coulomb Screening In Bilayer Grap...mentioning

confidence: 99%

Patterned bilayer graphene as a tunable, strongly correlated system

Krix¹,

Sushkov²

2022

Preprint

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Recent observations of superconductivity in Moire graphene 1 have lead to an intense interest in that system, with subsequent studies revealing a more complex phase diagram including correlated insulators and ferromagnetic phases. Here we propose an alternate system, electrostatically patterned bilayer graphene (PBG), in which a supermodulation is induced via metallic gates rather than the moire effect. We show that, by varying either the gap or the modulation strength, bilayer graphene can be tuned into the strongly correlated regime. Further calculations show that this is not possible in monolayer graphene. We present a general technique for addressing Coulomb screening of the periodic potential and demonstrate that this system is experimentally feasible.

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Section: New Methods For Addressing Coulomb Screening In Bilayer Grap...mentioning

confidence: 99%

Patterned bilayer graphene as a tunable, strongly correlated system

Krix¹,

Sushkov²

2022

Preprint

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“…Hot spots with strong local-field enhancement in the subwavelength region play a dominant role in light–matter interactions, promoting revolutionary breakthroughs in various fields such as enhanced spectroscopy, − ultrasensitive sensors, − super-resolution optical imaging, , and enhanced transmission. , In the past few decades, metal nanostructures have received considerable attention owing to the supreme performance in electric-field enhancements in tightly confined spaces of nanoscale dimensions by exciting localized surface plasmons (LSPs) or surface plasmon polaritons (SPPs) . However, high intrinsic absorption losses and associated local heating of plasmonic nanostructures severely hinder their application in various scenarios. − Additionally, the optical response in metal plasmonic nanostructures at optical frequencies is mostly mediated by the electric component of the electromagnetic field with the magnetic component usually being considered negligible.…”

Section: Introductionmentioning

confidence: 99%

Controlled Electric and Magnetic Hot Spots in All-Dielectric Metasurfaces with High-Q Resonances

Yang,

He,

Jiang

et al. 2023

J. Phys. Chem. C

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The precise control over the locations of hot spots in a nanostructured ensemble is of great importance in enhanced spectroscopy, super-resolution optical imaging, sensors, slow light, and beam-steering devices. However, for all-dielectric multiparticle configurations, the locations of hot spots are difficult to predict due to the complex coupling of optical resonance modes. In this work, theoretical simulations based on all-dielectric metasurfaces with high-Q resonances predict that the locations of hot spots can be efficiently controlled in the nanorod–nanorod gaps or in the nanorod interior by suppressing or promoting specific-mode coupling effects in a specific polarization state of incident light. These findings offer an avenue to realize high-performance filters, sensors, and modulators for prompting applications.

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“…This success is based on the fact that phenomena appearing in different systems are unified by common physical mechanisms [1,2]. An illustrative example arises when one considers Weyl and Dirac semimetals, where it was shown in [3] that quantum vacuum non-linear effects contribute to the experimentally observed high field magnetization. These effects have their origin in the wellknown result due to Heisenberg and Euler [4].…”

Section: Introductionmentioning

confidence: 99%

“…Inspired by these observations, the purpose of this paper is to further elaborate on the physical content of the non-linear one-loop corrected effective electrodynamics (ED) discussed in [3]. Of special interest will be to consider the non-linear ED for Dirac materials in the familiar language of standard quantum field theory.…”

Section: Introductionmentioning

confidence: 99%

A Dirac-material-inspired non-linear electrodynamic model

Neves,

Gaete,

Ospedal

et al. 2023

J. Phys. A: Math. Theor.

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We propose and study the properties of a non-linear electrodynamics that emerges inspired on the physics of Dirac materials. This new electrodynamic model is an extension of the one-loop corrected non-linear eﬀective Lagrangian computed in the work of ref. [3]. In the particular regime of a strong magnetic and a weak electric ﬁeld, it reduces to the photonic non-linear model worked out by the authors of ref. [3]. We pursue our investigation of the proposed model by analyzing properties of the permittivity and permeability tensors, the energy- momentum tensor and wave propagation eﬀects in presence of a uniform magnetic background. It is shown that the electrodynamics here presented exhibits the vacuum birefringence phenomenon. Subsequently, we calculate the lowestorder modiﬁcations to the interaction energy, considering still the presence of a uniform external magnetic ﬁeld. Our analysis is carried out within the framework of the gauge-invariant but path-dependent variables formalism. The calculation reveals a screened Coulomb-like potential with an eﬀective electric charge that runs with the external magnetic ﬁeld but, as expected for Dirac-type materials, the screening disappears whenever the external magnetic ﬁeld is switched oﬀ.

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Nonlinear Quantum Electrodynamics in Dirac Materials

Cited by 14 publications

References 80 publications

Patterned bilayer graphene as a tunable, strongly correlated system

Patterned bilayer graphene as a tunable, strongly correlated system

Controlled Electric and Magnetic Hot Spots in All-Dielectric Metasurfaces with High-Q Resonances

A Dirac-material-inspired non-linear electrodynamic model

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