Characterization of the local charge environment of a single quantum dot via resonance fluorescence

Chen, Disheng; Lander, Gary R.; Krowpman, Kyle S.; Solomon, Glenn S.; Flagg, Edward B.

doi:10.1364/cleo_qels.2016.ftu1d.6

Cited by 4 publications

(9 citation statements)

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“…First, we show that light from a weak above-band laser can improve the brightness of a resonantly pumped QD transition by a factor larger than 30 and reduces its inhomogeneous transition linewidth by a factor of about 2. The brightness improvement has been previously reported [18,19,27], but to our knowledge, the linewidth narrowing has not. Second, we show using both experimental data and Monte Carlo simulations that a carrier loss term that depends on the resonant laser power is present and to our knowledge has not been previously discussed.…”

Section: Introductionsupporting

confidence: 60%

Effects of resonant-laser excitation on the emission properties in a single quantum dot

Gazzano¹,

Huber²,

Loo³

et al. 2018

Optica

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Gazzano, O.; Huber, T.; Loo, V.; Polyakov, S.; Flagg, E.B.; and Solomon, G.S., "Effects of resonant-laser excitation on the emission properties in a single quantum dot" (2018). Faculty Scholarship. 1560.While many solid-state emitters can be optically excited non-resonantly, resonant excitation is necessary for many quantum information protocols as it often maximizes the non-classicality of the emitted light. Here, we study the resonance fluorescence in a solid-state system-a quantum dot-with the addition of weak, non-resonant light. In the inelastic scattering regime, changes in the resonance fluorescence intensity and linewidth are linked to both the nonresonant and resonant laser powers. Details of the intensity change indicate that charge-carrier loss from the quantum dot is resonant laser. As we enter the Mollow triplet regime, this resonant laser loss term rate is approximately 1∕50 ns −1 . This work further clarifies resonance fluorescence in solid-state systems and will aid in the further improvement of solid-state non-classical light sources.OCIS codes: (300.6280) Spectroscopy, fluorescence and luminescence; (250.5590) Quantum-well, -wire and -dot devices.

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Section: Introductionsupporting

confidence: 60%

Effects of resonant-laser excitation on the emission properties in a single quantum dot

Gazzano¹,

Huber²,

Loo³

et al. 2018

Optica

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“…However, its evident dependence upon excitation power implies that the resonant laser must also modify the fraction of time that the QD spends in the neutral state. This behavior is consistent with measurements on other QD systems [61,145] and will be addressed in detail in the next Chapter.…”

Section: Ac Stark Shiftssupporting

confidence: 87%

“…As in previous resonant excitation experiments [61,145], a small amount of above band-gap excitation is needed to allow resonance fluorescence from the neutral exciton state by neutralizing the intrinsic charges captured by the QD. The fluorescence of QD1 studied in this work is 23 times brighter when introducing 2.19 nW of HeNe laser light (632 nm) onto the sample compared to the case of no above band-gap illumination.…”

Section: Methodsmentioning

confidence: 99%

“…The calculation is enabled by employing multiple-tau algorithm, where the photon events are firstly histogrammed to binned intensities at different times, and then the correlation is calculated between these binned intensities. By varying the bin size exponentially, a second-order correlation function with logarithmically varying time can be extracted, as shown in references [125] and [145].…”

Section: Appendixmentioning

confidence: 99%

“…The data are then fitted with an exponential decay convolved with the measured instrument response function [IRF is given inFigure 2.6(e)]. The lifetime T is determined to be the statistical average of these three fitting results: T = (570 ± 9) ps, since T shows no dependence on the above-band excitation power[145].…”

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confidence: 99%

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Three Essays on Time-Varying Risk Aversion and Investor Sentiment

Chen¹

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Light-matter interactions in semiconductor nanostructures have attracted significant research interest because of both fundamental physics questions and practical concerns. Epitaxially grown quantum dots (QDs), with their narrow emission linewidths and atom-like density of states in a solid state system, are archetypical elements of study and are potentially useful for many applications, such as on-demand single photon emitters [1,2], efficient entangled photon-pair sources [3,4], and cavity quantum electrodynamics (QED) research [5-11]. Most experiments employ resonant or near-resonant excitation to directly interact with the bound states, which enables high excitation efficiency, precise control of quantum states, and minimal disturbance of the local environment. However, the inevitable doping of the material in growth introduces an intrinsic free charge carrier reservoir that enables charge fluctuations of the QD and defects in its surrounding local environment. The direct consequences are fluorescent intermittency (or blinking) in a QD's emission, and spectral diffusion of the QD's energy level. Both effects pose challenges for using these photons as flying qubits to realize a quantum network or linear optical quantum computing. Blinking compromises the properties of these QDs useful for generating on-demand single photons. Characterizing these charge dynamics and understanding the underlying physics is critical for hunting potential methods to suppress them. In this dissertation, by examining the excitation spectra of the QD and the photon statistics of its emission, we are able to determine the possible trap locations and the time scale of these charge dynamics. In fact, the temporal correlation measurement captures both the non-classical nature of these quantum emitters and the charge dynamics of both the QD and nearby defects. This information helps identify the nature of these charge traps, and provides the clues for suppressing these electric fluctuations; for example, by modifying the sample growth parameters or fabricating additional nano-structures on the sample to deplete the free charge carriers. I would like to express my sincere gratitude to my advisor, Prof. Dr. Edward B. Flagg, for his patient guidance, amiable encouragement, intellectual enlightenment and generous advice throughout my time as his student. As a professor, he showed me the path and prospects of being a scientific researcher with constant passion, curiosity, and dedication, which motivates me to master the physics and tackle the unknown. As a supervisor, he devoted considerate care on not only the academic job of his students, but also their future career as a person. These interactions alleviate the stress of being a Ph.D. candidate and make the pursuing journey more enjoyable and pleasant. I have been extremely lucky to have a supervisor who values the teaching and educating of new generation of physicists appreciably, and who engages in the commitments with substantial efforts. I deeply appreciate these practice since it not o...

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Resonant excitation of nanowire quantum dots

et al. 2020

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GaAs quantum dots in nanowires are one of the most promising candidates for scalable quantum photonics. They have excellent optical properties, can be frequency-tuned to atomic transitions, and offer a robust platform for fabrication of multi-qubit devices that promise to unlock the full technological potential of quantum dots. Coherent resonant excitation is necessary for virtually any practical application because it allows, for instance, for on-demand generation of single and entangled photons, photonic clusters states, and electron spin manipulation. However, emission from nanowire structures under this excitation scheme has never been demonstrated. Here we show, for the first time, biexciton–exciton cascaded emission via resonant two-photon excitation and resonance fluorescence from an epitaxially grown GaAs quantum dot in an AlGaAs nanowire. We also report that resonant excitation schemes, combined with above-bandgap excitation, can be used to clean and enhance the emission of nanowire quantum dots.

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Characterization of the local charge environment of a single quantum dot via resonance fluorescence

Cited by 4 publications

References 4 publications

Effects of resonant-laser excitation on the emission properties in a single quantum dot

Effects of resonant-laser excitation on the emission properties in a single quantum dot

Three Essays on Time-Varying Risk Aversion and Investor Sentiment

Resonant excitation of nanowire quantum dots

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