Vortrag
"Fractional and Integer Quantum Conductance at 300K and Zero Magnetic Field in Polymer-Suspended Graphene Nanoplatelets"
Mittwoch 22.06.2016, 09:15 - 11:00
TUM, Lehrstuhl für Technische Elektrophysik, Theresienstr 90, Geb. N4, 1. Stock, N1414
Quantized conductance is observed at zero magnetic field and room
temperature in metal-insulator-metal structures with graphene submicron-sized nanoplatelets embedded in a 3-hexylthiophene (P3HT) polymer
layer. In devices with medium concentration of graphene platelets, integer
multiples of G0 = 2e2/h = 12.91 (kΩ)−1, and in some devices partially quantized including a
series of with (n/7) × G0, steps are observed. Such an organic
memory device exhibits reliable memory operation with an on/off ratio of more
than 10. We attribute the quantized conductance to the existence of a 1-D
electron waveguide along the conductive path. The partial quantized conductance
results likely from imperfect transmission coefficient due to impedance
mismatch of the first waveguide modes.
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