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Viscous Regime of Electron Transport at a Graphene Constriction

Marta Pita Vidal

出版	Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyeria de Telecomunicació de Barcelona, 2017
URL	http://books.google.com.hk/books?id=XUwPywEACAAJ&hl=&source=gbs_api

註釋

Under mesoscopic conditions, strong electron-electron interactions and weak electron-phonon coupling in graphene lead to an hydrodynamic behaviour of electron dynamics, resulting in unusual transport phenomena. During the last years, there have been several theoretical studies of macroscopic signatures of this collective cooperation of electrons. Here, we want to distinguish this hydrodynamic regime studying the conductance through a narrow geometrical constriction in graphene. To do so, we have fabricated high-quality, low-disorder graphene nano-constriction devices encapsulated by hexagonal boron nitride, where electron-electron scattering dominates impurity scattering. We carried out systematic four-probe conductance measurements on devices with different constriction widths as a function of carrier density and temperature. The observation of quantum transport phenomena that are inconsistent with the non-interacting ballistic free-fermion model suggests a macroscopic transport signature of electron viscosity.