Carrier-transfer dynamics between neutral and charged excitonic states in a single quantum dot probed with second-order photon correlation measurements

Nakajima, Hirochika; Kumano, H.; Iijima, H.; Odashima, Satoru; Suemune, I.

doi:10.1103/physrevb.88.045324

Cited by 9 publications

(12 citation statements)

References 43 publications

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“…4(b)). This is similar to previous work on resonantly excited QDs 27,28,[34][35][36] , but here the behavior is more complicated. For the QD used in this study, the data indicate that there are two nearby charge traps within 70 nm.…”

Section: Discussionsupporting

confidence: 88%

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

et al. 2016

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We study the photon-statistical behavior of resonance fluorescence from self-assembled InAs quantum dots (QDs) as a function of the density of free charge carriers introduced by an above band-gap laser. Second-order correlation measurements show bunching behavior that changes with aboveband laser power and is absent in purely above-band excited emission. Resonant photoluminescence excitation spectra indicate that the QD experiences discrete spectral shifts and continuous drift due to changes in the local charge environment. These spectral changes, combined with tunneling of charges from the environment to the QD, provide an explanation of the bunching observed in the correlations.

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Section: Discussionsupporting

confidence: 88%

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

et al. 2016

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“…5(b)]. This is similar to previous work on resonantly excited QDs [60][61][62]137,176], but here the behavior is more complicated. For the QD used in this study, the data indicate that there are two nearby charge traps within 70 nm.…”

Section: Resultssupporting

confidence: 84%

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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“…Distinction between the charged and neutral excitons has mainly been made based on linear-polarization-resolved measurements and the lack of fine structure splitting for the CX in contrast to the X emission line, 23,24 additionally supported by cross-correlation of the photon emission from both X and CX complexes exhibiting a characteristic line shape of the second order correlation function. 24,25 Figure 1(a) presents a low-temperature (T ¼ 5 K) lPL spectrum consisting of a neutral (at 0.7988 eV) and charged exciton (at 0.7948 eV) emission features from a single InAs/ InGaAlAs/InP QDash. The energy distance between both spectral lines is about 4 meV, which defines the charged exciton binding energy in this QDash.…”

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confidence: 99%

Single photon emission at 1.55 μm from charged and neutral exciton confined in a single quantum dash

Dusanowski¹,

Syperek²,

Mrowiński³

et al. 2014

Applied Physics Letters

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Carrier-transfer dynamics between neutral and charged excitonic states in a single quantum dot probed with second-order photon correlation measurements

Cited by 9 publications

References 43 publications

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

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

Three Essays on Time-Varying Risk Aversion and Investor Sentiment

Single photon emission at 1.55 μm from charged and neutral exciton confined in a single quantum dash

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