Browsing by Subject "Physics, Condensed Matter"
Now showing items 1-11 of 11
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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 ... -
Computational Study of Low-friction Quasicrystalline Coatings via Simulations of Thin Film Growth of Hydrocarbons and Rare Gases
(2008-04-25)Quasicrystalline compounds (QC) have been shown to have lower friction compared to other structures of the same constituents. The abscence of structural interlocking when two QC surfaces slide against one another yields ... -
Dynamics of Electronic Transport in Spatially-extended Systems with Negative Differential Conductivity
(2010)Negative differential conductivity (NDC) is a nonlinear property of electronic transport for high electric field strength found in materials and devices such as semiconductor superlattices, bulk GaAs and Gunn diodes. In ... -
Electron Correlations and Spin in Asymmetric GaAs Quantum Point Contacts and Signatures of Structural Transitions in Hall Effect of FeSe
(2010)The 1D Wigner crystal is a long sought after strongly correlated quantum state. Here we present electronic transport data of asymmetric quantum point contacts (QPC) tuned to the spin-incoherent regime, which provides evidence ... -
Fluctuation Effects in One-Dimensional Superconducting Nanowires
(2010)This thesis focuses on the fluctuation in the switching current $I_s$ of superconducting Al nanowires. We discovered that the maximum current which nanowires can support is limited by a single phase slip at low temperature. ... -
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 ... -
Nonequilibrium quantum transport through a dissipative resonant level
(Physical Review B - Condensed Matter and Materials Physics, 2013-06-21)The resonant-level model represents a paradigmatic quantum system which serves as a basis for many other quantum impurity models. We provide a comprehensive analysis of the nonequilibrium transport near a quantum phase transition ... -
Photoexcited Emission Efficiencies of Zinc Oxide
(2009)Optoelectronic properties of the II-VI semiconductor zinc oxide (ZnO) have been studied scientifically for almost 60 years; however, many fundamental questions remain unanswered about its two primary emission bands--the ... -
Retrapping current, self-heating, and hysteretic current-voltage characteristics in ultranarrow superconducting aluminum nanowires
(Physical Review B - Condensed Matter and Materials Physics, 2011-11-08)Hysteretic I-V (current-voltage) curves are studied in narrow Al nanowires. The nanowires have a cross section as small as 50 nm2. We focus on the retrapping current in a down-sweep of the current, at which a nanowire re-enters ... -
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 ... -
Tunable quantum phase transitions in a resonant level coupled to two dissipative baths
(Physical Review B - Condensed Matter and Materials Physics, 2014-02-18)We study tunneling through a resonant level connected to two dissipative bosonic baths: one is the resistive environment of the source and drain leads, while the second comes from coupling to potential fluctuations on a ...
