Browsing by Author "Ke, CT"
Now showing items 1-10 of 10
-
Ballistic Graphene Josephson Junctions from the Short to the Long Junction Regimes.
(Physical review letters, 2016-12-02)We investigate the critical current I_{C} of ballistic Josephson junctions made of encapsulated graphene-boron-nitride heterostructures. We observe a crossover from the short to the long junction regimes as the length of ... -
Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor
(Physical Review B, 2019-09-10)© 2019 American Physical Society. We study a two-terminal graphene Josephson junction with contacts shaped to form a narrow constriction, less than 100nm in length. The contacts are made from type-II superconducting contacts ... -
Doping-driven structural phase transition and loss of superconductivity in MxFe1-xSe delta (M=Mn, Cu)
(2010)In this paper, we report the results of detailed studies on Mn and Cu substitution to Fe site of beta-FeSe, namely, MnxFe(1-x)Se(1-delta) and CuxFe1-xSe1-delta (delta equals to 0.03-0.05 based on our neutron-diffraction ... -
Investigation of Supercurrent in the Quantum Hall Regime in Graphene Josephson Junctions
(Journal of Low Temperature Physics, 2018-06-01)© 2018, Springer Science+Business Media, LLC, part of Springer Nature. In this study, we examine multiple encapsulated graphene Josephson junctions to determine which mechanisms may be responsible for the supercurrent observed ... -
Nonstoichiometry of LixCu2O2+delta single crystal and its relation to magnetic ordering
(2010)We report the first systematic study on the nonstoichiometry of Li/Cu ionic ratios x and oxygen defect concentrations delta in LixCu2O2+delta solid solution. Nonstoichiometric crystals with intentional Li-deficient (x=0.97) ... -
Subkelvin lateral thermal transport in diffusive graphene
(Physical Review B, 2019-03-29)© 2019 American Physical Society. In this work, we report on hot carrier diffusion in graphene across large enough length scales that the carriers are not thermalized across the crystal. The carriers are injected into graphene ... -
Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime
(MRS Advances, 2018-01-01)© 2018 Materials Research Society. Coupling superconductors to quantum Hall edge states is the subject of intense investigation as part of the ongoing search for non-abelian excitations. Our group has previously observed ... -
Supercurrent in the quantum Hall regime.
(Science (New York, N.Y.), 2016-05)A promising route for creating topological states and excitations is to combine superconductivity and the quantum Hall (QH) effect. Despite this potential, signatures of superconductivity in the QH regime remain scarce, ... -
Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point
(arXiv, 2016-09)The nonlinear I-V curve at an interacting quantum critical point (QCP) is typically out of reach theoretically. Here, however, we provide an analytical calculation of the I-V curve at a QCP under nonequilibrium conditions ...
