jz1c02754_si_001.pdf (1.22 MB)
Download fileHyperfine-Induced Electron-Spin Dephasing in Negatively Charged Colloidal Quantum Dots: A Survey of Size Dependence
journal contribution
posted on 24.09.2021, 17:04 authored by Yuanyuan Zhang, Meizhen Jiang, Zhen Wu, Qing Yang, Yumeng Men, Lin Cheng, Pan Liang, Rongrong Hu, Tianqing Jia, Zhenrong Sun, Donghai FengThe electron spin relaxation processes
are complicated in semiconductor
quantum dots. Different spin relaxation mechanisms may result in an
increased or decreased spin relaxation rate with the size. The information
on size-dependent spin dynamics helps to clarify and better understand
the underlying spin relaxation processes. We investigate the size
dependence of the electron spin dynamics in negatively photocharged
CdSe and CdS colloidal quantum dots by time-resolved ellipticity spectroscopy.
It is revealed that the electron spin dephasings of photodoped electron
in zero or weak magnetic fields are dominated by the electron–nuclear
hyperfine interaction for all measured samples. The hyperfine-induced
electron spin dephasing time is ∼1–2 ns at room temperature
and decreases with decreasing the size D. In addition
to a size-dependent dephasing time that is directly proportional to D3/2, our measurements also show a size-independent
time component, likely due to the laser-induced nuclear spin ordering.
History
Usage metrics
Read the peer-reviewed publication
Categories
Keywords
weak magnetic fieldssemiconductor quantum dotsresolved ellipticity spectroscopynegatively photocharged cdsemeasurements also showindependent time componentelectron spin dynamicselectron spin dephasingsdependent dephasing timespin dephasingphotodoped electroninduced electronroom temperaturemeasured sampleslikely duedirectly proportionalbetter understand>< sup