Event Status
Scheduled
Date and time: Today, 9:30 to 10:30 a.m.
Surprises from Growth of Highly Mismatched Semiconductor Alloys
mrsec.utexas.edu
512-232-9696
Wednesday, Apr 1st, 9:30-10:30 am
GLT 4.102
https://utexas.zoom.us/j/82683336638
Center for Dynamics and Control of Materials: MRSEC Seminar
In conventional semiconductors, adding small atoms decreases the lattice constant and increases the bandgap. But adding very small atoms like C or N actually decreases the bandgap, violating decades of intuition. The band anti-crossing (BAC) model explains this: the new atom introduces a state above the conduction band edge, and the two states repel each other. Ge:Cis especially intriguing because it has a direct bandgap and grows on Si, enabling on-chip lasers and silicon photonics.
Adding a larger atom might seem to restore conventional trends, but the bandgap sometimes increases and sometimes decreases, with contradicting results across research groups. Ab-initio (VASP) simulations show that highly mismatched atoms can be canceled out by atom arrangement, whether the mismatched atom is an anion, cation, or purely covalent.
Highly mismatched alloys (HMAs) want to segregate, and thermodynamics alone suggests they can't be grown. But kinetically-limited techniques like molecular beam epitaxy (MBE) have produced world record-setting lasers and solar cells. Photoluminescence from Ge:Cwith no detectable threading defects will also be shown.
HMAs are sensitive to contamination and surface damage during growth. Inattention produces unusual features such as nano-geodes (voids lined internally with tin) and "nanomarshmallows."
Assumptions about material growth and properties deserve periodic re-examination, no matter how widely accepted. AI may not be the only source of wrong intuition in the room.
Event Status
Scheduled
Date and time: Friday, April 3, 1 to 2 p.m.
Join TXST PREM CIMA for the upcoming PREM X MRSEC Seminar by Ahmed Sihorwala, UT MRSEC doctoral student in Dr. Brian Belardi's Lab, on Friday, April 3 from 1:00-2:00 p.m. streamed on Zoom. See attached abstract and biography.
Seminar Details
🗓️ Date: Friday, April 3
🕞 Time: 1:00–2:00 p.m.
💻 Join Virtually via Zoom: Meeting ID: 996 4975 3368, Passcode: PREM
Zoom Meeting Link: https://txstate.zoom.us/j/99649753368?pwd=MFhYZ3lQNTJWUklBSzZEd1BRSXZmQ…
Event Status
Scheduled
Date and time: April 6, 10 to 11 a.m.
Jan. 26th, Kent Zheng group
Feb. 9th, Adrianne, Annual Meeting Practice
Feb. 23rd, ????
March 9th, Zak Page group
March 23rd, ACS Meeting, no IRG1 meeting
April 6th, Dr. Neha Kamat (Northwestern Univ.), host Aniket Marne
April 20th, Brainstorming
May 4th, Jeanne Stachowiak
Event Status
Scheduled
Date and time: April 7, 2 to 3 p.m.
Learn the 10-slide method used by elite business consultants to scaffold any oral presentation. This method will help you find holes in your story ahead of time, put your slides in an order that facilitates smooth presentation, and help you feel confident heading into your next conference presentation or group meeting.
Event Status
Scheduled
Date and time: April 14, 9 a.m. to 4 p.m.
CIMA PREM students are shadowing researchers in the Stachowiak Lab!
Event Status
Scheduled
Date and time: April 14, 1 to 2 p.m.
Join us for a taco on April 14th at MER 1.606M!
Event Status
Scheduled
Date and time: April 17, 1 to 2:30 p.m.
Join us in the EER 2nd Floor lobby for our undergraduate research symposium!
Event Status
Scheduled
Date and time: April 20, 10 to 11 a.m.
Jan. 26th, Kent Zheng group
Feb. 9th, Adrianne, Annual Meeting Practice
Feb. 23rd, ????
March 9th, Zak Page group
March 23rd, ACS Meeting, no IRG1 meeting
April 6th, Dr. Neha Kamat (Northwestern Univ.), host Aniket Marne
April 20th, Brainstorming
May 4th, Jeanne Stachowiak
Event Status
Scheduled
Date and time: April 21, 2 to 3 p.m.
More info TBA