期刊
PHYSICAL REVIEW B
卷 83, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.201309
关键词
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资金
- European Union [PIEF-GA-2008-220901]
- Welcome Trust
- EPSRC UK Research Council [EP/I005072/1]
- BelSPo
- EPSRC [EP/I005072/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I005072/1] Funding Source: researchfish
Using a sensitive transient four-wave mixing technique in heterodyne detection, we measured the ground-state excitonic dephasing in PbS colloidal quantum dots of 4-6-nm diameter in the temperature range from 5 to 100 K. We observe an ultrafast (<100 fs) initial decay followed by a component of about 300 fs at 5 K, which becomes faster with decreasing dot size and increasing temperature. This dynamics is attributed to pure dephasing of phonon-assisted transitions in the peculiar band structure of PbS, which allows coupling to phonons with wave vectors both near the Brillouin zone center and near the (100) zone edge, the X point. We estimate an upper limit of 7% for the weight of the zero-phonon line with 2.6-ps spin-flip limited dephasing.
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