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Chapter and Conference Paper
Electron Solid Formation at a Modulation Doped Heterojunction in a High Magnetic Field
By means of a radiofrequency spectroscopy experiment which tests for shear rigidity by detecting a gapless magneto-phonon excitation branch, we are able to affirm that electrons at a high quality modulation do...
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Article
Observation of tunneling and magneto-tunneling out of a 2D Wigner crystal
We measured the escape rates of surface state electrons from an electron layer confined at the liquid helium-vacuum interface in the temperature range of 30–450mK, and for densities 0.02–2.2×108 cm −2. Below 200m...
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Chapter
Experiments on Two-Dimensional Wigner Crystals
In 1934 Wigner predicted(1) that the conduction electrons in a metal would undergo a transition from a liquid state to form a crystal when their density was sufficiently reduced. The crystal melts at a critical d...
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Article
Evidence for a glassy phase in the vortex state of 2H−NbSe2
We have measured the DC response and RF surface impedance of 2H−NbSe 2 single crystals in fields up to 2 Tesla. The results suggest that there are two distinct states of the vortex lattice; one is...
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Article
Dynamic instabilities and memory effects in vortex matter
The magnetic flux line lattice in type II superconductors serves as a useful system in which to study condensed matter flow, as its dynamic properties are tunable. Recent studies have shown a number of puzzlin...
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Article
Observation of Van Hove singularities in twisted graphene layers
When a Van Hove singularity exists near the Fermi energy of a solid’s density of states, it can cause a variety of exotic phenomena to emerge. Scanning tunnelling microscope measurements indicate that when gra...
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Article
Open AccessObserving a scale anomaly and a universal quantum phase transition in graphene
One of the most interesting predictions resulting from quantum physics, is the violation of classical symmetries, collectively referred to as anomalies. A remarkable class of anomalies occurs when the continuo...