2015
DOI: 10.1103/physrevb.91.205316
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Germanium-based quantum emitters towards a time-reordering entanglement scheme with degenerate exciton and biexciton states

Abstract: We address the radiative emission of individual germanium extrinsic centers in Al0.3Ga0.7As epilayers grown on germanium substrates. Micro-photoluminescence experiments demonstrate the capability of high temperature emission (70 K) and complex exciton configurations (neutral exciton X and biexciton XX, positive X + and negative X − charged exciton) of these quantum emitters. Finally, we investigate the renormalization of each energy level showing a large and systematic change of the binding energy of XX and X … Show more

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Cited by 19 publications
(17 citation statements)
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References 119 publications
(238 reference statements)
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“…Moreover, we can also exclude that the observed bands originate from Au plasmon resonance: this resonance is expected at about 2.15 eV for Au films [15,16], at lower energies with respect to the PL emissions of our sample (> 2.3 eV), and indeed a small broad band was observed at about 2.2 eV in our PL near field spectra (not shown). The linear dependence of the spectrally integrated PL intensity of each band on the excitation intensity (not shown) indicates that the radiative recombination arises from excitons [17] in agreement with previous reports [18,19]. The comparison reported in Fig.…”
Section: Resultssupporting
confidence: 91%
“…Moreover, we can also exclude that the observed bands originate from Au plasmon resonance: this resonance is expected at about 2.15 eV for Au films [15,16], at lower energies with respect to the PL emissions of our sample (> 2.3 eV), and indeed a small broad band was observed at about 2.2 eV in our PL near field spectra (not shown). The linear dependence of the spectrally integrated PL intensity of each band on the excitation intensity (not shown) indicates that the radiative recombination arises from excitons [17] in agreement with previous reports [18,19]. The comparison reported in Fig.…”
Section: Resultssupporting
confidence: 91%
“…The fitting parameters result to be α = (1.01 ± 0.14) µW −β and β = (1.14 ± 0.06) complex. It turns out that X is nearly always broader than XX 64 , as we also found in our case.…”
supporting
confidence: 88%
“…An important feature of QDs is their capability to generate, at low temperature, polarizationentangled photon pairs by using the cascade decay of a biexciton state | ⟩ XX to the crystal ground state | ⟩ 0 through the intermediate bright exciton | ⟩ X states 12 . This makes QDs different from other quantum emitters, such as organic molecules, carbon nanotubes 133 and colour centres (even if dyads can support biexcitons 134 no direct demonstration of entanglement has been so far reported). Another widespread solid-state route to entangled photons are the nonlinear parametric down-converters (PDC) 135 , which are intrinsically based on laser pumping with Poissonian (non-deterministic) photon statistics, even in the limit of low pumping.…”
Section: Elsevier (C)mentioning
confidence: 99%