James K. Freericks

Prof. James K. Freericks

Georgetown University
orcid

Research Focus & Metrics

Academic Career Length

39Years (1988-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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25 April 2012 in Nature
Verified
Journal Article
Closed access
JBJoseph W. Britton
Joseph W. Britton
BSBrian C. Sawyer
Brian C. Sawyer
AKAdam C. Keith
Adam C. Keith
CWC.-C. Joseph Wang
C.-C. Joseph Wang
James K. FreericksJames K. Freericks
James K. Freericks
JBJohn J. Bollinger
John J. Bollinger

1 June 2010 in Nature
Verified
Journal Article
Closed access
PDF file
KKK. Kim
K. Kim
MCM.-S. Chang
M.-S. Chang
SKS. Korenblit
S. Korenblit
RIR. Islam
R. Islam
EEE. E. Edwards
E. E. Edwards
CMC. Monroe
C. Monroe

3 May 2013 in Science
Verified
Journal Article
Closed access
PDF file
RIR. Islam
R. Islam
CSC. Senko
C. Senko
WCWes C Campbell
Wes C Campbell
SKS. Korenblit
S. Korenblit
JSJ. Smith
J. Smith
CMC. Monroe
C. Monroe
Magnetic Frustration: The study of magnetic frustration has a long history in solid-state physics, but cold-atom systems now offer the possibility of simulating the problem with exquisite control. Islam et al. (p. 583 ) study a system of 16 trapped ions, using the Coulomb interactions between the ions to simulate exchange interactions present in magnetic systems. The measured spin correlations provide a window into the behavior of the system, as the effective magnetic field and the range of the interactions are tuned.

5 July 2011 in Nature Communications
Verified
Journal Article
Open access
PDF file
RIR. Islam
R. Islam
EEE.E. Edwards
E.E. Edwards
KKK. Kim
K. Kim
SKS. Korenblit
S. Korenblit
CNC. Noh
C. Noh
CMC. Monroe
C. Monroe
A quantum simulator is a well-controlled quantum system that can follow the evolution of a prescribed model whose behaviour may be difficult to determine. A good example is the simulation of a set of interacting spins, where phase transitions between various spin orders can underlie poorly understood concepts such as spin liquids. Here we simulate the emergence of magnetism by implementing a fully connected non-uniform ferromagnetic quantum Ising model using up to 9 trapped 171Yb+ ions. By increasing the Ising coupling strengths compared with the transverse field, the crossover from paramagnetism to ferromagnetic order sharpens as the system is scaled up, prefacing the expected quantum phase transition in the thermodynamic limit. We measure scalable order parameters appropriate for large systems, such as various moments of the magnetization. As the results are theoretically tractable, this work provides a critical benchmark for the simulation of intractable arbitrary fully connected Ising models in larger systems.

1 January 1995 in Advances in Physics
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Journal Article
Closed access
TPTh. Pruschke
Th. Pruschke
MJM. Jarrell
M. Jarrell
James K. FreericksJames K. Freericks
James K. Freericks
A systematic study of optical and transport properties of the Hubbard model, based on the Metzner-Vollhardt dynamical mean-field approximation, is reviewed. This model shows interesting anomalous properties that are, in our opinion, ubiquitous to single-band strongly correlated systems (for all spatial dimensions greater than one) and also compare qualitatively with many anomalous transport features of the high-T c cuprates. This anomalous behaviour of the normal-state properties is traced to a ‘collective single-band Kondo effect’, in which a quasiparticle resonance forms at the Fermi level as the temperature is lowered, ultimately yielding a strongly renormalized Fermi liquid at zero temperature.

30 October 2003 in Reviews of Modern Physics
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Journal Article
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James K. FreericksJames K. Freericks
James K. Freericks
VZVeljko Zlatić
Veljko Zlatić
The Falicov-Kimball model was introduced in 1969 as a statistical model for metal-insulator transitions; it includes itinerant and localized electrons that mutually interact with a local Coulomb interaction and is the simplest model of electron correlations. It can be solved exactly with dynamical mean-field theory in the limit of large spatial dimensions, which provides an interesting benchmark for the physics of locally correlated systems. In this review, the authors develop the formalism for solving the Falicov-Kimball model from a path-integral perspective and provide a number of expressions for single- and two-particle properties. Many important theoretical results are examined that show the absence of Fermi-liquid features and provide a detailed description of the static and dynamic correlation functions and of transport properties. The parameter space is rich and one finds a variety of many-body features like metal-insulator transitions, classical valence fluctuating transitions, metamagnetic transitions, charge-density-wave order-disorder transitions, and phase separation. At the same time, a number of experimental systems have been discovered that show anomalies related to Falicov-Kimball physics [including YbInCu4, EuNi2(Si1−xGex)2, NiI2, and TaxN].