Upcoming Events

Duke Physics Colloquium
Thomas Barthel (Univ of Paris-Sud and CNRS)
Physics 128
Date: Monday, April 21, 2014 - 3:00pm

** Please note this event is on MONDAY not Wednesday. ** The non-locality of quantum many-body systems, and hence their information content, can be quantified by entanglement measures. For ground states of condensed matter systems, I will discuss how the entanglement scales with the subsystem size, and how it behaves under time-evolution after a sudden change of system parameters (quench). The available number of degrees of freedom in a quantum many-body system grows exponentially with the system size.

Condensed Matter Seminar
Thomas Barthel (Univ. Paris Sud, Orsay, France)
Physics 298
Date: Tuesday, April 22, 2014 - 9:15am

Ultimately, every quantum system of interest is coupled to some form of environment which leads to decoherence. Until our recent study, it was assumed that, as long as the environment is memory-less (i.e. Markovian), the temporal coherence decay is always exponential-- to such a degree that this behavior was synonymously associated with decoherence. However, the situation can change if the system itself is a many-body system. In this case, the interplay between dissipation and internal interactions gives rise to a wealth of novel phenomena.

David Weitz (Harvard University)
Physics 119
Date: Tuesday, April 22, 2014 - 2:50pm

The stiffness of cells is commonly assumed to depend on the stiffness of their surrounding: bone cells are much stiffer than neurons, and each exists in surrounding tissue that matches the cell stiffness. In this talk, I will discuss new measurements of cell stiffness, and show that that cell stiffness is strongly correlated to cell volume. This affects both the mechanics and the gene expression in the cell, and even impacts on the differentiation of stem cells.

David Weitz (Harvard)
Physics 128
Date: Wednesday, April 23, 2014 - 3:30pm

"Dripping, Jetting, Drops and Wetting: The Magic of Microfluidics"

Condensed Matter Seminar
Francois Amet (Stanford University)
Physics 298
Date: Thursday, April 24, 2014 - 11:30am

The electronic properties of graphene are well described by a non-interacting Dirac Hamiltonian with a fourfold symmetry associated with spin and valley, an additional degree of freedom due to the hexagonal crystal lattice of graphene. As a result, graphene exhibits a variety of peculiar phenomena such as an anomalous quantum Hall effect. At high magnetic fields, the electron kinetic energy is quenched by the Landau quantization, and Coulomb interactions become the dominant energy scale of the system.

Triangle Nuclear Theory Colloquium
Alain Coc (Paris)
Raleigh N.C.
Date: Thursday, May 1, 2014 - 3:30pm

Primordial nucleosynthesis (or BBN) is one of the three observational evidences for the Big¿Bang model. It is very special as it involves only a dozen main nuclear reactions and because, contrary to stellar models, within the standard BBN model, the thermodynamic con- ditions can be calculated from first principles, that can be tested in that way.

Triangle Nuclear Theory Colloquium
Jacques Soffer (Temple U.)
Physics 298
Date: Tuesday, May 6, 2014 - 3:30pm

We will first recall why the nucleon spin sructure is such a difficult and subtle
problem, not yet fully understood in QCD. We will then describe the quantum statistical approach to parton distributions and some recent results, in particular related to the nucleon spin structure. Future measurements are challenging to check the validity of this novel framework.

Duke Teaching Observatory
Duke Teaching Observatory
Date: Friday, May 9, 2014 - 9:00pm

Observe the sky through modern 10" telescopes, guided
by Duke physicists. Everyone welcome. Weather dependent