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Kubí,k, Petr,Š,ebek, Františ,ek,Petruš,ka, Jindř,ich,Hů,lka, Jiř,í,Park, Namsu,Huh, Hoon Elsevier 2018 Theoretical and applied fracture mechanics Vol.98 No.-
<P><B>Abstract</B></P> <P>This paper deals with a small punch test and ductile failure prediction of austenitic stainless steel 316L. Comprehensive investigation of fracture surfaces was conducted as well as examination of δ-ferrite and σ-phase present in the material in order to reveal the reason of occurrence of nonstandard type of fracture. Three phenomenological ductile fracture criteria were selected for comparative simulations regarding the prediction of crack initiation and propagation during the SPT. These criteria were calibrated by using the fracture tests of smooth cylindrical specimens, notched cylindrical specimens, notched tube specimens and cylinders with spherical recess. The whole material model including the fracture criteria with von Mises plasticity and element deletion technique for simulation of the crack initiation was implemented by using the user subroutine Vectorised User MATerial into the commercial finite element code of Abaqus. Finally, the simulation results with three ductile fracture criteria are compared and discussed based on the experimental results. Only one of the failure criteria captured the displacement at fracture correctly.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wide range of stress states is experimentally described for AISI 316L. </LI> <LI> Detailed study of fracture surfaces produced by penetration tests. </LI> <LI> Non-standard cracking is observed due to ferrite phase. </LI> <LI> Uncoupled ductile fracture criteria are calibrated for austenitic stainless steel. </LI> </UL> </P>
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Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide
Kirš,anskė,, Gabija,Thyrrestrup, Henri,Daveau, Raphaë,l S.,Dreeßen, Chris L.,Pregnolato, Tommaso,Midolo, Leonardo,Tighineanu, Petru,Javadi, Alisa,Stobbe, Søren,Schott, Rü,diger,Ludwi American Physical Society 2017 Physical review. B Vol.96 No.16
<P>We demonstrate a high-purity source of indistinguishable single photons using a quantum dot embedded in a nanophotonic waveguide. The source features a near-unity internal coupling efficiency and the collected photons are efficiently coupled off chip by implementing a taper that adiabatically couples the photons to an optical fiber. By quasiresonant excitation of the quantum dot, we measure a single-photon purity larger than 99.4% and a photon indistinguishability of up to 94 +/- 1% by using p-shell excitation combinedwith spectral filtering to reduce photon jitter. A temperature-dependent study allows pinpointing the residual decoherence processes, notably the effect of phonon broadening. Strict resonant excitation is implemented as well as another means of suppressing photon jitter, and the additional complexity of suppressing the excitation laser source is addressed. The paper opens a clear pathway towards the long-standing goal of a fully deterministic source of indistinguishable photons, which is integrated on a planar photonic chip.</P>
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