9 research outputs found
Tuning Resistive Switching On Single-pulse Doped Multilayer Memristors
Short-period multilayers containing ultrathin atomic layers of Al embedded in titanium dioxide (TiO2) film - here called single-pulse doped multilayers - are fabricated by atomic layer deposition (ALD) growth methods. The approach explored here is to use Al atoms through single-pulsed deposition to locally modify the chemical environment of TiO2 films, establishing a chemical control over the resistive switching properties of metal/oxide/metal devices. We show that this simple methodology can be employed to produce well-defined and controlled electrical characteristics on oxide thin films without compound segregation. The increase in volume of the embedded Al2O3 plays a crucial role in tuning the conductance of devices, as well as the switching bias. The stacking of these oxide compounds and their use in electrical devices is investigated with respect to possible crystalline phases and local compound formation via chemical recombination. It is shown that our method can be used to produce compounds that cannot be synthesized a priori by direct ALD growth procedures but are of interest due to specific properties such as thermal or chemical stability, electrical resistivity or electric field polarization possibilities. The monolayer doping discussed here impacts considerably on the broadening of the spectrum of performance and technological applications of ALD-based memristors, allowing for additional degrees of freedom in the engineering of oxide devices. © 2013 IOP Publishing Ltd.243Levi, B.G., (2007) Phys. Today, 60 (6), p. 23. , 10.1063/1.2754590 0031-9228Eckstein, J.N., Oxide interfaces: Watch out for the lack of oxygen (2007) Nature Materials, 6 (7), pp. 473-474. , DOI 10.1038/nmat1944, PII NMAT1944Smadici, S., Lee, J.C.T., Wang, S., Abbamonte, P., Logvenov, G., Gozar, A., Cavellin, C.D., Bozovic, I., (2009) Phys. Rev. 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Sketched Oxide Single-electron Transistor
Devices that confine and process single electrons represent an important scaling limit of electronics1,2. Such devices have been realized in a variety of materials and exhibit remarkable electronic, optical and spintronic properties3-5. Here, we use an atomic force microscope tip to reversibly 'sketch' single-electron transistors by controlling a metal-insulator transition at the interface of two oxides6-8. In these devices, single electrons tunnel resonantly between source and drain electrodes through a conducting oxide island with a diameter of ∼1.5 nm. We demonstrate control over the number of electrons on the island using bottom- and side-gate electrodes, and observe hysteresis in electron occupation that is attributed to ferroelectricity within the oxide heterostructure. These single-electron devices may find use as ultradense non-volatile memories, nanoscale hybrid piezoelectric and charge sensors, as well as building blocks in quantum information processing and simulation platforms.66343347Kastner, M.A., The single-electron transistor (1992) Rev. Mod. Phys., 64, pp. 849-858Hanson, R., Kouwenhoven, L.P., Petta, J.R., Tarucha, S., Vandersypen, L.M.K., Spins in few-electron quantum dots (2007) Reviews of Modern Physics, 79 (4), pp. 1217-1265. , http://oai.aps.org/oai?verb=GetRecord&Identifier=oai:aps.org: RevModPhys.79.1217&metadataPrefix=oai_apsmeta_2, DOI 10.1103/RevModPhys.79.1217Klein, D.L., Rotht, R., Lim, A.K.L., Alivisatosti, A.P., McEuen, P.L., A single-electron transistor made from a cadmium selenide nanocrystal (1997) Nature, 389 (6652), pp. 699-701. , DOI 10.1038/39535Kubatkin, S., Danilov, A., Hjort, M., Cornil, J., Bredas, J.-L., Stuhr-Hansen, N., Hedegard, P., Bjornholm, T., Single-electron transistor of a single organic molecule with access to several redox states (2003) Nature, 425 (6959), pp. 698-701. , DOI 10.1038/nature02010Stampfer, C., Tunable graphene single electron transistor (2008) Nano Lett., 8, pp. 2378-2383Ohtomo, A., Hwang, H.Y., A high-mobility electron gas at the LaAlO3/SrtiO3 heterointerface (2004) Nature, 427 (6973), pp. 423-426. , DOI 10.1038/nature02308Thiel, S., Hammerl, G., Schmehl, A., Schneider, C.W., Mannhart, J., Tunable quasi-two-dimensional electron gases in oxide heterostructures (2006) Science, 313 (5795), pp. 1942-1945. , DOI 10.1126/science.1131091Cen, C., Thiel, S., Hammerl, G., Schneider, C.W., Andersen, K.E., Hellberg, C.S., Mannhart, J., Levy, J., Nanoscale control of an interfacial metal-insulator transition at room temperature (2008) Nature Materials, 7 (4), pp. 298-302. , DOI 10.1038/nmat2136, PII NMAT2136Bi, F., Water-cycle mechanism for writing and erasing nanostructures at the LaAlO3/SrTiO3 interface (2010) Appl. 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Synthesis and antimicrobial studies of novel 2,4-diaryl-3-azabicyclo[3.3.1]nonan-9-one 4′-phenylthiosemicarbazones
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GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo during the Second Part of the Third Observing Run
The third Gravitational-Wave Transient Catalog (GWTC-3) describes signals detected with Advanced LIGO and Advanced Virgo up to the end of their third observing run. Updating the previous GWTC-2.1, we present candidate gravitational waves from compact binary coalescences during the second half of the third observing run (O3b) between 1 November 2019, 15∶00 Coordinated Universal Time (UTC) and 27 March 2020, 17∶00 UTC. There are 35 compact binary coalescence candidates identified by at least one of our search algorithms with a probability of astrophysical origin pastro>0.5. Of these, 18 were previously reported as low-latency public alerts, and 17 are reported here for the first time. Based upon estimates for the component masses, our O3b candidates with pastro>0.5 are consistent with gravitational-wave signals from binary black holes or neutron-star-black-hole binaries, and we identify none from binary neutron stars. However, from the gravitational-wave data alone, we are not able to measure matter effects that distinguish whether the binary components are neutron stars or black holes. The range of inferred component masses is similar to that found with previous catalogs, but the O3b candidates include the first confident observations of neutron-star-black-hole binaries. Including the 35 candidates from O3b in addition to those from GWTC-2.1, GWTC-3 contains 90 candidates found by our analysis with pastro>0.5 across the first three observing runs. These observations of compact binary coalescences present an unprecedented view of the properties of black holes and neutron stars. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Open access articleThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]