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(Color online) High mobility epitaxial graphene. (a) The longitudinal resistivity and Hall resistance manifest the quantum Hall effect. Inset, an enhanced optical image of a graphene device for thermoelectric measurements. The scale bar is 2 μm. (b) The thermopower in low magnetic field displays strong and reproducible fluctuations.
(Color online) The thermopower Sxx as a function of temperature. Open black square, experiment, solid blue line is a least square fit to AT + BT 2.
(Color online) The magnetic field dependence of the thermopower Sxx (panel a) is plotted for T = 10, 20, 30, 50, 80, 100 K, from bottom to top. Data show oscillations that are periodic in inverse magnetic field. The amplitudes of the oscillations AS are multiplied by the Landau index n and plotted as a function of temperature in panel (b) for n = 2, 3, 4, 5, 6 (circle, square, star, triangle, and diamond). The dashed line marks .
(Color) The Nernst signal Syx , showing quantum oscillations, are plotted for T = 10, 20, 30, 50, 80, 100 K, denoted by black, red, blue, dark green, magenta, and dark yellow, respectively.
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