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Transient Spectroscopy of Glass-Embedded Perovskite Quantum Dots: Novel Structures in an Old Wrapping
Oleg V. Kozlov, Rohan Singh, Bing Ai +3
Semiconductor doped glasses had been used by the research and engineering communities as color filters or saturable absorbers well before it was realized that their optical propert…
Direct Measurements of Magnetic Polarons in CdMnSe Nanocrystals from Resonant Photoluminescence
W. D. Rice, W. Liu, V. Pinchetti +3
In semiconductors, quantum confinement can greatly enhance the interaction between band carriers (electrons and holes) and dopant atoms. One manifestation of this enhancement is th…
Spin-polarized Mn emission from Manganese-doped colloidal nanocrystals
R. Viswanatha, J. M. Pietryga, V. I. Klimov +1
We report magneto-photoluminescence studies of strongly quantum-confined "0-D" diluted magnetic semiconductors (DMS), realized in Mn-doped ZnSe/CdSe core/shell colloidal nan…
Revealing the Exciton Fine Structure in PbSe Nanocrystal Quantum Dots
R. D. Schaller, S. A. Crooker, D. A. Bussian +3
We measure the photoluminescence (PL) lifetime, , of excitons in colloidal PbSe nanocrystals (NCs) at low temperatures to 270~mK and in high magnetic fields to 15~T. For all NCs…
Anomalous circular polarization of magneto-photoluminescence from individual CdSe nanocrystals
H. Htoon, S. A. Crooker, M. Furis +3
We study the low-temperature magneto-photoluminescence (PL) from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting (0.5 meV) ex…
Direct Observation of Dark Excitons in Individual Carbon Nanotubes: Role of Local Environments
A. Srivastava, H. Htoon, V. I. Klimov +1
We report the direct observation of the spin-singlet dark excitonic state in individual single-walled carbon nanotubes through low-temperature micro-photoluminescence spectroscopy…
Carrier Multiplication in Nanocrystals via Photostimulated Generation of Biexcitons from Vacuum
Valery I. Rupasov, Victor I. Klimov
We propose a novel mechanism for photogeneration of multiexcitons by single photons (carrier multiplication) in semiconductor nanocrystals. In this mechanism, the Coulomb interacti…
The effect of Auger heating on intraband carrier relaxation in semiconductor quantumrods
Marc Achermann, Andrew P. Bartko, Jennifer A. Hollingsworth +1
The rate at which excited charge carriers relax to their equilibrium state affects many aspects of the performance of nanoscale devices, including switching speed, carrier mobility…
Different regimes of Forster energy transfer between an epitaxial quantum well and a proximal monolayer of semiconductor nanocrystals
S. Kos, M. Achermann, V. I. Klimov +1
We calculate the rate of non-radiative, Forster-type energy transfer (ET) from an excited epitaxial quantum well (QW) to a proximal monolayer of semiconductor nanocrystal quantum d…
High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy
R. D. Schaller, V. I. Klimov
We demonstrate for the first time that impact ionization (II) [the inverse of Auger recombination (AR)] occurs with very high efficiency in semiconductor nanocrystals (NCs). Interb…
Picosecond energy transfer in quantum dot Langmuir-Blodgett nanoassemblies
Marc Achermann, Melissa A. Petruska, Scott A. Crooker +1
We study spectrally resolved dynamics of Forster energy transfer in single monolayers and bilayers of semiconductor nanocrystal quantum dots assembled using Langmuir-Blodgett (LB)…