David Ceperley

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We experimentally probe the properties of the disordered Bose-Hubbard model using an atomic Bose-Einstein condensate trapped in a 3D disordered optical lattice. Controllable disorder is introduced using a fine-grained optical speckle field with features comparable in size to the lattice spacing along every lattice direction. A precision measurement of the(More)
2.3 CAD model and photograph of external cavity diode laser design. A ther-moelectric element between the enclosure and the plate to which the ECDL components are mounted is used to adjust the temperature of the plate.. v 2.26 Evaporation sequence for producing nearly pure BEC in the hybrid opti-3.1 Sample of sequencer code, generated C code, and(More)
We determine the critical temperature of a 3D homogeneous system of hard-sphere bosons by pathintegral Monte Carlo simulations and finite-size scaling. In the low density limit, we find that the critical temperature is increased by the repulsive interactions, as DTCyT0 , sna3dg , where g ­ 0.34 6 0.03. At high densities the result for liquid helium, namely,(More)
Electronic Properties and Mid-Infrared Transitions in Self-Assembled Quantum Dots Jean-Pierre LEBURTON1,2, Leornado R. C. FONSECA2, John SHUMWAY2,3, David CEPERLEY2,3 and Richard M. MARTIN2,3 1Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA 2Beckman Institute of Advanced Science &(More)
David McKay,1 Ushnish Ray,2 Stefan Natu,3 Philip Russ,2 David Ceperley,2 and Brian DeMarco2 1James Franck Institute, University of Chicago, 929 E. 57th St., Chicago, Illinois 60637, USA 2Department of Physics, University of Illinois, 1110 W. Green St., Urbana, Illinois 61801, USA 3Joint Quantum Institute, University of Maryland, College Park, Maryland(More)
This thesis presents novel concepts for electromagnetic field simulations via partial differential equation (PDE) solvers. A vital aspect for any successful general implementation of a PDE solver is the use of an efficient absorbing boundary condition (ABC). The perfectly matched layer (PML) is a recently introduced ABC in Cartesian coordinates which(More)
For f i f t y y e a r s t h e phases o f t h e e l e c t r o n energy dominates t h e k i n e t i c ene rgy , so t h a t t h e g a s ( a l s o known a s j e l l i u m o r t h e Fermion one e l e c t r o n s must c r y s t a l l i z e . S ince these e a r l y component plasma) have been t h e o b j e c t o f c a l c u l a t i o n s , t h e r e have been(More)