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Title: Synchrotron Probes of Emergent Electronic States of Matter in Solids

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United States

Citation Formats

J. W. Allen. Synchrotron Probes of Emergent Electronic States of Matter in Solids. United States: N. p., 2007. Web.
J. W. Allen. Synchrotron Probes of Emergent Electronic States of Matter in Solids. United States.
J. W. Allen. Wed . "Synchrotron Probes of Emergent Electronic States of Matter in Solids". United States. doi:.
title = {Synchrotron Probes of Emergent Electronic States of Matter in Solids},
author = {J. W. Allen},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 04 00:00:00 EDT 2007},
month = {Wed Apr 04 00:00:00 EDT 2007}
  • A major intellectual theme of quantum condensed matter physics concerns properties that are emergent, i.e., characteristic of the ensemble and not simply of the constituent atoms and electrons. Such properties arise from various interactions and include mass renormalization and quencing of spin in the Kondo effect; collective behaviors such as ferromagnetism, charge density waves and superconductivity; and novel quantum ground states such as the Luttinger liquid. Synchrotron-based studies of such phenomena are increasingly essential for driving quantum condensed matter research forward. This talk will describe synchrotron studies directed at electronic emergent phenomena - methods and examples, a look to themore » past, and prospects for the near future.« less
  • All the physical, chemical, and mechanical properties of materials are controlled by electrons that occupy the highest energy levels in solids, those near the Fermi energy. Many techniques were developed to study those electrons, leading to the great successes of condensed matter physics. Newer and complex materials, such as the high-temperature superconductors, tend to exhibit very large anisotropies in their physical properties, requiring a more detailed knowledge of the behavior of electrons not only as a function of their energy, but also their momentum. Angle-resolved photoemission can contribute to our understanding by providing a great deal of information on manymore » of the momentum-dependent properties of electrons and their interactions. In this talk, I will present a brief overview of how a long-term and focused collaboration between scientists at Argonne and other institutions has contributed to making angle-resolved photoemissions a most useful tool in the study of complex states of matter.« less
  • A novel approach which exploits the geometry of extra spacetime dimensions has been recently proposed as a means to resolving the hierarchy problem, i.e., the large energy gap that separates the electroweak scale and the scale where gravity becomes strong. I will describe two models of this type: one where the apparent hierarchy is generated by a large volume for the extra dimensions, and a second where the observed hierarchy is created by an exponential warp factor which arises from a non-factorizable geometry. Both scenarios have concrete and distinctive phenomenological tests at the TeV scale. I will describe the classesmore » of low-energy and collider signatures for both models, summarize the present constraints from experiment, and examine the ability of future accelerators to probe their parameter space.« less
  • Recent electrical resistivity measurements under high pressure revealed that materials with strongly correlated electrons exhibit many interesting physical properties such as a stabilization of insulating phase, generation of unconventional superconductivity, and so on. However, there seems to be no attempt by optical measurements to study directly the change in the electronic states from metallic phase to insulating one under high pressure in GPa range because of the difficulty in experiments in the far-infrared region. The difficulty is mainly caused by the insufficiency in the brightness of conventional black body sources. SPring-8 supplies a more collimated and brilliant infrared beam tomore » the end station than conventional thermal sources, and then make possible a spectromicroscopic measurement under high pressures above 10 GPa in the far-infrared region. In this paper, we report recent results of the optical study on several kinds of solids which exhibit a cross-over change in the electronic states under high pressure.« less