Spin-polarized PL and raman spectroscopy of nanocrystal quantum dots in high magnetic fields

M. Furis, P. D. Robbins, T. Barrick, M. Petruska, Victor I Klimov, S. A. Crooker

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The ground state spectrum of an exciton in a quantum dot is strongly modified by the effects of quantum confinement and the correspondingly enhanced electron-hole exchange energy. Elucidation of this exciton spin structure via its evolution in applied magnetic field is the primary goal of this work. To this end we have developed techniques for spin-polarized resonant photoluminescence (PL) excitation spectroscopy in high magnetic fields. Using a tunable narrowband dye laser and a fiber-coupled probe designed for use in high-field magnets to 33 Tesla, we resonantly inject spin-polarized electrons and holes into nanocrystal quantum dots, and subsequently measure the quasi-resonant PL from either spin-up or spin-down excitons vs. magnetic field, at temperatures down to 1.7 K. The data shows clear evidence of low-energy Raman signals - e.g., sharp peaks of quantized acoustic phonons are well-resolved at energies 10 Tesla, at an energy of a few meV that is systematically dependent on nanocrystal radius (1.4-2.9 nm). The energy of this high field mode corresponds to the Zeeman splitting of the lowest optically allowed excitonic state in the quantum dots.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages709-710
Number of pages2
Volume772
DOIs
Publication statusPublished - Jun 30 2005
EventPHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 - Flagstaff, AZ, United States
Duration: Jul 26 2004Jul 30 2004

Other

OtherPHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27
CountryUnited States
CityFlagstaff, AZ
Period7/26/047/30/04

Fingerprint

nanocrystals
Raman spectroscopy
quantum dots
photoluminescence
magnetic fields
excitons
high field magnets
energy
dye lasers
narrowband
phonons
energy transfer
radii
ground state
fibers
acoustics
probes
spectroscopy
excitation
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Furis, M., Robbins, P. D., Barrick, T., Petruska, M., Klimov, V. I., & Crooker, S. A. (2005). Spin-polarized PL and raman spectroscopy of nanocrystal quantum dots in high magnetic fields. In AIP Conference Proceedings (Vol. 772, pp. 709-710) https://doi.org/10.1063/1.1994303

Spin-polarized PL and raman spectroscopy of nanocrystal quantum dots in high magnetic fields. / Furis, M.; Robbins, P. D.; Barrick, T.; Petruska, M.; Klimov, Victor I; Crooker, S. A.

AIP Conference Proceedings. Vol. 772 2005. p. 709-710.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Furis, M, Robbins, PD, Barrick, T, Petruska, M, Klimov, VI & Crooker, SA 2005, Spin-polarized PL and raman spectroscopy of nanocrystal quantum dots in high magnetic fields. in AIP Conference Proceedings. vol. 772, pp. 709-710, PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27, Flagstaff, AZ, United States, 7/26/04. https://doi.org/10.1063/1.1994303
Furis M, Robbins PD, Barrick T, Petruska M, Klimov VI, Crooker SA. Spin-polarized PL and raman spectroscopy of nanocrystal quantum dots in high magnetic fields. In AIP Conference Proceedings. Vol. 772. 2005. p. 709-710 https://doi.org/10.1063/1.1994303
Furis, M. ; Robbins, P. D. ; Barrick, T. ; Petruska, M. ; Klimov, Victor I ; Crooker, S. A. / Spin-polarized PL and raman spectroscopy of nanocrystal quantum dots in high magnetic fields. AIP Conference Proceedings. Vol. 772 2005. pp. 709-710
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