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Steger, Michael F.; Yang, A.; Sekiguchi, Toyokazu; Saeedi, K.; Thewalt, M. L. W.; Henry, M.O.; Johnston, K.; Alves, E.; Wahl, Ulrich; Riemann, H.; Abrosimov, Nikolai V.; Чурбанов, М. Ф.; Гусев, А. В.; Kaliteevskii, A. K.; Godisov, O. N.; Becker, Peter; Pohl, H.‐J.

doi:10.1103/physrevb.81.235217

Cited by 13 publications

(10 citation statements)

References 12 publications

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“…Indirect-gap semiconductors are more common, but their scintillation is slow and inefficient without doping. However, luminescence has been reported from Si [66,67] and Ge [68] at cryogenic temperatures (Table I suitable dopants to achieve high radiative efficiency. We show results for Ge and Si below since they are potential scintillators and are also used in current experiments sensitive to an ionization signal, like SuperCDMS and DAMIC.…”

Section: Scintillating Targetsmentioning

confidence: 99%

Direct detection of sub-GeV dark matter with scintillating targets

et al. 2017

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We describe a novel search for MeV-to-GeV-mass dark matter, in which the dark matter scatters off electrons in a scintillating target. The excitation and subsequent de-excitation of the electron produces one or more photons, which could be detected with an array of cryogenic low-noise photodetectors, such as transition edge sensors (TES) or microwave kinetic inductance devices (MKID). Scintillators may have distinct advantages over other experiments searching for a low ionization signal from sub-GeV DM. First, the detection of one or a few photons may be technologically easier. Second, since no electric field is required to detect the photons, there may be far fewer dark counts mimicking a DM signal. We discuss various target choices, but focus on calculating the expected dark matter-electron scattering rates in three scintillating crystals, sodium iodide (NaI), cesium iodide (CsI), and gallium arsenide (GaAs). Among these, GaAs has the lowest band gap (1.52 eV) compared to NaI (5.9 eV) or CsI (6.4 eV), allowing it to probe dark matter masses possibly as low as ∼ 0.5 MeV, compared to ∼ 1.5 MeV with NaI or CsI. We compare these scattering rates with those expected in silicon (Si) and germanium (Ge). The proposed experimental concept presents an important complementary path to existing efforts, and its potential advantages may make it the most sensitive direct-detection probe of DM down to MeV masses.

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Section: Scintillating Targetsmentioning

confidence: 99%

Direct detection of sub-GeV dark matter with scintillating targets

et al. 2017

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“…Stegner et al also identified an entire family of apparently similar PL centers including various combinations of Cu, Ag, Au, Li, and other metallic impurities, all of them containing "at least four," and in a few cases, "at least five," metallic impurities. 25,26 No defect containing two or three metallic impurities is visible in the PL spectra.…”

Section: Introductionmentioning

confidence: 99%

Four-copper complexes in Si and the Cu-photoluminescence defect: A first-principles study

2011

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Complexes containing four Cu impurities in Si are systematically investigated using density functional theory. The complexes include various combinations of substitutional and interstitial copper. The structures, formation and binding energies, approximate gap levels, and vibrational spectra are calculated and the results compared to the measured properties of the Cu PL defect. The best candidate out of those investigated is the Cu s1 Cu i3 complex recently proposed by Shirai et al. [J. Phys: Condens. Matter 21, 064249 (2009)]. The estimated positions of the gap levels of Cu s1 Cu in , with n = 0, . . . ,3, suggest a straightforward explanation as to why only the defects Cu s and Cu s1 Cu i3 occur in high-resistivity material.

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“…In addition, the decay to 197 Au and 197 Pt allowed for more multi-atom centres to be identified. These results are summarized in numerous papers [60,61] and have opened a considerable challenge to existing theory which remains open. Since this work, 28 Si has found a unique application in the field of quantum computing and is one of the most promising materials for the realization of next generation devices.…”

Section: Photoluminescence (Pl) Spectroscopymentioning

confidence: 99%

“…11 Be(t 1/2 =14 s); 27 Mg (9.5 min), 56 Mn (2.6 h) and 61 Co (1.6 h). A full description of the new chamber can be found in a recent review article [69].…”

Section: Emission Channellingmentioning

confidence: 99%

The solid state physics programme at ISOLDE: recent developments and perspectives

Johnston

Schell

Correia

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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Solid state physics (SSP) research at ISOLDE has been running since the mid-1970s and accounts for about 10%–15% of the overall physics programme. ISOLDE is the world flagship for the on-line production of exotic radioactive isotopes, with high yields, high elemental selectivity and isotopic purity. Consequently, it hosts a panoply of state-of-the-art nuclear techniques which apply nuclear methods to research on life sciences, material science and bio-chemical physics. The ease of detecting radioactivity—<1 ppm concentrations—is one of the features which distinguishes the use of radioisotopes for materials science research. The manner in which nuclear momenta of excited nuclear states interact with their local electronic and magnetic environment, or how charged emitted particles interact with the crystalline lattices allow the determination of the location, its action and the role of the selected impurity element at the nanoscopic state. ISOLDE offers an unrivalled range of available radioactive elements and this is attracting an increasing user community in the field of nuclear SSP research and brings together a community of materials scientists and specialists in nuclear solid state techniques. This article describes the current status of this programme along with recent illustrative results, predicting a bright future for these unique research methods and collaborations.

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Isotopic fingerprints of Pt-containing luminescence centers in highly enrichedS28i

Cited by 13 publications

References 12 publications

Direct detection of sub-GeV dark matter with scintillating targets

Direct detection of sub-GeV dark matter with scintillating targets

Four-copper complexes in Si and the Cu-photoluminescence defect: A first-principles study

The solid state physics programme at ISOLDE: recent developments and perspectives

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