Semiconductor quantum emitters under light-matter coupling conditions
CFM Seminars
- Speaker
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Victor Krivenkov, CFM
- When
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2023/03/08
13:00 - Place
- Auditorium, Centro de Fisica de Materiales
- Add to calendar
-
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The field of quantum technology has been rapidly expanding in the past
decades, yielding numerous applications for quantum computation and
simulation, quantum communication and key distribution, quantum metrology,
sensing, and imaging. One of the central building blocks for photon-based
quantum technologies is a quantum emitter (QE), a controllable source of
photons. Semiconductor quantum dots (QDs) is one of the most prospective types
of solid-state QEs due to the high photon emission efficiency and the
possibility of the flexible control of their spectral properties by changing
their size and structure. In our recent studies, QDs already have proven
themselves as a promising nano-antennas (transferring the absorbed photons to
other materials), and as a stable photoluminescence source [1] with unique
nonlinear absorption properties allowing the up-converted photoluminescence
[2], for the light-harvesting applications [3] and bio-labeling [4]. Moreover,
QDs have established themselves as a promising material for the design of
single-photon QEs for quantum information applications [5], but still can’t
be used as a source of photon-pairs emission on-demand due to the low
photoluminescence quantum yield of biexciton state emitting photon pairs.
Overcoming this limitation can be implemented through the light-matter
coupling of QDs with optical micro- or plasmonic nano-cavities. In contrast to
optical cavities, plasmonic nanocavities allow much better localization of
electromagnetic modes on the nanometer scale, and the highest radiative rate
acceleration factors that allow highly efficient photoluminescence and on-
demand emission of photon pairs from a single QD by coupling of excitons with
plasmons and forming plexcitons [6,7]. Moreover, the plasmon-exciton coupling
enhances the nonlinear optical properties of QDs making them even more
efficient up-conversion sources [8,9]. The next step in the design and
operation of plexciton-based QEs is a control of the optical properties on the
level of the single QE without changing the structure and/or morphology of QD.
By tuning the light-matter coupling efficiency, the properties of QDs may be
reversibly modulated thus switching the operation mode between single-photon
emission mode and two-photon emission mode. Moreover, for future research, I
propose the use of the plasmon-optical hierarchical cavities, which may allow
reaching not only a weak also, with a high likelihood, strong and even
ultrastrong coupling regime, thus mixing the properties of light and matter
and allowing more QE properties to be tuned in more substantial ways without
changing the QD original structure. The proposed research gives the prospect
of unveiling new possibilities of controlling the quantum properties of
photons emitted by solid-state QEs and opening up new areas of fundamental and
practical research.
1\. Krivenkov, V. et al. (2018). J. Phys. Chem. C, 122(27), 15761-15771.
2\. Krivenkov, V. et al. (2020). ACS photonics, 7(3), 831-836.
3\. Krivenkov, V. et al. (2019). Biosensors and Bioelectronics, 137, 117-122.
4\. Nifontova, G., Krivenkov, V. et al. (2020). ACS applied materials &
interfaces, 12(32), 35882-35894.
5\. Uppu, R. et al. (2021). Nature nanotechnology, 16(12), 1308-1317.
6\. Krivenkov, V., … A., Grzelczak, … I., Rakovich, Y. (2019). J. Phys.
Cham. Lett., 10(3), 481-486.
7\. Krivenkov, V., … Rakovich, Y. P. (2020). J. Phys. Cham. Lett., 11(19),
8018-8025.
8\. Krivenkov, V., … Grzelczak, M., … Rakovich, Y. (2021). Nanoscale,
13(8), 4614-4623.
9\. Krivenkov, V., et al. (2021). Nanoscale, 13(47), 19929-19935.
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