#### Filter Results:

#### Publication Year

2002

2016

#### Publication Type

#### Co-author

#### Key Phrase

#### Publication Venue

Learn More

The Falicov-Kimball model is a simple quantum lattice model that describes light and heavy electrons interacting with an on-site repulsion; alternatively, it is a model of itinerant electrons and fixed nuclei. It can be seen as a simplification of the Hubbard model; by neglecting the kinetic (hopping) energy of the spin up particles, one gets the… (More)

Can phase separation be induced by strong electron correlations? We present a theorem that affirmatively answers this question in the Falicov-Kimball model away from half filling, for any dimension. In the ground state the itinerant electrons are spatially separated from the classical particles.

- Joseph W Britton, Brian C Sawyer, Adam C Keith, C-C Joseph Wang, James K Freericks, Hermann Uys +2 others
- Nature
- 2012

The presence of long-range quantum spin correlations underlies a variety of physical phenomena in condensed-matter systems, potentially including high-temperature superconductivity. However, many properties of exotic, strongly correlated spin systems, such as spin liquids, have proved difficult to study, in part because calculations involving N-body… (More)

- Michael Sentef, Alexander F Kemper, Brian Moritz, James K Freericks, Zhi-Xun Shen, Thomas P Devereaux
- 2013

Nonequilibrium pump-probe time-domain spectroscopies can become an important tool to disentangle degrees of freedom whose coupling leads to broad structures in the frequency domain. Here, using the time-resolved solution of a model photoexcited electron-phonon system, we show that the relaxational dynamics are directly governed by the equilibrium… (More)

- Brian C Sawyer, Joseph W Britton, Adam C Keith, C-C Joseph Wang, James K Freericks, Hermann Uys +2 others
- Physical review letters
- 2012

We demonstrate spectroscopy and thermometry of individual motional modes in a mesoscopic 2D ion array using entanglement-induced decoherence as a method of transduction. Our system is a ~400 μm-diameter planar crystal of several hundred 9Be(+) ions exhibiting complex drumhead modes in the confining potential of a Penning trap. Exploiting precise control… (More)

- Bryce Yoshimura, Marybeth Stork, Danilo Dadic, Wesley C Campbell, James K Freericks
- 2015

We develop the theory to describe the equilibrium ion positions and phonon modes for a trapped ion quantum simulator in an oblate Paul trap that creates two-dimensional Coulomb crystals in a triangular lattice. By coupling the internal states of the ions to laser beams propagating along the symmetry axis, we study the effective Ising spin-spin interactions… (More)

We compare the decay rates of excited populations directly calculated within a Keldysh formalism to the equation of motion of the population itself for a Hubbard-Holstein model in two dimensions. While it is true that these two approaches must give the same answer, it is common to make a number of simplifying assumptions, within the differential equation… (More)

- Veljko Zlati´c, James K Freericks
- 2015

We present a theory for the charge and heat transport in a multilayer made of three sets of planes with strongly correlated electrons. The Mott insulator planes make the left and right barrier; a few delta-doped planes which are close to the metal-insulator transition make a conduction channel. In such a device, the currents can only flow parallel to the… (More)

- ‹
- 1
- ›