If you’re interested in *my* talk, that information is here.
I’m really excited about the slate of events that FECS has put together for the 2023 March Meeting in Las Vegas. This includes Monday’s talk by Dr. Savannah Garmon “A trans perspective on building supportive and inclusive physics communities” and Tuesday’s FECS reception which will, for the first time since 2019, include complementary BEER. Hope to see you there!
Continue reading
Tomorrow (Thursday 3/18) I’m giving my talk at the March Meeting!
R20.00005: Field-induced freezing in the unfrustrated Ising antiferromagnet
Thursday, March 18, 9:12 AM–9:24 AM CDT
View in bulletin
Watch talk live
We study instantaneous quenches from infinite temperature to well below Tc in the two-dimensional (2D) square lattice Ising antiferromagnet in the presence of a longitudinal external magnetic field. Under single-spin-flip Metropolis algorithm Monte Carlo dynamics, this protocol produces a pair of metastable magnetization plateaus that prevent the system from reaching the equilibrium ground state except for some special values of the field. This occurs despite the absence of intrinsic disorder or frustration. We explain the plateaus in terms of local spin configurations that are stable under the dynamics. Although the details of the plateaus depend on the update scheme, the underlying principle governing the breakdown of ergodicity is quite general and provides a broader paradigm for understanding failures of ergodicity in Monte Carlo dynamics. See also: Iaizzi, Phys. Rev. E 102 032112 (2020), doi:10.1103/PhysRevE.102.032112
*Note: The views expressed here are the speaker’s, and do not necessarily represent the positions or policies of the AAAS STPF Program, the US Dept. of Energy, or the US Government.
Follow this finely crafted link to a dedicated page with more information about this work.
I just stumbled across these on the internet and they are both great. These are for Keynote (on macs) but there are probably equivalent settings on Powerpoint.
1. If you want to be able to switch apps while in presentation mode (e.g. to see the Zoom window). Look at this guide on the Zoom documentation. There is also a setting where you can make your cursor visible at all times so you can use it to point at things on your slides.
2. If you want to play your slideshow in a window (so it doesn’t take up the whole screen). Go into this mode first, then share the keynote window from Zoom. (Downside: you won’t be able to see your “presenter view” from keynote, just the slides at they appear to others.
The APS virtual March meeting is just around the corner! Although we are not meeting in person, FECS will spare no effort on ensuring a meeting that is as successful as before. We are hosting the following three invited sessions to highlight the contributions from early career scientists in science, industry, and international collaboration:
Continue reading
Scientists watch a lot of talks, and I’ve noticed a lot of people (including me) make the same handful of mistakes. Here are a few of my tips:
Disclaimer: I want to be 100% clear that these tips are not a veiled reference to anyone in particular.
After much delay, my March Meeting talk is finally online in all the right places! You can watch my talk on Virtual March Meeting or by following the link from the APS Bulletin, but I’ll also embed the video and post the slides here (PDF of slides).
As you’ve probably heard, the 2020 APS March Meeting was cancelled due to concerns over coronavirus. It was cancelled only 36 hours before it was scheduled to begin. Myself and many other scientists were already in Denver when we heard.
I just presented a talk “Quenching to field-stabilized magnetization plateaus in the unfrustrated Ising antiferromagnet” based on my preprint that I posted on arXiv last week at the Annual Meeting of the Physical Society of Taiwan at National Pingtung University in Pingtung, Taiwan. I haven’t gotten around to making a post about this paper yet (that is coming soon), but in the meantime I will post my slides from this talk here. My slides included some movies of the process of freezing in to magnetization plateaus. Since PDFs can’t include movies I will post the movies below.
Rubem Mondaini was kind enough to invite to visit his group and give a seminar at the Computational Science Research Center–Beijing. My talk, “Accessing Quantum Criticality with Magnetic Field Effects: Metamagnetism and Deconfinement” covered all of my work on the J-Q model, the saturation transitions in 1D and 2D (metamagnetism and zero-scale-factor universality) up to the latest updates on my work with Harley Scammell and Oleg Sushkov studying thermodynamics of field-induced spinons at the deconfined quantum critical point in the 2D J-Q model. I got some great feedback that will help me put the finishing touches on my manuscript.
After the seminar I had chance to meet with Rubem’s students and postdocs, Chen Cheng, Sabyasachi Tarat and Can Shao and learn about the fascinating things they are working on. After that, a delicious dinner!
I didn’t remember to get a picture of me at my talk, but I did get a photo of all of us out to dinner. I hope to be back to CSRC soon!
Title: Accessing Quantum Criticality with Magnetic Field Effects: Metamagnetism and Deconfinement
Abstract: Simple models of interacting quantum spins (like the Heisenberg model) are remarkable tools for understanding strong quantum fluctuations, but relatively few studies have considered the effects of external magnetic fields on these systems. I investigate the influence of magnetic fields in the J-Q model, an antiferromagnetic Heisenberg model with an added 4-spin interaction (Q). This model is known to harbor a direct, continuous phase transition between the Néel state and a valence-bond solid. This transition is believed to be an example of deconfined quantum criticality, where the excitations are exotic fractionalized particles known as spinons (S=1/2 bosons). We study the thermodynamics of the excitations and find direct evidence that they are indeed fractional. Separately, we also find that the four-spin term changes the nature of the saturation transition from “zero-scale-factor” universality to metamagnetism (magnetization jumps).
Today and tomorrow I’m visiting National Cheng Kung University (成功大學) in Tainan. I was graciously invited to give a seminar by Prof. Ching-Hao Chang (thanks!). If anyone reading this wants to chat, I’ll be visiting until Tuesday afternoon. I’m staying in the fourth-floor visitor’s office.
Title: Accessing quantum criticality with magnetic field effects: metamagnetism and deconfined quantum criticality
Abstract: Simple models of interacting quantum spins (like the Heisenberg model) are remarkable tools for understanding strong quantum fluctuations, but relatively few studies have considered the effects of external magnetic fields on these systems. I investigate the influence of magnetic fields in the J-Q model, an antiferromagnetic Heisenberg model with an added 4-spin interaction (Q). This model is known to harbor a direct, continuous phase transition between the Nel state and a valence-bond solid. This transition is believed to be an example of deconfined quantum criticality, where the excitations are exotic fractionalized particles known as spinons (S=1/2 bosons). We study the thermodynamics of the excitations and find direct evidence that they are indeed fractional. Separately, we also find that the four-spin term changes the nature of the saturation transition from “zero-scale-factor” universality to metamagnetism (magnetization jumps).
Adam Iaizzi, PhD （易亞丹） 