Category: Presentations

At the 16th International Conference on Transport in Interacting Disordered Systems (TIDS16) in Granada, Spain I presented my work done with Miguel Ortuño and Andres Somoza on many-body localization (MBL). Specifically, these are the first large-system results using our method of displacement transformations to find the MBL integrals of motion.

A sneak peek: the accuracy of our method increases order by order and with increasing disorder. Download the full presentation as a pptx file (4.5 MB)

At the APS March Meeting 2016 in Baltimore I was giving an invited talk, with the title ‘New theoretical tools for quantum glasses, with and without quenched disorder’ (that’s talk F13.01). Now the APS allowed me to upload the slides and everything on their website, so if you missed the talk, please find the info here: https://absuploads.aps.org/presentation.cfm?pid=11532

At the KITP conference ‘KITP Conference: Aspects and applications of many-body localization‘ from 16 to 20 November, here in Santa Barbara, my collaborator Miguel Ortuño gave a presentation about the work we have been doing together on MBL.

You can watch the talk on the website of the KITP: http://online.kitp.ucsb.edu/online/mbl-c15/ortuno/

The slides of the presentation can be downloaded here, and the paper that explains our work in more detail is currently on the arXiv.

 

On June 30, 2015, I gave a talk at the SPICE-Workshop on Bad Metal Behavior in Mott Systems in Mainz – you can find the slides and more details about the workshop itself here.

The talk has been published online, available on Youtube:

At the SPICE-Workshop on Bad Metal Behavior in Mott Systems (June 29-July 2 2015) in Mainz, Germany, I was invited speaker. I gave a talk about glassy dynamics in theta-RbZn, the organic material that upon fast-cooling can avoid the charge ordering transition and gets into a disorderfree electron glass phase. At the hand of four characteristics of a glass – slow dynamics, a soft gap, short-range correlations and a rugged energy landscape – I discuss the results of our model of hoppings electrons with long-range Coulomb repulsion.

You can download the presentation here (pdf, 10 MB).

The talk has been posted on Youtube: click here to watch it!

From June 1 to June 5, 2015, the KITP hosted the conference ‘Closing the entanglement gap: Quantum information, quantum matter, and quantum fields,’ where I presented a poster on my recent (unpublished) work on the entanglement spectrum of a coplanar antiferromagnet. The entanglement entropy attains a logarithmic term from the tower of states, proportional to the number of Goldstone modes, the entanglement spectrum represents the full SO(3) symmetry of the tower of states.

You can download the poster here (pdf, 1.3 MB).

At 7 May 2015 I gave a public outreach talk for Café KITP at Club Soho in Santa Barbara, for a general audience, with the title ‘Quasiparticles – The Dreams That Stuff is Made Of‘. The idea is that I showed how in solid materials all new kind of ‘fundamental’ particles can arise known as ‘quasiparticles’. In fact, we can engineer any kind of particle – even particles that do not exist in the theory of fundamental particles (the Standard Model) like magnetic monopoles and ‘anyons’. The existence of quasiparticles underlies all modern electronic technology and will give rise no new technologies such as quantum computers.

Download the presentation here (pptx, 10 MB)

At the APS March Meeting 2015 I presented recent work on the Efros-Shklovskii Gap without disorder.

Abstract: Certain models of frustrated electron systems have been shown to self-generate glassy behavior, in the absence of disorder. Possible candidate materials contain quarter-filled triangular lattices with long-range Coulomb interactions, as found in the θ-family of organic BEDT-TTF crystals. In disordered insulators with localized electronic states, the so-called Coulomb glass, the single particle excitation spectrum displays the well-known Efros-Shklovskii gap. The same excitation spectrum is investigated in a class of models that display self-generated electronic glassiness, showing pseudogap formation related to the Efros-Shklovskii Coulomb gap. Our study suggests universal characteristics of all electron glasses, regardless of disorder.

Download the presentation here (pdf, 5.4 MB).