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DTSTART:20180325T030000
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DTSTAMP:20260424T143415Z
UID:5a5f5ddd5f8f6741313037@ist.ac.at
DTSTART:20180216T110000
DTEND:20180216T123000
DESCRIPTION:Speaker: Timothy Duty\nhosted by Johannes Fink\nAbstract: Quant
 um physics in one spatial dimension is peculiar and remarkably rich\, yet 
 even with strong interactions and disorder\, surprisingly tractable. This 
 is due to the fact that the low-energy physics of nearly all 1D systems ca
 n be cast in terms of the Luttinger liquid\, a key concept that parallels 
 that of the Fermi liquid in higher dimensions.  Although there have been m
 any theoretical proposals to use linear chains and ladders of Josephson ju
 nctions to create novel quantum phases and innovative electronic devices\,
  only modest progress has been made experimentally. One major roadblock ha
 s been a lack of understanding the role of disorder in such systems. We pr
 esent recent experimental results that strongly confirm TLL behaviour in o
 ur devices\, validate the quantum many-body theory of one-dimensional diso
 rdered systems\, and shed light on the competition between Mott insulator 
 and Bose glass. The Bose glass phase is thought to describe helium-4 in po
 rous media\, cold atoms in disordered optical potentials\, disordered magn
 etic insulators\, and thin superconducting films. The ubiquity of such an 
 electronic glass in Josephson-junction chains has important implications f
 or their proposed use as a fundamental current standard\, which is based o
 n synchronisation of coherent tunnelling of flux quanta (quantum phase sli
 ps).  Recent extensions of this work to SQUID chains and ladders will also
  be presented.
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:sdanzing@ist.ac.at
SUMMARY:Timothy Duty: Quantum physics in one dimension using Josephson junc
 tion arrays
URL:https://talks-calendar.ista.ac.at/events/1051
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