Semiconductor nanocrystals (NCs) are an emerging class of color-tunable, solution-processable, room-temperature single-photon sources. Photon antibunching in NCs arises from suppression of multiphoton emission by nonradiative Auger recombination. Here, we demonstrate a new antibunching mechanism - dynamic Coulomb blockade - which allows for generating both quantum and classical light from the same NC without detrimental effects of Auger decay. This mechanism is realized in novel dot-in-bulk (DiB) nanostructures comprising a quantum-confined CdSe core overcoated with a thick, bulk-like CdS shell. The presence of one hole in the core suppresses the capture of the second hole forcing it to recombine in the shell region. Under weak excitation, these NCs emit red antibunched light (core emission). At higher pump levels they exhibit an additional green band (shell emission) with bulk-like, Poissonian photon statistics. The unusual versatility of these novel nanoscale light sources, that combine mutually correlated channels for quantum and classical emission and additionally allow for facile tunability of effective color, opens new interesting opportunities for a range of applications from quantum optics to sensing and nanoscale imaging. © 2012 American Chemical Society.

Galland, C., Brovelli, S., Bae, W., Padilha, L., Meinardi, F., Klimov, V. (2013). Dynamic Hole Blockade Yields Two-Color Quantum and Classical Light from Dot-in-Bulk Nanocrystals. NANO LETTERS, 13(1), 321-328 [10.1021/nl3045316].

Dynamic Hole Blockade Yields Two-Color Quantum and Classical Light from Dot-in-Bulk Nanocrystals

BROVELLI, SERGIO;MEINARDI, FRANCESCO;
2013

Abstract

Semiconductor nanocrystals (NCs) are an emerging class of color-tunable, solution-processable, room-temperature single-photon sources. Photon antibunching in NCs arises from suppression of multiphoton emission by nonradiative Auger recombination. Here, we demonstrate a new antibunching mechanism - dynamic Coulomb blockade - which allows for generating both quantum and classical light from the same NC without detrimental effects of Auger decay. This mechanism is realized in novel dot-in-bulk (DiB) nanostructures comprising a quantum-confined CdSe core overcoated with a thick, bulk-like CdS shell. The presence of one hole in the core suppresses the capture of the second hole forcing it to recombine in the shell region. Under weak excitation, these NCs emit red antibunched light (core emission). At higher pump levels they exhibit an additional green band (shell emission) with bulk-like, Poissonian photon statistics. The unusual versatility of these novel nanoscale light sources, that combine mutually correlated channels for quantum and classical emission and additionally allow for facile tunability of effective color, opens new interesting opportunities for a range of applications from quantum optics to sensing and nanoscale imaging. © 2012 American Chemical Society.
Articolo in rivista - Articolo scientifico
Colloidal Nanocrystals, Core-shell quantuum dot
English
2013
13
1
321
328
none
Galland, C., Brovelli, S., Bae, W., Padilha, L., Meinardi, F., Klimov, V. (2013). Dynamic Hole Blockade Yields Two-Color Quantum and Classical Light from Dot-in-Bulk Nanocrystals. NANO LETTERS, 13(1), 321-328 [10.1021/nl3045316].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/40213
Citazioni
  • Scopus 62
  • ???jsp.display-item.citation.isi??? 59
Social impact