Control of Wigner localization and electron cavity effects in near-field emission spectra of In(Ga)P/GaInP quantum-dot structures

Mintairov, A. M.; Kapaldo, James; Merz, J. L.; Rouvimov, Sergei; Lebedev, D. V.; Kalyuzhnyy, N. A.; Mintairov, S. A.; Belyaev, K. G.; Rakhlin, M. V.; Торопов, А. А.; Brunkov, P. N.; Vlasov, A. S.; Zadiranov, Yu. M.; Blundell, S. A.; Можаров, А. М.; Mukhin, I. S.; Yakimov, Michail M.; Oktyabrsky, S.; Shelaev, A. V.; Быков, В. А.

doi:10.1103/physrevb.97.195443

Cited by 22 publications

(36 citation statements)

References 32 publications

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“…The measured InP/GaInP 2 QDs (see Appendix A.1 for growth details) had a flat lens shape, a lateral size D ~50–180 nm, up to 20 electrons and a Wigner-Seitz radius of up to r s ~5, as described in [ 22 , 25 ]. The dots revealed a small elongation and asymmetry, which, in most cases, could be described as a combination of a ~5% elliptical distortion ( D ||/ D ⊥ = 1.05) and a 10% change of R ⊥.…”

Section: Single-electron Inp/gainp 2 Qdsmentioning

confidence: 99%

“…Since the QDs had a wide range of sizes, electron populations and B bi , the measurements presented certain technical challenges (including luck), the main one being the tedious scanning process to find the appropriate dot for a specific study, and separating its spectrum from neighboring dots. In our experiments, QDs with different electron populations were selected using analysis of the number of spectral features in PL spectra, as described in detail in [ 25 ]. The spectra were measured at 10 K and an external magnetic field B e = 0–10 T.…”

Section: Single-electron Inp/gainp 2 Qdsmentioning

confidence: 99%

“…Here, we present the data for eight dots, denoted S00, S02, S03, S04, S09, S10, S11 and S12. Table 1 contains a list of these dots, their type (see below) and parameters, such as, quantum confinement ( ħω 0 ), D , r s , E 0 , x Ga , the separation of the electrons in a photo-excited state d WM , and B bi (see [ 25 ]). The type and parameters were determined using magneto-PL spectra (see Appendix B.1 for spectra processing).…”

Section: Single-electron Inp/gainp 2 Qdsmentioning

confidence: 99%

“…These features, which indicate that these are nearly identical dots, are clearly seen in Figure 1 c, in which we compare their spectra. In Figure 1 d, we compare an NSOM image of the S10 dot (see [ 25 ]), d WM estimated from the experimental spectrum (see below) and the calculated electron density for this dot for B e = 0. The measured data and the calculation are in excellent agreement.…”

Section: Magneto-pl Spectra: Experimentsmentioning

confidence: 99%

“…Their detailed characterization including optical (steady-state and time-resolved photoluminescence, photo-reflection, Raman spectroscopy, conventional and nano-indentation near-field scanning optical microscopy) together with and structural (cross-section and plan-view transmission electron microscopy) is presented in Refs. [ 25 , 26 , 37 , 38 ].…”

Section: Appendix A1 Structure Growthmentioning

confidence: 99%

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Fractional Charge States in the Magneto-Photoluminescence Spectra of Single-Electron InP/GaInP2 Quantum Dots

et al. 2021

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We used photoluminescence spectra of single electron quasi-two-dimensional InP/GaInP2 islands having Wigner-Seitz radius ~4 to measure the magnetic-field dispersion of the lowest s, p, and d single-particle states in the range 0–10 T. The measured dispersion revealed up to a nine-fold reduction of the cyclotron frequency, indicating the formation of nano-superconducting anyon or magneto-electron (em) states, in which the corresponding number of magnetic-flux-quanta vortexes and fractional charge were self-generated. We observed a linear increase in the number of vortexes versus the island size, which corresponded to a critical vortex radius equal to the Bohr radius and closed-packed topological vortex arrangements. Our observation explains the microscopic mechanism of vortex attachment in composite fermion theory of the fractional quantum Hall effect, allows its description in terms of self-localization of ems and represents progress towards the goal of engineering anyon properties for fault-tolerant topological quantum gates.

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Section: Single-electron Inp/gainp 2 Qdsmentioning

confidence: 99%

Section: Single-electron Inp/gainp 2 Qdsmentioning

confidence: 99%

Section: Single-electron Inp/gainp 2 Qdsmentioning

confidence: 99%

Section: Magneto-pl Spectra: Experimentsmentioning

confidence: 99%

Section: Appendix A1 Structure Growthmentioning

confidence: 99%

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Fractional Charge States in the Magneto-Photoluminescence Spectra of Single-Electron InP/GaInP2 Quantum Dots

et al. 2021

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Nano-photoluminescence of natural anyon molecules and topological quantum computation

Mintairov

Lebedev

Vlasov

et al. 2021

Sci Rep

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The proposal of fault-tolerant quantum computations, which promise to dramatically improve the operation of quantum computers and to accelerate the development of the compact hardware for them, is based on topological quantum field theories, which rely on the existence in Nature of physical systems described by a Lagrangian containing a non-Abelian (NA) topological term. These are solid-state systems having two-dimensional electrons, which are coupled to magnetic-flux-quanta vortexes, forming complex particles, known as anyons. Topological quantum computing (TQC) operations thus represent a physical realization of the mathematical operations involving NA representations of a braid group Bn, generated by a set of n localized anyons, which can be braided and fused using a “tweezer” and controlled by a detector. For most of the potential TQC material systems known so far, which are 2D-electron–gas semiconductor structure at high magnetic field and a variety of hybrid superconductor/topological-material heterostructures, the realization of anyon localization versus tweezing and detecting meets serious obstacles, chief among which are the necessity of using current control, i.e., mobile particles, of the TQC operations and high density electron puddles (containing thousands of electrons) to generate a single vortex. Here we demonstrate a novel system, in which these obstacles can be overcome, and in which vortexes are generated by a single electron. This is a ~ 150 nm size many electron InP/GaInP2 self-organized quantum dot, in which molecules, consisting of a few localized anyons, are naturally formed and exist at zero external magnetic field. We used high-spatial-resolution scanning magneto-photoluminescence spectroscopy measurements of a set of the dots having five and six electrons, together with many-body quantum mechanical calculations to demonstrate spontaneous formation of the anyon magneto-electron particles (eν) having fractional charge ν = n/k, where n = 1–4 and k = 3–15 are the number of electrons and vortexes, respectively, arranged in molecular structures having a built-in (internal) magnetic field of 6–12 T. Using direct imaging of the molecular configurations we observed fusion and braiding of eν-anyons under photo-excitation and revealed the possibility of using charge sensing for their control. Our investigations show that InP/GaInP2 anyon-molecule QDs, which have intrinsic transformations of localized eν-anyons compatible with TQC operations and capable of being probed by charge sensing, are very promising for the realization of TQC.

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Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP2 Wigner molecule structures

Mintairov

Lebedev

Берт

et al. 2019

Applied Physics Letters

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Control of Wigner localization and electron cavity effects in near-field emission spectra of In(Ga)P/GaInP quantum-dot structures

Cited by 22 publications

References 32 publications

Fractional Charge States in the Magneto-Photoluminescence Spectra of Single-Electron InP/GaInP2 Quantum Dots

Fractional Charge States in the Magneto-Photoluminescence Spectra of Single-Electron InP/GaInP2 Quantum Dots

Nano-photoluminescence of natural anyon molecules and topological quantum computation

Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP2 Wigner molecule structures

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