PMID- 34842440
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220716
IS  - 1530-6992 (Electronic)
IS  - 1530-6984 (Print)
IS  - 1530-6984 (Linking)
VI  - 21
IP  - 23
DP  - 2021 Dec 8
TI  - Stimulated Emission through an Electron-Hole Plasma in Colloidal CdSe Quantum 
      Rings.
PG  - 10062-10069
LID - 10.1021/acs.nanolett.1c03501 [doi]
AB  - Colloidal CdSe quantum rings (QRs) are a recently developed class of 
      nanomaterials with a unique topology. In nanocrystals with more common shapes, 
      such as dots and platelets, the photophysics is consistently dominated by 
      strongly bound electron-hole pairs, so-called excitons, regardless of the charge 
      carrier density. Here, we show that charge carriers in QRs condense into a hot 
      uncorrelated plasma state at high density. Through strong band gap 
      renormalization, this plasma state is able to produce broadband and sizable 
      optical gain. The gain is limited by a second-order, yet radiative, recombination 
      process, and the buildup is counteracted by a charge-cooling bottleneck. Our 
      results show that weakly confined QRs offer a unique system to study uncorrelated 
      electron-hole dynamics in nanoscale materials.
FAU - Roda, Carmelita
AU  - Roda C
FAU - Salzmann, Bastiaan B V
AU  - Salzmann BBV
AUID- ORCID: 0000-0002-8055-4681
AD  - Debye Institute for Nanomaterials Science, Utrecht University, 3508 TA Utrecht, 
      The Netherlands.
FAU - Wagner, Isabella
AU  - Wagner I
FAU - Ussembayev, Yera
AU  - Ussembayev Y
AUID- ORCID: 0000-0002-4779-9046
FAU - Chen, Kai
AU  - Chen K
AD  - The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, 
      Dunedin 9010, New Zealand.
FAU - Hodgkiss, Justin M
AU  - Hodgkiss JM
AUID- ORCID: 0000-0002-9629-8213
FAU - Neyts, Kristiaan
AU  - Neyts K
AUID- ORCID: 0000-0001-5551-9772
FAU - Moreels, Iwan
AU  - Moreels I
AUID- ORCID: 0000-0003-3998-7618
FAU - Vanmaekelbergh, Daniel
AU  - Vanmaekelbergh D
AD  - Debye Institute for Nanomaterials Science, Utrecht University, 3508 TA Utrecht, 
      The Netherlands.
FAU - Geiregat, Pieter
AU  - Geiregat P
AUID- ORCID: 0000-0001-7217-8738
LA  - eng
PT  - Journal Article
DEP - 20211129
PL  - United States
TA  - Nano Lett
JT  - Nano letters
JID - 101088070
SB  - IM
PMC - PMC9113625
OTO - NOTNLM
OT  - 2D materials
OT  - nanostructures
OT  - quantum rings
OT  - spectroscopy
OT  - stimulated emission
COIS- The authors declare no competing financial interest.
EDAT- 2021/11/30 06:00
MHDA- 2021/11/30 06:01
PMCR- 2022/05/17
CRDT- 2021/11/29 12:18
PHST- 2021/11/30 06:00 [pubmed]
PHST- 2021/11/30 06:01 [medline]
PHST- 2021/11/29 12:18 [entrez]
PHST- 2022/05/17 00:00 [pmc-release]
AID - 10.1021/acs.nanolett.1c03501 [doi]
PST - ppublish
SO  - Nano Lett. 2021 Dec 8;21(23):10062-10069. doi: 10.1021/acs.nanolett.1c03501. Epub 
      2021 Nov 29.