Browsing by Author "Finkelstein, G"
Now showing items 1-20 of 24
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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 ... -
Connecting the nanodots: programmable nanofabrication of fused metal shapes on DNA templates.
(Nano letters, 2011-08)We present a novel method for producing complex metallic nanostructures of programmable design. DNA origami templates, modified to have DNA binding sites with a uniquely coded sequence, were adsorbed onto silicon dioxide ... -
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 ... -
Observation of majorana quantum critical behaviour in a resonant level coupled to a dissipative environment
(Nature Physics, 2013-01-01)A quantum phase transition is an abrupt change between two distinct ground states of a many-body system, driven by an external parameter. In the vicinity of the quantum critical point (QCP) where the transition occurs, a ... -
Observation of Majorana quantum critical behaviour in a resonant level coupled to a dissipative environment
(Nature Physics, 2013)A quantum phase transition is an abrupt change between two distinct ground states of a many-body system, driven by an external parameter. In the vicinity of the quantum critical point (QCP) where the transition occurs, a ... -
One-dimensional edge contact to encapsulated MoS<inf>2</inf> with a superconductor
(AIP Advances, 2021-04-01)Establishing ohmic contact to van der Waals semiconductors such as MoS2 is crucial to unlocking their full potential in next-generation electronic devices. Encapsulation of few layer MoS2 with hBN preserves the material’s ... -
Pb-Graphene-Pb josephson junctions: Characterization in magnetic field
(IEEE Transactions on Applied Superconductivity, 2012-06-14)We fabricate superconductor-graphene-superconductor Josephson junctions with superconducting regions made of lead (Pb). The critical current through graphene may be modulated by the external magnetic field; the resulting ... -
Phase diffusion in graphene-based Josephson junctions.
(Physical review letters, 2011-09-21)We report on graphene-based Josephson junctions with contacts made from lead. The high transition temperature of this superconductor allows us to observe the supercurrent branch at temperatures up to ∼2 K, at which point ... -
Phonon bottleneck in graphene-based Josephson junctions at millikelvin temperatures.
(Physical review letters, 2013-07-09)We examine the nature of the transitions between the normal and superconducting branches in superconductor-graphene-superconductor Josephson junctions. We attribute the hysteresis between the switching (superconducting to ... -
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 ... -
Superconductivity: When Andreev meets Hall
(Nature Physics, 2017-07-01) -
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, ... -
Surface-enhanced Raman scattering plasmonic enhancement using DNA origami-based complex metallic nanostructures.
(Nano letters, 2014-01)DNA origami is a novel self-assembly technique allowing one to form various two-dimensional shapes and position matter with nanometer accuracy. We use DNA origami templates to engineer surface-enhanced Raman scattering ... -
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 ... -
Two-stage Kondo effect and Kondo-box level spectroscopy in a carbon nanotube
(Physical Review B - Condensed Matter and Materials Physics, 2010-10-18)The concept of the "Kondo box" describes a single spin, antiferromagnetically coupled to a quantum dot with a finite level spacing. Here, a Kondo box is formed in a carbon nanotube interacting with a localized electron. ...
