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XBn or XBp barrier detectors exhibit diffusion-limited dark currents comparable with mercury cadmium telluride Rule-07 and high quantum efficiencies. In 2011, SemiConductor Devices (SCD) introduced “HOT Pelican D”, a 640 × 512/15-μm pitch InAsSb/AlSbAs XBn mid-wave infrared (MWIR) detector with a 4.2-μm cut-off and an operating temperature of ∼150 K. Its low power (∼3 W), high pixel operability (>99...
A polarized picosecond laser pulse, which couples the bright exciton states to biexciton resonant states, is used to manipulate the exciton spin. We directly demonstrate this novel knob in a picosecond time-resolved two pulses experiment.
We study two photon absorption resonances in single semiconductor quantum dots, using polarization sensitive two beam time resolved spectroscopy. The rich spectrum of the biexciton resonances is fully understood, for the first time.
We use a resonant circularly polarized picosecond laser pulse to write a coherent superposition of exciton's states. We use a second, delayed circularly polarized pulse, tuned into the biexciton resonance to read the exciton's state.
We measure the polarization tomography of a novel radiative cascade, initiating from a matastable confined two-electron hole pairs state in which the holes form spin-triplet configuration, blockaded from thermalizing to their ground singlet state.
We demonstrate for the first time that the quantum dot confined dark exciton is a natural, coherent and long-lived qubit. We optically “write” its spin state and successfully “read” its subsequent coherent evolution.
We detect localized modes in a planar microcavity containing a layer of quantum dots and measure their spatial intensity distribution. Theory based on disorder induced most probable fluctuation in the dielectric constant explains our findings.
We detect localized modes in a planar microcavity containing a layer of quantum dots and measure their spatial intensity distribution. Theory based on disorder induced most probable fluctuation in the dielectric constant explains our findings.
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