Question
Photons in semiconductor lasers such as VCSELs (“VICK-sulls”) are produced by radiative recombination of electrons and these particles. For 10 points each:
[10e] Name these positively-charged quasiparticles that are the majority carriers in p-type semiconductors.
ANSWER: electron holes [reject “holons”]
[10m] Recombination of electrons and holes occurs in one of these heterostructures sandwiched between two sets of Bragg reflectors in the VCSEL geometry. Layers of different semiconductors with different bandgaps provide an effective potential for confinement in these heterostructures.
ANSWER: quantum wells [prompt on wells]
[10h] A superlattice of quantum wells appears in this other design of semiconductor lasers proposed by Kazarinov and Suris. In this design, electrons tunnel between quantum wells and emit light by intersubband (“inter-sub-band”) transitions.
ANSWER: quantum cascade laser [prompt on QCL]
<DC, Physics>
Summary
| 2024 Chicago Open | 07/28/2024 | Y | 12 | 12.50 | 92% | 8% | 25% |
Data
| A Nervy Liberal Nanny Hence | Les Missourables | 10 | 0 | 0 | 10 |
| We Need New Names | Galvanized Square Steen and Eco-Friendly Wood Vermeer | 10 | 0 | 0 | 10 |
| I’ll take a quiet 10 / A handshake of CO (Chicago Open) | The Jeam Team | 10 | 0 | 0 | 10 |
| LMM's LLM MLM | Charlotte's Moderately Successful Team | 10 | 0 | 10 | 20 |
| AMOGH QUIZ HACK? 英雄联盟 400 PPG 24 TUH | Mindgoblin of Little Hobbes | 0 | 0 | 0 | 0 |
| BHSU B | NJTRANSit (and anwen, I guess) | 10 | 10 | 10 | 30 |
| Lisan al-Quib | SAYYID QUTB, DRIVING THE LONGEST CAR YOU’VE EVER SEEN THROUGH TAHRIR SQUARE | 10 | 0 | 0 | 10 |
| Berkeley Mafia and the Chicago Boy | The Oldest Men in the World | 10 | 0 | 0 | 10 |
| it's the great pumpkinification objection, charlie brown | There are buzzable clues everywhere for those with eyes to see | 10 | 0 | 0 | 10 |
| sticking out your guyot for the ridge push; you're so seafloor spread, you're so fracture zone | NJTRANSit (and bobby, i guess) | 10 | 0 | 10 | 20 |
| var merchants | Lying on a Mattress at Lou’s Apartment in Pilsen, Chicago | 10 | 0 | 0 | 10 |
| when you look this good, you don’t have to know anything | genAI this, genAI that, have you found your 真爱 yet | 10 | 0 | 0 | 10 |