533 research outputs found
Energy transitions, sub-national government and regime flexibility : how has devolution in the United Kingdom affected renewable energy development?
We acknowledge the support of the Economic and Social Research Council for funding the research on which this paper was based (Grant Number RES-062-23-2526).Peer reviewedPostprin
Spontaneous symmetry breaking and Lifshitz transition in bilayer graphene
We derive the renormalization group equations describing all the short-range
interactions in bilayer graphene allowed by symmetry and the long range Coulomb
interaction. For certain range of parameters, we predict the first order phase
transition to the uniaxially deformed gapless state accompanied by the change
of the topology of the electron spectrum.Comment: 4 pages, 3 figure
Rescaling the Governance of Renewable Energy : Lessons from the UK Devolution Experience
An earlier version of this paper was presented at the symposium āScale in environmental governance: power reconfiguration, democratic legitimacy and institutional (mis-)fitā, Berlin-Brandenburg Academy of Sciences and Humanities, Berlin 7-8 March 2013. We would like to thank the symposium participants, special issue editors and three anonymous referees for their comments and advice.Peer reviewedPublisher PD
Z-dependent Barriers in Multifragmentation from Poissonian Reducibility and Thermal Scaling
We explore the natural limit of binomial reducibility in nuclear
multifragmentation by constructing excitation functions for intermediate mass
fragments (IMF) of a given element Z. The resulting multiplicity distributions
for each window of transverse energy are Poissonian. Thermal scaling is
observed in the linear Arrhenius plots made from the average multiplicity of
each element. ``Emission barriers'' are extracted from the slopes of the
Arrhenius plots and their possible origin is discussed.Comment: 15 pages including 4 .ps figures. Submitted to Phys. Rev. Letters.
Also available at http://csa5.lbl.gov/moretto
Correlations in Nuclear Arrhenius-Type Plots
Arrhenius-type plots for multifragmentation process, defined as the
transverse energy dependence of the single-fragment emission-probability,
-ln(p_{b}) vs 1/sqrt(E_{t}), have been studied by examining the relationship of
the parameters p_{b} and E_{t} to the intermediate-mass fragment multiplicity
. The linearity of these plots reflects the correlation of the fragment
multiplicity with the transverse energy. These plots may not provide thermal
scaling information about fragment production as previously suggested.Comment: 12 pages, Latex, 3 Postscript figures include
Multicomponent fractional quantum Hall effect in graphene
We report observation of the fractional quantum Hall effect (FQHE) in high
mobility multi-terminal graphene devices, fabricated on a single crystal boron
nitride substrate. We observe an unexpected hierarchy in the emergent FQHE
states that may be explained by strongly interacting composite Fermions with
full SU(4) symmetric underlying degrees of freedom. The FQHE gaps are measured
from temperature dependent transport to be up 10 times larger than in any other
semiconductor system. The remarkable strength and unusual hierarcy of the FQHE
described here provides a unique opportunity to probe correlated behavior in
the presence of expanded quantum degrees of freedom.Comment: 5 pages, 3 figure
- ā¦