Question
A form of this technique that is now ubiquitous in condensed matter physics gained prominence around the turn of the millennium, partly due to Scienta’s newly-released hemispherical electron analyzer. For 10 points each:
[10m] What technique’s “angle-resolved” form is often used to determine band structures?
ANSWER: photoemission spectroscopy [or PES or photoelectron spectroscopy; accept ARPES (“AR-pezz”) or angle-resolved photoemission spectroscopy or angle-resolved photoelectron spectroscopy; prompt on spectroscopy]
[10e] ARPES (“AR-pezz”) is often applied to these solids, whose well-defined unit cells may form part of orthorhombic or cubic systems.
ANSWER: crystals [or crystalline solids or crystal systems]
[10h] In 2015, ARPES was used to identify crystalline tantalum arsenide as an example of this state of matter in which two bands intersect near the Fermi energy, giving rise to record rates of second harmonic generation.
ANSWER: Weyl (“vile”) semimetal [prompt on semimetal]
<Physics>
Summary
| 2024 ACF Nationals | 2024-04-21 | Y | 24 | 13.33 | 88% | 29% | 17% |
Data
| Toronto A | Berkeley A | 0 | 10 | 0 | 10 |
| Brown | Yale A | 10 | 10 | 0 | 20 |
| Chicago C | Cornell B | 0 | 10 | 0 | 10 |
| Chicago D | Harvard | 0 | 0 | 0 | 0 |
| Claremont Colleges | Florida | 0 | 10 | 0 | 10 |
| Indiana | Cornell A | 10 | 10 | 10 | 30 |
| Iowa State | Illinois | 0 | 10 | 0 | 10 |
| McGill | Kentucky | 0 | 0 | 0 | 0 |
| Maryland | Georgia Tech | 0 | 0 | 0 | 0 |
| Michigan | Johns Hopkins | 0 | 10 | 0 | 10 |
| Chicago A | Minnesota A | 10 | 10 | 10 | 30 |
| Northwestern | NYU | 10 | 10 | 10 | 30 |
| Columbia A | North Carolina A | 10 | 10 | 0 | 20 |
| Berkeley B | North Carolina B | 10 | 10 | 0 | 20 |
| Duke | Penn | 0 | 10 | 0 | 10 |
| Texas | Purdue | 0 | 10 | 0 | 10 |
| Chicago B | Stanford | 10 | 10 | 0 | 20 |
| Toronto B | Rutgers | 0 | 10 | 0 | 10 |
| Truman State | South Carolina | 0 | 10 | 0 | 10 |
| Minnesota B | Vanderbilt | 0 | 10 | 0 | 10 |
| Columbia B | Virginia | 0 | 10 | 0 | 10 |
| Yale B | Arizona State | 0 | 10 | 0 | 10 |
| WUSTL A | Waterloo | 0 | 10 | 10 | 20 |
| WUSTL B | Ottawa | 0 | 10 | 0 | 10 |