Materials science

The Tomonaga-Luttinger Liquid
This Materials Science Weekly Postdoctoral Seminar will be held in the new Energy Sciences Building, ESB 241, Conference Room A323.

The Tomonaga-Luttinger (TL) liquid is a model of interacting fermions in one dimension. This model predicts a variety of phenomena which represent spectacular departures from Fermi liquid theory. In this seminar, I will present a gentle introduction to the physics of the TL liquid as well as a survey of the systems in which TL phenomena have been observed.

Intermediate State: Do We Really Know It Well?
Rich physics of the intermediate state (IS) in type-I superconductors have been recognized already at the first consideration of superconductivity as a new thermodynamic state of matter (Gorter and Casimir, 1934). Classic works on the IS include the works by F. London (1936), Peierls (1936), Landau (1937), and Ginzburg and Landau (1950).
Scientists gain new insight into mysterious electronic phenomenonApril 11, 2014

Thanks to a new Argonne study, researchers have identified and solved at least one paradox in the behavior of high-temperature superconductors. The riddle involves a phenomenon called the “pseudogap,” a region of energy levels in which relatively few electrons are allowed to exist.

Designing Materials at the Nanoscale: Semiconductor and Graphene Quantum Dots
We review here recent theoretical and experimental results on designing materials at the nanoscale - semiconductor and graphene quantum dots. We briefly describe lateral quantum dot molecules as building blocks of quantum circuits based on electron spin: artificial Haldane gap device, GHZ maximally entangled state, Berry’s phase and e-e driven topological phases generators[1,2].
Many Body Localization: A Macroscopic Quantum Phenomena in Highly Excited States
In 1958 P. W. Anderson showed that eigenstates of a single-particle quantum Hamiltonian in the presence of disorder can be localized in space. In the same paper he had speculated on the possibility of lack of thermalization in an isolated quantum system even in the presence of interactions.
Majorana Fermions in Vortex Lattices
Majorana fermion bound states are at the front and center of approaches to realizing topological quantum computation. In this talk, I will first introduce the peculiar quantum characteristics of Majorana bound states. Then, I will argue that the amplitude for Majorana fermions to tunnel between a pair of vortices necessarily depends on the background superconducting phase profile; it is proportional to the sine of half the difference between the phases at the two vortices.