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Department of Physics and Astronomy
University of Mississippi

Events

Event Information:

  • Wed
    03
    Apr
    2019

    Physics Journal Club: 1) Grid Computing, 2) Fractional Quantum Hall Effect

    12:00 pmLewis Hall 104

    Anil Panta
    Department of Physics and Astronomy
    University of Mississippi

    Grid Computing at Belle II

    The Belle II detector at the SuperKEKB accelerator, an asymmetric e+e- collider in Tsukuba, Japan, are major upgrades of the Belle detector and KEKB accelerator. The goal for the SuperKEKB accelerator is to reach an instantaneous luminosity of 8 × 1035 cm−2 s−1 , about 40 times the world-record peak luminosity of KEKB. At its peak, the Belle II detector will see a data rate of about 1.8 GB/s. The ultimate goal of the experiment is to collect a data sample of 50/ab, which corresponds to a data size on the order of a few hundred PB. In order to cope with the ever increasing data sample, Belle II has adopted grid based computing, as opposed to centralized computing at KEK alone for Belle. I will introduce the grid structure with its functionality and the software framework for distributed computing at Belle II.

     

    Huu Do
    Department of Physics and Astronomy
    University of Mississippi

    Fractional Quantum Hall Effect: is that Electron’s Quark?

    This talk, I present a counter-intuitive and bizarre phenomenon: fractional quantum Hall effect. This effect is resulted in the  correlation between electrons in the two dimensional (2D) system creating a new quasiparticle with its charge smaller than electron one. First, I will describe the long history of classical Hall effect - integer quantum Hall effect - fractional quantum Hall effect in the  phenomenological point of view. I will briefly show the conditions for and how they could measure quantum Hall effects that are recognized as two Nobel prizes by Klaus von Klitzing (1985), and Robert B. Laughlin, Horst L. Stommer, and Daniel C. Tsui (1998). Second, one of the most interesting idea for me is the distinguish properties of quantum 2D electron system (“featureless liquid”) from classical one (“charged electron gas”). Lastly, I will introduce about the concept of composite particles that include electrons and quantum flux particles (generated by the magnetic field in two-dimensional electron system), and the intrinsic transition between fermion-boson-fermion occured in the fractional quantum Hall effect. The contents of my presentation is summarized in the publication at the Review Modern Physics journal: “Nobel Lecture: the fractional quantum Hall effect” by Horst L. Stormer.