Graphene closer to fruition

Torres, Jaime A.; Kaner, Richard B.

doi:10.1038/nmat3925

Cited by 25 publications

(14 citation statements)

References 11 publications

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“…Organic semiconductors however comprise the broadest class of strongly coupled materials developed to date and include molecular dyes, crystalline organic molecules, oligofluorenes, and conjugated polymers . Owing to the high quantum yield, large dipole moment of optical transitions and high‐binding energy of excitons, organic semiconductors have permitted the physics and applications of polaritonics to be explored at room temperature .…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Broadband Polariton Lasing from a Dye‐Filled Microcavity

Sannikov

Yagafarov

Georgiou

et al. 2019

Advanced Optical Materials

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GaAs-based microcavities. [2] However, the applications of III-V and II-VI inorganic semiconductors in polaritonics are relatively limited due to the challenging growth techniques required to create wide bandgap semiconductors together with the necessity of using cryogenic temperatures to create Wannier-Mott excitons. [3,4] Organic semiconductors however comprise the broadest class of strongly coupled materials developed to date and include molecular dyes, crystalline organic molecules, oligofluorenes, and conjugated polymers. [5][6][7][8][9][10][11] Owing to the high quantum yield, large dipole moment of optical transitions and high-binding energy of excitons, organic semiconductors have permitted the physics and applications of polaritonics to be explored at room temperature. [12,13] Polariton lasing is one of the most distinctive nonlinear phenomena related to the collective behavior of exciton polaritons. In contrast to conventional photon lasers, a polariton laser does not necessitate the electronic inversion of population, but is instead driven by a stimulated relaxation to a coherent state during the process of condensation to the ground polariton state. This process has allowed polariton lasers to exhibit significantly lower thresholds compared to photon lasers that have been fabricated using the same device configuration. [14,15] Recently, we demonstrated polariton lasing in the yellow part of the spectrum in an organic microcavity containing the molecular dye bromine-substituted boron-dipyrromethene (BODIPY-Br). [5] In the present paper, we explore the incorporation of another molecular dye of the BODIPY family, namely BODIPY-G1 fluorescent dye, into a microcavity and show that by incorporating a wedged cavity-layer configuration, we can achieve strong coupling over a broad range of exciton-photon detuning conditions. Such structures allow us to controllably access different cavity lengths and thus select the energy of the ground polariton state. We then use this approach to provide evidence of polariton lasing over a broad range of wavelengths (>30 nm) utilizing a single material system.

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Section: Introductionmentioning

confidence: 99%

Room Temperature Broadband Polariton Lasing from a Dye‐Filled Microcavity

Sannikov

Yagafarov

Georgiou

et al. 2019

Advanced Optical Materials

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“…Magnons, or spin-wave quanta, constitute propagating disturbances in a correlated array of magnetic spins [12,13], and whose modes and dynamics are being intensely studied in a variety of systems in the pursuit of both fundamental many-body states [14], and practical information technology [15,16]. While the manifestation of spin-waves in magnetic media is ubiquitous, their room-temperature quantum condensation is a recently observed phenomenon, and presents a compelling platform for exploring many-body and macroscopic quantum dynamics at room temperature [4,[17][18][19]. Given the central role of spin-lattice relaxation, it is compelling to consider their manifestation and condensation in magnetically doped crystals with long-lived spin systems, and for which additional degrees of spin manipulation may be available.…”

Section: Introductionmentioning

confidence: 99%

Magnon condensation in a dense nitrogen-vacancy spin ensemble

El-Ella

2019

Phys. Rev. B

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The feasibility of creating a Bose-Einstein condensate of magnons using a dense ensemble of nitrogen-vacancy spin defects in diamond is investigated. Through assessing a density-dependent spin exchange interaction strength and the magnetic phase transition temperature (Tc) using the Sherrington-Kirkpatrick model, the minimum temperature-dependent concentration for magnetic self-ordering is estimated. For a randomly dispersed spin ensemble, the calculated average exchange constant exceeds the average dipole interaction strengths for concentrations approximately greater than 70 ppm, while Tc is estimated to exceed 10 mK beyond 90 ppm, reaching 300 K at a concentration of approximately 450 ppm. On this basis, the existence of dipole-exchange spin waves and their plane-wave dispersion is postulated and estimated using a semiclassical magnetostatic description. This is discussed along with a Tc-based estimate of the four-magnon scattering rate, which indicates magnons and their condensation may be detectable in thin films for concentrations greater than 90 ppm.

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“…[16][17][18][19][20] Of late years, the enormous achievements in synthesis of defectless graphene make them easier to be commercialized, [21] [22] inevitably producing a profound impact on the development of the next generation battery. In addition, a recent review summed up six different structure models of graphene and inorganic nanoparticles composites (Figure 2), and showed the channels for Li insertion/de-insertion, as a consequence, provided an important reference for future work.…”

Section: Introductionmentioning

confidence: 99%