Dirac fermion optics and directed emission from single- and bilayer graphene cavities

Schrepfer, Jule-Katharina; Chen, Szu-Chao; Liu, Ming‐Hao; Richter, Klaus; Hentschel, Martina

doi:10.1103/physrevb.104.155436

Cited by 11 publications

(12 citation statements)

References 53 publications

(76 reference statements)

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“…Mesoscopic systems cover a broad range of devices and phenomena ranging from optical microcavity systems to electronic devices such as Dirac fermion optics in graphene systems [5]. Besides the coupling of microcavites, the presence of sources in another, related topic of interest closely related to coupling [6] and a tool to manipulate the system properties.…”

Section: Discussionmentioning

confidence: 99%

Mesoscopic optics in coupled microcavities

Hentschel,

Rodemund,

Sinzinger

2023

EPJ Web Conf.

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Deformed microdisc cavities possess versatile application potential ranging from microlasers to sensors. Here, we investigate arrays of several coupled microcavity resonators. The coupling interaction between the cavities induces a wide range of features that sensitively depend on, and therefore can be controlled via, the intercavity distance. We use semiclassical methods from mesoscopic optics to characterise the system and its dynamics in real and phase space using Husimi functions. Our findings can inspire novel optical devices such as supersensors or novel light sources.

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Section: Discussionmentioning

confidence: 99%

Mesoscopic optics in coupled microcavities

Hentschel,

Rodemund,

Sinzinger

2023

EPJ Web Conf.

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“…They can be uniquely characterized by their dispersion relation. In the case of electronic systems such as graphene-based materials [3], the Fermi surface provides the properties needed. The directions normal to the Fermi line or surface can be associated with propagation directions in momentum space.…”

Section: Lntroductionmentioning

confidence: 99%

Trajectory tracing dynamics in anisotropic microcavities

Hentschel,

Seemann

2023

EPJ Web Conf.

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Ray-wave correspondence has proven a powerful tool in mesoscopic optics, in particular in the description of deformed microdisc cavities with a versatile application potential ranging from microlasers to sensors. New material classes such as graphene-based systems have enriched the field by adding Dirac Fermion optics as well as anisotropic material properties as further system parameters. The trigonally warped dispersion relation in bilayer-graphene billiards generalizes the concept of birefringence and opens unconventional ways of trajectory control in the interplay of dispersion relation and the cavity geometry as we illustrate in this contribution.

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“…Point contacts in graphene are becoming an essential component in a number of electron optical application such as Dirac fermionic optics cavities [16] and electron collimation [3,70]. In particular, approaching the limit of quantum-toclassical correspondence of the focused electron waves [3] requires a point-like injector.…”

Section: A Truncated Cnt Gatementioning

confidence: 99%

“…Moreover, graphene can be smoothly modulated between electron and hole conduction, thus it is possible to create junctions between regions of opposite polarity. Thanks to this flexible control of the carrier density, electrostatically defined optical elements such as lenses [1][2][3][4][5], collimators [6,7], Fabry-Pérot [8][9][10] and Mach-Zehnder interferometers [11,12] or microcavities [13][14][15][16][17] are realizable in graphene and have been widely explored both theoretically and experimentally. Furthermore, unlike photons, carriers in graphene are charged, which opens up opportunities for applications beyond the regular optics, including manipulation with external magnetic field for transverse magnetic focusing [18][19][20] or Aharonov-Bohm effect [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Manipulating electron waves in graphene using carbon nanotube gating

Chiu,

Mreńca-Kolasińska,

Lei

et al. 2022

Preprint

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Graphene with its dispersion relation resembling that of photons offers ample opportunities for applications in electron optics. The spacial variation of carrier density by external gates can be used to create electron waveguides, in analogy to optical fiber, with additional confinement of the carriers in bipolar junctions leading to the formation of few transverse guiding modes. We show that waveguides created by gating graphene with carbon nanotubes (CNTs) allow obtaining sharp conductance plateaus, and propose applications in Aharonov-Bohm and two-path interferometers, and point-like source for injection of carriers in graphene. Other applications can be extended to Bernal-stacked or twisted bilayer graphene or two-dimensional electron gas. Thanks to their versatility, CNT-induced waveguides open various possibilities for electron manipulation in graphene-based devices.

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Dirac fermion optics and directed emission from single- and bilayer graphene cavities

Cited by 11 publications

References 53 publications

Mesoscopic optics in coupled microcavities

Mesoscopic optics in coupled microcavities

Trajectory tracing dynamics in anisotropic microcavities

Manipulating electron waves in graphene using carbon nanotube gating

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