@article{ea2211a5b7104a49811102180c139ca9,
title = "Determination of the In-Plane Exciton Radius in 2D CdSe Nanoplatelets via Magneto-optical Spectroscopy",
abstract = "Colloidal, two-dimensional semiconductor nanoplatelets (NPLs) exhibit quantum confinement in only one dimension, which results in an electronic structure that is significantly altered compared to that of other quantum-confined nanomaterials. Whereas it is often assumed that the lack of quantum confinement in the lateral plane yields a spatially extended exciton, reduced dielectric screening potentially challenges this picture. Here, we implement absorption spectroscopy in pulsed magnetic fields up to 60 T for three different CdSe NPL thicknesses and lateral areas. Based on diamagnetic shifts, we find that the exciton lateral extent is comparable to NPL thickness, indicating that the quantum confinement and reduced screening concomitant with few-monolayer thickness strongly reduces the exciton lateral extent. Atomistic electronic structure calculations of the exciton size for varying lengths, widths, and thicknesses support the substantially smaller in-plane exciton extent.",
keywords = "Diamagnetic shift, electronic structure, exciton size, nanoplatelets, quantum confinement",
author = "Alexandra Brumberg and Harvey, {Samantha M.} and Philbin, {John P.} and Diroll, {Benjamin T.} and Byeongdu Lee and Crooker, {Scott A.} and Wasielewski, {Michael R} and Eran Rabani and Schaller, {Richard Daniel}",
note = "Funding Information: This material is based upon work supported by the National Science Foundation under Grant Nos. DMREF-1629383 and DMREF-1629361, as well as by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1324585 (A.B., S.M.H.). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement Nos. DMR-1157490 and 1644779, the U.S. Department of Energy, and the State of Florida. This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award DE-FG02-99ER14999. This research used resources of the Advanced Photon Source (Argonne National Laboratory) and the National Energy Research Scientific Computing Center (NERSC), which are U.S. Department of Energy (DOE) Office of Science User Facilities operated under Contract Nos. DE-AC02-06CH11357 and DE-AC02-05CH11231, respectively. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Funding Information: This material is based upon work supported by the National Science Foundation under Grant Nos. DMREF-1629383 and DMREF-1629361 as well as by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1324585 (A.B., S.M.H.). A portion of this work was performed at the National High Magnetic Field Laboratory which is supported by National Science Foundation Cooperative Agreement Nos. DMR-1157490 and 1644779, the U.S. Department of Energy, and the State of Florida. This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award DE-FG02-99ER14999. This research used resources of the Advanced Photon Source (Argonne National Laboratory) and the National Energy Research Scientific Computing Center (NERSC), which are U.S. Department of Energy (DOE) Office of Science User Facilities operated under Contract Nos. DE-AC02-06CH11357 and DE-AC02-05CH11231, respectively. Use of the Center for Nanoscale Materials, an Office of Science user facility was supported by the U.S. Department of Energy, Office of Science Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = aug,
day = "27",
doi = "10.1021/acsnano.9b02008",
language = "English (US)",
volume = "13",
pages = "8589--8596",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "8",
}