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Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetime
We investigate the strongly temperature-dependent radiative lifetime of electron–hole excitations in colloidal CdSe nanocrystal quantum dots over nearly three orders of magnitude in temperature (300
Magnetooptics of Exciton Rydberg States in a Monolayer Semiconductor.
The strongly field-dependent and distinct energy shifts of the 2s, 3s, and 4s excited neutral excitons permits their unambiguous identification and allows for quantitative comparison with leading theoretical models.
Imaging Spin Transport in Lateral Ferromagnet/Semiconductor Structures
Electrical spin injection and accumulation in the gallium arsenide channel of lateral spin-transport devices are imaged, indicating that electron spins are polarized by reflection from the ferromagnetic drain contact.
Spectroscopy of spontaneous spin noise as a probe of spin dynamics and magnetic resonance
Correlation spectra of the measured spin noise reveal g-factors, nuclear spin, isotope abundance ratios, hyperfine splittings, nuclear moments and spin coherence lifetimes—without having to excite, optically pump or otherwise drive the system away from thermal equilibrium, suggesting a possible route towards non-perturbative, sourceless magnetic resonance of small systems.
Spin noise of electrons and holes in self-assembled quantum dots.
A large, energy-dependent anisotropy of the in-plane hole g factor is clearly exposed, reflecting systematic variations in the average QD confinement potential.
Spectrally resolved dynamics of energy transfer in quantum-dot assemblies: towards engineered energy flows in artificial materials.
Time-resolved and spectrally resolved photoluminescence directly reveals the energy-dependent transfer rate of excitons from smaller to larger dots via electrostatic coupling, and suggests that interdot energy transfer can approach picosecond time scales in structurally optimized systems.
Electrical detection of spin transport in lateral ferromagnet–semiconductor devices
The development of semiconductor spintronics requires a reliable electronic means for writing, processing and reading information using spin-polarized carriers. Here, we demonstrate a fully
Breakdown of volume scaling in Auger recombination in CdSe/CdS heteronanocrystals: the role of the core-shell interface.
Investigation of multiexciton dynamics in hetero-NCs composed of CdSe cores and CdS shells of tunable thickness observes a dramatic decrease in the AR rates at the initial stage of shell growth, which cannot be explained by traditional volume scaling alone.
Exciton diamagnetic shifts and valley Zeeman effects in monolayer WS2 and MoS2 to 65 Tesla
Low-temperature polarized reflection spectroscopy of atomically thin WS2 and MoS2 in high magnetic fields to 65 T is reported, thereby quantifying the valley Zeeman effect in monolayer transition-metal disulphides.
Nano-engineered electron–hole exchange interaction controls exciton dynamics in core–shell semiconductor nanocrystals
A nanoengineering-based approach is demonstrated that provides control over EI while maintaining nearly constant emission energy in core–shell CdSe/CdS NCs with a variable shell width and can be applied to other nanostructures with variable electron–hole overlap.