A Metal That Behaves Like Water
Researchers describe new behaviors of graphene
Science Daily | February 11, 2016
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| Scientists at Harvard and Raytheon BBN Technology have made a breakthrough in our understanding of graphene’s basic properties, observing for the first time electrons in a metal behaving like a fluid. Source: http://www.gizmag.com/liquid-graphene-dirac-fluid/41801/ |
<more at https://www.sciencedaily.com/releases/2016/02/160211185926.htm; related links: https://www.seas.harvard.edu/news/2016/02/metal-that-behaves-like-water (+Video) (A metal that behaves like water. February 11, 2016) and http://science.sciencemag.org/content/early/2016/02/10/science.aad0343 (Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene. Jesse Crossno1, Jing K. Shi, Ke Wang, Xiaomeng Liu, Achim Harzheim, Andrew Lucas, Subir Sachdev, Philip Kim, Takashi Taniguchi, Kenji Watanabe, Thomas A. Ohki, and Kin Chung Fong. Science 11 Feb 2016. DOI: 10.1126/science.aad0343. [Abstract: Interactions between particles in quantum many-body systems can lead to collective behavior described by hydrodynamics. One such system is the electron-hole plasma in graphene near the charge neutrality point, which can form a strongly coupled Dirac fluid. This charge neutral plasma of quasi-relativistic fermions is expected to exhibit a substantial enhancement of the thermal conductivity, thanks to decoupling of charge and heat currents within hydrodynamics. Employing high sensitivity Johnson noise thermometry, we report an order of magnitude increase in the thermal conductivity and the breakdown of the Wiedemann-Franz law in the thermally populated charge neutral plasma in graphene. This result is a signature of the Dirac fluid, and constitutes direct evidence of collective motion in a quantum electronic fluid.])>
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