Now showing items 1-16 of 16

• #### 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 ...
• #### Correlation between Voronoi volumes in disc packings ﻿

(EPL (Europhysics Letters), 2012-02-01)
We measure the two-point correlation of free Voronoi volumes in binary disc packings, where the packing fraction $\phi_{\rm avg}$ ranges from 0.8175 to 0.8380. We observe short-ranged correlations over the whole range of ...
• #### Front-Mediated Melting of Isotropic Ultrastable Glasses. ﻿

(Physical review letters, 2019-10)
Ultrastable vapor-deposited glasses display uncommon material properties. Most remarkably, upon heating they are believed to melt via a liquid front that originates at the free surface and propagates over a mesoscopic crossover ...
• #### Influence of humidity on tribo-electric charging and segregation in shaken granular media. ﻿

(Soft matter, 2017-01)
We study the effect of humidity on the charge accumulation of polymer granulates shaken vertically in a stainless steel container. This setup allows us to control the humidity level from 5% to 100%RH while performing automated ...
• #### Measuring the configurational temperature of a binary disc packing. ﻿

(Soft matter, 2014-06)
Jammed packings of granular materials differ from systems normally described by statistical mechanics in that they are athermal. In recent years a statistical mechanics of static granular media has emerged where the thermodynamic ...
• #### Nucleation in Sheared Granular Matter. ﻿

(Physical review letters, 2018-02)
We present an experiment on crystallization of packings of macroscopic granular spheres. This system is often considered to be a model for thermally driven atomic or colloidal systems. Cyclically shearing a packing of frictional ...
• #### 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 ...
• #### 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 ...
• #### Robust 2-Qubit Gates in a Linear Ion Crystal Using a Frequency-Modulated Driving Force. ﻿

(Physical review letters, 2018-01)
In an ion trap quantum computer, collective motional modes are used to entangle two or more qubits in order to execute multiqubit logical gates. Any residual entanglement between the internal and motional states of the ions ...
• #### Selective breakdown of phonon quasiparticles across superionic transition in CuCrSe <inf>2</inf> ﻿

(Nature Physics, 2019-01-01)
© 2018, The Author(s), under exclusive licence to Springer Nature Limited. Superionic crystals exhibit ionic mobilities comparable to liquids while maintaining a periodic crystalline lattice. The atomic dynamics leading ...
• #### Self-Assembling DNA templates for programmed artificial biomineralization ﻿

(Soft Matter, 2011-05-16)
Complex materials with micron-scale dimensions and nanometre-scale feature resolution created via engineered DNA self-assembly represent an important new class of soft matter. These assemblies are increasingly being exploited ...
• #### Stabilizer Slicing: Coherent Error Cancellations in Low-Density Parity-Check Stabilizer Codes. ﻿

(Physical review letters, 2018-12)
Coherent errors are a dominant noise process in many quantum computing architectures. Unlike stochastic errors, these errors can combine constructively and grow into highly detrimental overrotations. To combat this, we introduce ...
• #### Superconductivity: When Andreev meets Hall ﻿

(Nature Physics, 2017-07-01)
• #### Switching currents limited by single phase slips in one-dimensional superconducting Al nanowires. ﻿

(Physical review letters, 2011-09-21)
An aluminum nanowire switches from superconducting to normal as the current is increased in an upsweep. The switching current (I(s)) averaged over upsweeps approximately follows the depairing critical current (I(c)) but ...
• #### Valleytronics: Could use a break ﻿

(Nature Physics, 2015-12-01)