[colloquium] Admin : 24th Mar 2009 : "Physics in low dimensions..."

[Broadcast-IISc <broadcast@iisc.ernet.in>]

Dear All,

                    INDIAN INSTITUTE OF SCIENCE
                              BANGALORE

                        INSTITUTE COLLOQUIUM
                 (Physical & Mathematical Sciences)


                         Prof. Diptiman Sen
                   Centre for High Energy Physics


                        will deliver a lecture
                                 on

                 Physics in low dimensions: quantum
                 wires, spin chains and fractional
                           quantum numbers

                        Tuesday, March 24, 2009
                     at 4.30 pm in the Faculty Hall


                             THE DIRECTOR
                             will preside

                       All are cordially invited

Coffee/Tea:5.30 pm                              Venue: Reception Hall
                                                                                                        -------------
                               Abstract
                             ------------

Systems of interacting electrons or spins in one and two dimensions can
exhibit a number of unusual features at low temperatures. We will discuss
three examples from our work.

	(i)  The conductances of quantum wires with impurities or
             junctions vary as a power of the temperature because
             of interactions between the electrons.

	(ii) A chain of quantum spins has quite different properties
             depending on the values of the spin angular momentum at
              each site and other parameters of the system.

	(iii) In quantum Hall systems, the low-energy excitations can
              have charges and statistics which are simple fractions
              of the charge and statistics of an electron.  We propose
              a way of measuring these quantities experimentally.

      All the necessary concepts of quantum mechanics will be
      introduced   during the talk.

                                         -----


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