72 research outputs found
Non-equilibrium breakdown of quantum Hall state in graphene
In this report we experimentally probe the non-equilibrium breakdown of the
quantum Hall state in monolayer graphene by injecting a high current density
(1A/m). The measured critical currents for dissipationless transport in
the vicinity of integer filling factors show a dependence on filling factor.
The breakdown can be understood in terms of inter Landau level (LL) scattering
resulting from mixing of wavefunctions of different LLs. To further study the
effect of transverse electric field, we measured the transverse resistance
between the to plateau transition for different bias currents
and observed an invariant point.Comment: to appear in PRB Rapi
Fabrication of Asymmetric Electrode Pairs with Nanometer Separation Made of Two Distinct Metals
We report a simple and reproducible method to fabricate two metallic
electrodes made of different metals with a nanometer-sized gap. These
electrodes are fabricated by defining a pair of gold electrodes
lithographically and electrodepositing a second metal onto one of them. The
method enables the fabrication of pairs of metallic electrodes that exhibit
distinct magnetic properties or work functions. The utility of this technique
is demonstrated by making single-electron tunneling devices incorporating 2-nm
gold nanocrystals.Comment: 3 figures, 1 colo
Magnetic Switching of Phase-Slip Dissipation in NbSe2 Nanobelts
The stability of the superconducting dissipationless and resistive states in
single-crystalline NbSe2 nanobelts is characterized by transport measurements
in an external magnetic field (H). Current-driven electrical measurements show
voltage steps, indicating the nucleation of phase-slip structures. Well below
the critical temperature, the position of the voltage steps exhibits a sharp,
periodic dependence as a function of H. This phenomenon is discussed in the
context of two possible mechanisms: the interference of the order parameter and
the periodic rearrangement of the vortex lattice within the nanobelt.Comment: 4 figure
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