Enhanced Photoenergy Harvesting and Extreme Thomson Effect in Hydrodynamic Electronic Systems

Breaking Down the Magnonic Wiedemann-Franz Law in the Hydrodynamic Regime

Recent experiments have shown an indication of a hydrodynamic magnon behavior in ultrapure ferromagnetic insulators; however, its direct observation is still lacking. Here, we derive a set of coupled hydrodynamic equations and study the thermal and spin conductivities for such a magnon fluid. We reveal the drastic breakdown of the magnonic Wiedemann-Franz law as a hallmark of the hydrodynamics regime, which will become key evidence for the experimental realization of an emergent hydrodynamic magnon behavior. Therefore, our results pave the way toward the direct observation of magnon fluids.

Unbiased Plasmonic-Assisted Integrated Graphene Photodetectors

Photonic integrated circuits (PICs) for next-generation optical communication interconnects and all-optical signal processing require efficient (∼A/W) and fast (≥25 Gbs-1) light detection at low ( Collapse

Key Words

• graphene
• photodetectors
• integrated photonics
• plasmonics
• photothermoelectric effect

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Grants

• Horizon 2020 Framework Programme
• Quantum Flagship
• Engineering and Physical Sciences Research Council
• H2020 European Research Council

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Affiliation(s)

Ioannis Vangelidis Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece
Dimitris V. Bellas Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece Department of Informatics, Center for Interdisciplinary Research and Innovation, Aristotle University of Thessaloniki, Thessaloniki 57001, Greece
Stephan Suckow AMO GmbH, Advanced Microelectronic Center Aachen (AMICA), Otto-Blumenthal-Strasse 25, Aachen 52074, Germany
George Dabos Department of Informatics, Center for Interdisciplinary Research and Innovation, Aristotle University of Thessaloniki, Thessaloniki 57001, Greece
Sebastián Castilla ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona 08860, Spain
Frank H. L. Koppens ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona 08860, Spain ICREA - Institució Catalana de Recerca i Estudis Avançats, Barcelona 08010, Spain
Andrea C. Ferrari Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA, U.K.
Nikos Pleros Department of Informatics, Center for Interdisciplinary Research and Innovation, Aristotle University of Thessaloniki, Thessaloniki 57001, Greece
Elefterios Lidorikis Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece University Research Center of Ioannina (URCI), Institute of Materials Science and Computing, Ioannina 45110, Greece

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Hot carriers in graphene - fundamentals and applications

Hot charge carriers in graphene exhibit fascinating physical phenomena, whose understanding has improved greatly over the past decade. They have distinctly different physical properties compared to, for example, hot carriers in conventional metals. This is predominantly the result of graphene's linear energy-momentum dispersion, its phonon properties, its all-interface character, and the tunability of its carrier density down to very small values, and from electron- to hole-doping. Since a few years, we have witnessed an increasing interest in technological applications enabled by hot carriers in graphene. Of particular interest are optical and optoelectronic applications, where hot carriers are used to detect (photodetection), convert (nonlinear photonics), or emit (luminescence) light. Graphene-enabled systems in these application areas could find widespread use and have a disruptive impact, for example in the field of data communication, high-frequency electronics, and industrial quality control. The aim of this review is to provide an overview of the most relevant physics and working principles that are relevant for applications exploiting hot carriers in graphene.