Thursday, October 29, 2015
Halloween Social
Join us at a Halloween-themed social on Friday, October 30th at 2:30pm in the Interaction Room. Bring your costume! There will be cider, hot chocolate, cookies, candy and physics grad students!
Friday, October 16, 2015
Mug Orders due Monday
PGSA mug orders are due Monday 10/19 at 5pm! They are $12 each, payable to the PGSA Paypal account (uiucpgsa@gmail.com). You can also pay via other methods to Erik Huemiller.
When you order, make sure to include your name, email, and which mug design you want ("This is a donut" or "Cooper Pair").
Student Colloquium 10/16
We are happy to announce that we have another Student colloquium this week. Please join us at 4:00pm today in Loomis 144 to hear about Sean Vig's work.
Title:
Characterization of the low-energy bosonic modes in Bi2Sr2CaCu2O8+x with incipient charge order
Abstract:
Cuprate high-temperature superconductors have been studied intensely for the past 30 years, understanding the mechanism responsible for superconductivity remains a significant challenge in condensed matter physics. Developing this understanding requires knowledge of both the fermionic charge excitations and many-body bosonic interactions that drive the associated emergent phenomena. Through work done through the Center for Emergent Superconductivity (CES), we have developed the technique of momentum-resolved electron energy-loss spectroscopy (M-EELS). M-EELS is capable of performing a full momentum-space mapping of the low-energy bosonic degrees of freedom over the first Brillouin zone with meV energy resolution, allowing us to characterize the interactions that give rise to collective electron dynamics. We present a study of the high-temperature superconductor material Bi2Sr2CaCu2O8+x (Bi2212) using M-EELS to measure low-energy electron dynamics. In optimally doped Bi2212, we find the emergence of static, short-range charge order at low temperature. The full measurement of χ"(q,ω) shows low-energy charge excitations, and resolving these excitations in momentum space, we see these excitations carry a similar structure to the charge order, suggesting that the static electronic order modulates the many-body interaction. We show that this observation is qualitatively consistent with features observed in the single particle spectral function by ARPES, namely the nodal dispersion anomaly, or “kink”.
Title:
Characterization of the low-energy bosonic modes in Bi2Sr2CaCu2O8+x with incipient charge order
Abstract:
Cuprate high-temperature superconductors have been studied intensely for the past 30 years, understanding the mechanism responsible for superconductivity remains a significant challenge in condensed matter physics. Developing this understanding requires knowledge of both the fermionic charge excitations and many-body bosonic interactions that drive the associated emergent phenomena. Through work done through the Center for Emergent Superconductivity (CES), we have developed the technique of momentum-resolved electron energy-loss spectroscopy (M-EELS). M-EELS is capable of performing a full momentum-space mapping of the low-energy bosonic degrees of freedom over the first Brillouin zone with meV energy resolution, allowing us to characterize the interactions that give rise to collective electron dynamics. We present a study of the high-temperature superconductor material Bi2Sr2CaCu2O8+x (Bi2212) using M-EELS to measure low-energy electron dynamics. In optimally doped Bi2212, we find the emergence of static, short-range charge order at low temperature. The full measurement of χ"(q,ω) shows low-energy charge excitations, and resolving these excitations in momentum space, we see these excitations carry a similar structure to the charge order, suggesting that the static electronic order modulates the many-body interaction. We show that this observation is qualitatively consistent with features observed in the single particle spectral function by ARPES, namely the nodal dispersion anomaly, or “kink”.
PGSA-VetMed Bar Crawl Mixer!
Come on out to
Quality at 9pm today for the first stop on our BAR CRAWL MIXER with the VetMed program! Make sure you WEAR RED so we can identify who is part of the group. VetMed people will be wearing blue.
When you arrive, find Brian to pick
up your BINGO card, which has various things you might see/do/order at a
bar. Once you've seen/done/drank it, you can mark it off the sheet. There will be several PRIZES for those who finish first!
Here is the full schedule:
9-10 - Quality
10-11 - Pig
11-12 - Esquire
12-2 - Guidos
Any changes to the schedule will be posted on twitter.
Subscribe to:
Posts (Atom)