Title: Dissipative Phase Transition in the Quantum Rabi Model with a Structured Environment
Speaker: Mark Mitchison (Trinity College Dublin)
Abstract: I will introduce the super-radiantquantum phase transition in the Rabi model and its dissipative generalisation [1,2]. I will then extend the model to include both a structured bath (i.e. frequency-dependent noise) and pure white noise. The frequency dependence of the noise is found to strongly modify the critical exponents and the dynamics of the system close to criticality. Remarkably, in the sub-Ohmic regime an unconventional second-order phase transition arises, in which the soft-mode frequency and decay rate remain finite across the critical point. This strongly suppresses the critical exponent describing the behaviour of fluctuations close to the transition. I will describe how these unusual effects compete with standard features of second-order quantum criticality induced by white noise and/or finite temperature.
Time: Thursday, 12 September 2019, 2:30pm
Location: Lecture Room, 1st Floor, School of Theoretical Physics, DIAS,
10 Burlington Road, Dublin 4
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Posted: 9th September 2019 by George Rogers
Thursday 12th September : Dissipative Phase Transition in the Quantum Rabi Model with a Structured Environment
Title: Dissipative Phase Transition in the Quantum Rabi Model with a Structured Environment
Speaker: Mark Mitchison (Trinity College Dublin)
Abstract: I will introduce the super-radiantquantum phase transition in the Rabi model and its dissipative generalisation [1,2]. I will then extend the model to include both a structured bath (i.e. frequency-dependent noise) and pure white noise. The frequency dependence of the noise is found to strongly modify the critical exponents and the dynamics of the system close to criticality. Remarkably, in the sub-Ohmic regime an unconventional second-order phase transition arises, in which the soft-mode frequency and decay rate remain finite across the critical point. This strongly suppresses the critical exponent describing the behaviour of fluctuations close to the transition. I will describe how these unusual effects compete with standard features of second-order quantum criticality induced by white noise and/or finite temperature.
Time: Thursday, 12 September 2019, 2:30pm
Location: Lecture Room, 1st Floor, School of Theoretical Physics, DIAS,
10 Burlington Road, Dublin 4
Category: Regular seminars, School of Theoretical Physics News & Events
Big thank you to @MartinaPQuinn of @helloalicepr for moderating the discussion, and of course to our panel @NeasaMcG @CormacORafferty and @laoneill111
@CormacORafferty "to cut yourself off from fundamental research means you could miss out on some of the biggest ideas"
@laoneill "it's our job as researchers to keep reminding governments how important basic research is" "For Dev basic research being carried out in Ireland was a badge of pride"
@NeasaMcG Schrödinger's work in causality was not well received by the religious authorities at the time At the same time DIAS did have Catholic priests working on research projects in the early days, so there was not the conflict you might think between science and religion
@laoneill111 Schrödinger was very popular in social circles in Dublin, a bit of a renaissance man
@CormacORafferty Schrödinger was gifted at explaining difficult concepts
@CormacORafferty on how unsuccessful work, in Schrödinger's case, unified field theory, is just as important part of science. And no one has managed to crack it yet! And not forgetting the cat
@laoneill111 how Schrödinger's book inspired scientists to change fields and result in the finding of the double helix.
@NeasaMcG explaining how DIAS came about and how Schrödinger was attracted to Ireland #DIASdiscovers
Panel Discussion getting underway! @laoneill111 @CormacORafferty @NeasaMcG @MartinaPQuinn
We're half way through the documentary... Join us for the rest and the fascinating discussion to follow DM for link
@Stella15882 @NeasaMcG @HistFest @lukeoneil47 @CormacORafferty @MartinaPQuinn Stella, send me an email. I'll get a link to you communications@dias.ie
Starting in just over an hour we have limited tickets left for tonights broadcast and panel discussion. Get your free ticket now twitter.com/DIAS_Dublin/st…
Culture Night 2020 Booking Links! - Virtual Tour of DIAS Dunsink Observatory: eventbrite.ie/e/118043576515 - Earthquakes and other Geohazards: eventbrite.ie/e/earthquakes-… - Taifeadaí Cartlainne ó Scoil an Léinn Cheiltigh: eventbrite.ie/e/taifeadai-ca… Join us from 5pm! #CultureNight2020
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Meet some of our panelists for tomorrows discussion on the impact and legacy of the work carried out by Erwin Schroedinger during his time in Ireland as our first Director of Theoretical Physics Grab a free ticket here: eventbrite.ie/e/115984908985