2012/12/31 by Galan Moody, G. Moody, R. Singh +14 · 46 citations
Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Biexciton #Chemistry #Coherence (philosophical gambling strategy) #Coherence time #Condensed matter physics #Dephasing #Exciton #Molecular physics #Optics #Physics #Population #Quantum Dots Synthesis And Properties #Quantum mechanics #Radiative transfer #Semiconductor Quantum Structures and Devices #Spectroscopy #Spectroscopy and Quantum Chemical Studies #cond-mat.mes-hall
paper · pdf · doi:10.1016/j.ssc.2013.03.025
published in Solid State Communications 163, 65-69 (Elsevier BV)
arxiv created 2012/12/31 · openalex publication_date 2013/03/30 · arxiv updated 2013/08/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Exchange-mediated fine-structure splitting of bright excitons in an ensemble of InAs quantum dots is studied using optical two-dimensional Fourier-transform spectroscopy. By monitoring the non-radiative coherence between the bright states, we find that the fine-structure splitting decreases with increasing exciton emission energy at a rate of 0.1 μeV/meV. Dephasing rates are compared to population decay rates to reveal that pure dephasing causes the exciton optical coherences to decay faster than the radiative limit at low temperature, independent of excitation density. Fluctuations of the bright state transition energies are nearly perfectly-correlated, protecting the non-radiative coherence from interband dephasing mechanisms.