Radio-frequency stress-induced modulation of CdTe/ZnTe quantum dots

We demonstrate radio-frequency tuning of the energy of individual CdTe/ZnTe quantum dots (QDs) by Surface Acoustic Waves (SAWs). Despite the very weak piezoelectric coefficient of ZnTe, SAW in the GHz range can be launched on a ZnTe surface using interdigitated transducers deposited on a c-axis orie...

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Veröffentlicht in:Journal of applied physics 2020-06, Vol.127 (23)
Hauptverfasser: Tiwari, V., Makita, K., Arino, M., Morita, M., Crozes, T., Bellet-Amalric, E., Kuroda, S., Boukari, H., Besombes, L.
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Sprache:eng
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Zusammenfassung:We demonstrate radio-frequency tuning of the energy of individual CdTe/ZnTe quantum dots (QDs) by Surface Acoustic Waves (SAWs). Despite the very weak piezoelectric coefficient of ZnTe, SAW in the GHz range can be launched on a ZnTe surface using interdigitated transducers deposited on a c-axis oriented ZnO layer grown on ZnTe containing CdTe QDs. The photoluminescence (PL) of individual QDs is used as a nanometer-scale sensor of the acoustic strain field. The energy of QDs is modulated by SAW in the GHz range and leads to the characteristic broadening of time-integrated PL spectra. The dynamic modulation of the QD PL energy can also be detected in the time domain using phase-locked time domain spectroscopy. This technique is, in particular, used for monitoring complex local acoustic fields resulting from the superposition of two or more SAW pulses in a cavity. Under a magnetic field, the dynamic spectral tuning of a single QD by SAW can be used to generate single photons with alternating circular polarization controlled in the GHz range.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0011124