Abstract: The topological phases of periodically driven, or Floquet systems, rely on a perfectly periodic modulation of system parameters in time. Even the smallest deviation from periodicity leads to decoherence, causing the boundary (end) states to leak into the system’s bulk. Here, we show that in one dimension this decay of topologically protected end states depends fundamentally on the nature of the bulk states: a dispersive bulk results in an exponential decay, while a localized bulk slows the decay down to a diffusive process. The localization can be due to disorder, which remarkably counteracts decoherence even when it breaks the symmetry responsible for the topological protection. We derive this result analytically, using a novel, discrete-time Floquet-Lindblad formalism and confirm our findings with the help of numerical simulations.
Time: Thursday, February 7, 2019. 2.30 pm
Location: Lecture Room, 1st Floor, School of Theoretical Physics, DIAS, 10 Burlington Road, Dublin 4
Proud to present the winners of the SCE Johann Kaspar Zeuss-prize for the best PhD theses in Celtic Studies for 2018 and 2019: Dr Nike Stam (@Naoicea) and Dr Rebecca Shercliff, who were presented with the awards yesterday at the Celtic Congress @Cyngres2. /1 pic.twitter.com/aLQ39zGFLK
This afternoon during the 4-5:30 session @Cyngres2 , postdoc @ChantalKobel will present her work on a selection of hitherto unidentified and unnoticed glossed extracts to Bretha Nemed Toísech!
@myHNN has a new article out profiling Professor Robin Chapman Stacey, a member of the Governing Board for the School of Celtic Studies, and her work studying the sources of Medieval law in Wales! 🏴⚖️
Today, the School of Celtic Studies is headed to @BangorUni for the XVIth International Congress of Celtic Studies @Cyngres2! Did you know that the very first Congress of Celtic Studies was held here, @DIAS_Dublin, in 1959?!
As we mark #Apollo50, we also celebrate our own 50th anniversary as space research pioneers! We think there will be even more to celebrate over the next 50 as DIAS continues to push the boundaries of space research and exploration!