Quantum over breakfast Quantum over breakfast

Fall 2010

November 29

Seventh meeting

Posted on 11/22/2010

Science and Technology I, Room 306, 11am (+ lunch after noon)

QOB visitor informal talk
Dr. Adrian Del Maestro, Institute for Quantum Matter at Johns Hopkins University

Quantum Monte Carlo Studies of Luttinger Liquids
We employ worm algorithm path integral quantum Monte Carlo methods to study one dimensional, strongly interacting bosonic systems at finite temperature in the continuum. An analysis of the resulting numerical data indicates corrections to the scaling predictions of the usual harmonic Luttinger Liquid theory that can be understood by extending the field theory to include formally irrelevant operators.

November 5

Sixth meeting

Posted on 11/04/2010

Science and Technology I, Room 306, 11am (+ lunch after noon)

QOB visitor informal talk
Prof. Radha Balakrishnan, Institute of Mathematical Sciences, India

A brief introduction to solitons and integrability

October 8

Fifth meeting

Posted on 10/07/2010

Science and Technology I, Room 306, 11am (+ lunch after noon)

Mahmoud Lababidi graceously volunteered to discuss his work on the Josephson effect on a Topological Insulator Surface. Some reading material: Beenakker and Maiti, Sengupta.

October 1

Fourth meeting

Posted on 09/29/2010

Science and Technology I, Room 306, 11am (+ lunch after noon)

QOB visitor informal talk
Dr. Noah Bray-Ali, NIST

Holographic Entanglement Spectrum
Topological insulators and topological superconductors are characterized by dimensional reduction: their low energy, compressible excitations live on the boundary. This holography (dimensional reduction) extends to the quantum information content of the ground-state wavefunction. The universal part of the entanglement spectrum (singular value decomposition of the wavefunction) matches the universal part of the energy spectrum for boundary excitations. We present the holographic entanglement spectrum of two-dimensional paired fermion systems with breaking of parity and time-reversal symmetries, as a concrete example, and discuss extensions to other topological states of matter.

Biographical notes: Noah Bray-Ali is a condensed matter theorist working on quantum, many-body physics of strongly correlated electron and atom systems. He received his PhD from UC Berkeley in 2006 for work on the stability of superconductivity and antiferromagnetism to nanoscale inhomogeneity. He held a postdoctoral position at University of Southern California from 2006-2009 applying quantum information ideas to study unconventional superconductors and the Mott metal-insulator transition. From 2009-2010, he was at University of Kentucky studying the effects of inhomogeneity on quantum Hall bilayers. Since August 2010, he has joined the Joint Quantum Institute at National Institute of Standards and Technology-Gaithersburg and University of Maryland, College Park as a National Research Council postdoctoral research associate focusing on topological states of matter in ultra-cold atom systems.

September 24

Third meeting

Posted on 09/22/2010

Science and Technology I, Room 306, 11am (+ lunch after noon)

Satyan's turn... His papers indicate that he'll bring many cold atoms, so dress warmly.

September 17

Second meeting

Posted on 09/14/2010

Science and Technology I, Room 306, noon-2pm

Tanja will discuss her work on Frustrated Bose condensates in optical lattices and a follow-up paper by the group at UMD.

September 10

First meeting

Posted on 09/07/2010

Science and Technology I, Room 306, noon-2pm

Featuring: Welcome lunch for our new postdocs and students; Making plans for future; Predrag's musings about scattering resonances of fermions in lattice potentials, and Cooper pair insulators.