SPECTRAL CHARACTERISTICS OF MID-INFRARED LIGHT-EMITTING DIODES BASED ON InAs (Sb,P)

Subject of Study. We consider spectral characteristics of mid-infrared light-emitting diodes with heterostructures based on InAs(Sb,P) emitting at T=300 K in the wavelength range 3.4–4.1 micrometers. The aim of the study was to search for the ways of increasing the diode efficiency. Methods. The heterostructures were grown from metal-organic chemical compounds with the use of vapor-phase epitaxial technique. The spectra were recorded under pulse excitation with the use of computer-controlled installation employing MDR-23 grating monochromator and a lock-in amplifier. InSb photodiode was used as a detector. Comparative study of electroluminescence spectra of the diodes was carried out at the temperatures equal to 300 K and 77 K. We compared the obtained data with the calculation results of the band diagrams of the heterostructures. Main Results. As a result of comparative study of the electroluminescence spectra of the diodes recorded at 300 K and 77 K we have established that increasing of their efficiency is hindered by substantial influence of Auger recombination. For the first time at 77 К we have observed the effect of stimulated emission from InAsSb active layer in light-emitting structures made of InAs/InAsSb/InAsSbP. For heterostructures with quantum wells InAs/(InAs/InAsSb)/InAsSbP we have found out that at 77 К the carrier recombination occurs outside quantum wells, which points out to the insufficient carrier localization in the active layer. Thus, we have shown that the efficiency of mid-infrared light-emitting diodes based on InAs(Sb,P) can be increased via suppression of Auger-recombination and improvement of carrier localization in the active region. Practical Relevance. The results of the study can be used for development of heterostructures for mid-infrared light-emitting diodes

Search for scalar quarks in Z0 decays

A search has been made for pairs of scalar quarks (squarks) produced in e+e- annihilations at LEP (√s≃MZ0), and decaying into a standard quark and a neutral, non-interacting, stable, massive particle (the lightest supersymmetric particle, LSP). The search has been conducted for differences in the mass of the squark and LSP of 2 GeV/c2 and above. Up squarks with masses below 42 GeV/c2 and down squarks below 43 GeV/c2 were excluded. Six squark flavours degenerate in mass were excluded below 45 GeV/c2.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A Comparison of jet production rates on the Z0 resonance to perturbative QCD

The production rates for 2-, 3-, 4- and 5-jet hadronic final states have been measured with the DELPHI detector at the e+e- storage ring LEP at centre of mass energies around 91.5 GeV. Fully corrected data are compared to O(αs 2) QCD matrix element calculations and the QCD scale parameter ΛMS is determined for different parametrizations of the renormalization scale μ2. Including all uncertainties our result is αs(MZ 2)=0.114±0.003[stat.]±0.004[syst.]±0.012[theor.] .0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A Search for sleptons and gauginos in Z0 decays

Using a data sample corresponding to 10 000 hadronic Z0 decays, we have searched for the production of sleptons and gauginos in the two-prong decays of Z0. No candidate remains after straightforward selections. For neutralinos, we use selection methods developed in our previous search for neutral Higgs particles. The negative results are translated into improved mass limits and parameter constraints on the minimal supersymmetric extension of the standard model

SEARCH FOR HEAVY CHARGED SCALARS IN Z0 DECAYS

Using a sample of Z0's corresponding to about 12 000 events, we have searched for the production of charged scalars, primarily charged Higgs particles, decaying into c̄scs̄, τν+jets, and τντν. The average detection efficiency is 20%. No candidate was found in the leptonic modes. Masses in the range up to 30-36 GeV/c2 are excluded, extending the mass domain covered by previous e+e- machines.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Search for pair production of neutral Higgs bosons in Z0^0 decays

none486P. Abreu;W. Adam;F. Adami;T. Adye;G.D. Alekseev;J.V. Allaby;P. Allen;S. Almehed;F. Alted;S.J. Alvsvaag;U. Amaldi;E. Anassontzis;W.D. Apel;B. Asman;C. Astor Ferreres;J.E. Augustin;A. Augustinus;P. Baillon;P. Bambade;F. Barao;G. Barbiellini;D.Yu. Bardin;A. Baroncelli;O. Barring;W. Bartl;M.J. Bates;M. Baubillier;K.H. Becks;C.J. Beeston;P. Beilliere;I. Belokopytov;P. Beltran;D. Benedic;J.M. Benlloch;M. Berggren;D. Bertrand;S. Biagi;F. Bianchi;J.H. Bibby;M.S. Bilenky;P. Billoir;J. Bjarne;D. Bloch;P.N. Bogolubov;D. Bollini;T. Bolognese;M. Bonapart;P.S.L. Booth;M. Boratav;P. Borgeaud;H. Borner;C. Bosio;O. Botner;B. Bouquet;M. Bozzo;S. Braibant;P. Branchini;K.D. Brand;R.A. Brenner;C. Bricman;R.C.A. Brown;N. Brummer;J.M. Brunet;L. Bugge;T. Buran;H. Burmeister;C.M. Buttar;J.A.M.A. Buytaert;M. Caccia;M. Calvi;A.J. Camacho Rozas;J.E. Campagne;A. Campion;T. Camporesi;V. Canale;F. Cao;L. Carroll;C. Caso;E. Castelli;M.V. Castillo Gimenez;A. Cattai;F.R. Cavallo;L. Cerrito;P. Charpentier;P. Checchia;G.A. Chelkov;L. Chevalier;P.V. Chliapnikov;V. Chorowicz;R. Cirio;M.P. Clara;J.L. Contreras;R. Contri;G. Cosme;F. Couchot;H.B. Crawley;D. Crennell;M. Cresti;G. Crosetti;N. Crosland;M. Crozon;J. Cuevas Maestro;S. Czellar;S. Dagoret;E. Dahl-Jensen;B. D'Almagne;M. Dam;G. Damgaard;G. Darbo;E. Daubie;M. Davenport;P. David;A. De Angelis;M. De Beer;H. De Boeck;W. De Boer;C. De Clercq;M.D.M. De Fez Laso;N. De Groot;C. De La Vaissiere;B. De Lotto;C. Defoix;D. Delikaris;P. Delpierre;N. Demaria;A. De Min;L. Di Ciaccio;A.N. Diddens;H. Dijkstra;F. Djama;J. Dolbeau;K. Doroba;M. Dracos;J. Drees;M. Dris;W. Dulinski;R. Dzhelyadin;D.N. Edwards;L.O. Eek;P.A.M. Eerola;T. Ekelof;G. Ekspong;J.P. Engel;V. Falaleev;A. Fenyuk;M. Fernandez Alonso;A. Ferrer;S. Ferroni;T.A. Filippas;A. Firestone;H. Foeth;E. Fokitis;F. Fontanelli;H. Forsbach;B. Franek;K.E. Fransson;P. Frenkiel;D.C. Fries;R. Fruhwirth;F. Fulda-Quenzer;H. Fuerstenau;J. Fuster;J.M. Gago;G. Galeazzi;D. Gamba;U. Gasparini;P. Gavillet;S. Gawne;E.N. Gazis;P. Giacomelli;K.W. Glitza;R. Gokieli;V.M. Golovatyuk;A. Goobar;G. Gopal;M. Gorski;V. Gracco;A. Grant;F. Grard;E. Graziani;M.H. Gros;G. Grosdidier;B. Grossetete;S. Gumenyuk;J. Guy;F. Hahn;M. Hahn;S. Haider;Z. Hajduk;A. Hakansson;A. Hallgren;K. Hamacher;G. Hamel De Monchenault;J.F. Harris;B. Heck;I. Herbst;J.J. Hernandez;P. Herquet;H. Herr;E. Higon;H.J. Hilke;T. Hofmokl;R. Holmes;S.O. Holmgren;J.E. Hooper;M. Houlden;J. Hrubec;P.O. Hulth;K. Hultqvist;D. Husson;B.D. Hyams;P. Ioannou;P.S. Iversen;J.N. Jackson;P. Jalocha;G. Jarlskog;P. Jarry;B. Jean-Marie;E.K. Johansson;M. Jonker;L. Jonsson;P. Juillot;R.B. Kadyrov;G. Kalkanis;G. Kalmus;G. Kantardjian;F. Kapusta;P. Kapusta;S. Katsanevas;E.C. Katsoufis;R. Keranen;J. Kesteman;B.A. Khomenko;B. King;N.J. Kjaer;H. Klein;W. Klempt;A. Klovning;P. Kluit;J.H. Koehne;B. Koene;P. Kokkinias;M. Kopf;M. Koratzinos;K. Korcyl;A.V. Korytov;B. Korzen;C. Kourkoumelis;T. Kreuzberger;J. Krolikowski;U. Kruener-Marquis;W. Krupinski;W. Kucewicz;K. Kurvinen;M.I. Laakso;C. Lambropoulos;J.W. Lamsa;L. Lanceri;V. Lapin;J.P. Laugier;R. Lauhakangas;P. Laurikainen;G. Leder;F. Ledroit;J. Lemonne;G. Lenzen;V. Lepeltier;A. Letessier-Selvon;E. Lieb;E. Lillestol;E. Lillethun;J. Lindgren;I. Lippi;R. Llosa;B. Loerstad;M. Lokajicek;J.G. Loken;A. Lopez;M.A. Lopez Aguera;D. Loukas;J.J. Lozano;R. Lucock;B. Lund-Jensen;P. Lutz;L. Lyons;G. Maehlum;J. Maillard;A. Maltezos;F. Mandl;J. Marco;J.C. Marin;A. Markou;L. Mathis;C. Matteuzzi;G. Matthiae;M. Mazzucato;M. Mc Cubbin;R. Mc Kay;E. Menichetti;C. Meroni;W.T. Meyer;W.A. Mitaroff;G.V. Mitselmakher;U. Mjoernmark;T. Moa;R. Moeller;K. Moenig;M.R. Monge;P. Morettini;H. Mueller;H. Muller;G. Myatt;F. Naraghi;U. Nau-Korzen;F.L. Navarria;P. Negri;B.S. Nielsen;M. Nigro;V. Nikolaenko;V. Obraztsov;R. Orava;A. Ouraou;R. Pain;K. Pakonski;H. Palka;T. Papadopoulou;L. Pape;P. Pasini;A. Passeri;M. Pegoraro;V. Perevozchikov;M. Pernicka;M. Pimenta;O. Pingot;C. Pinori;A. Pinsent;M.E. Pol;B. Poliakov;G. Polok;P. Poropat;P. Privitera;A. Pullia;J. Pyyhtia;A.A. Rademakers;D. Radojicic;S. Ragazzi;W.H. Range;P.N. Ratoff;A.L. Read;N.G. Redaelli;M. Regler;D. Reid;P.B. Renton;L.K. Resvanis;F. Richard;J. Ridky;G. Rinaudo;I. Roditi;A. Romero;P. Ronchese;E. Rosenberg;U. Rossi;E. Rosso;P. Roudeau;T. Rovelli;V. Ruhlmann;A. Ruiz;H. Saarikko;Y. Sacquin;E. Sanchez;J. Sanchez;E. Sanchis;M. Sannino;M. Schaeffer;H. Schneider;F. Scuri;A. Sebastia;A.M. Segar;R. Sekulin;M. Sessa;G. Sette;R. Seufert;R.C. Shellard;P. Siegrist;S. Simonetti;F. Simonetto;A.N. Sissakian;T.B. Skaali;J. Skeens;G. Skjevling;G. Smadja;G.R. Smith;R. Sosnowski;K. Spang;T. Spassoff;E. Spiriti;S. Squarcia;H. Staeck;C. Stanescu;G. Stavropoulos;F. Stichelbaut;A. Stocchi;J. Strauss;R. Strub;C. Stubenrauch;M. Szczekowski;M. Szeptycka;P. Szymanski;S. Tavernier;E. Tchernyaev;G. Theodosiou;A. Tilquin;J. Timmermans;V.G. Timofeev;L.G. Tkatchev;D.Z. Toet;A.K. Topphol;L. Tortora;D. Treille;U. Trevisan;G. Tristram;C. Troncon;E.N. Tsyganov;M. Turala;R. Turchetta;M.L. Turluer;T. Tuuva;I.A. Tyapkin;M. Tyndel;S. Tzamarias;F. Udo;S. Ueberschaer;V.A. Uvarov;G. Valenti;E. Vallazza;J.A. Valls;G.W. Van Apeldoorn;P. Van Dam;W.K. Van Doninck;N. Van Eijndhoven;C. Vander Velde;J. Varela;P. Vaz;G. Vegni;M.E. Veitch;J. Velasco;L. Ventura;W. Venus;F. Verbeure;L.S. Vertogradov;L. Vibert;D. Vilanova;N.K. Vishnevskiy;E.V. Vlasov;A.S. Vodopianov;M. Vollmer;G. Voulgaris;M. Voutilainen;V. Vrba;H. Wahlen;C. Walck;F. Waldner;M. Wayne;P. Weilhammer;J. Werner;A.M. Wetherell;J.H. Wickens;J. Wikne;W.S.C. Williams;M. Winter;D. Wormald;G. Wormser;K. Woschnagg;N. Yamdagni;P. Yepes;A. Zaitsev;A. Zalewska;P. Zalewski;P.I. Zarubin;E. Zevgolatakos;G. Zhang;N.I. Zimin;R. Zitoun;R. Zukanovich Funchal;G. Zumerle;J. ZunigaP., Abreu; W., Adam; F., Adami; T., Adye; G. D., Alekseev; J. V., Allaby; P., Allen; S., Almehed; F., Alted; S. J., Alvsvaag; U., Amaldi; E., Anassontzis; W. D., Apel; B., Asman; C., Astor Ferreres; J. E., Augustin; A., Augustinus; P., Baillon; P., Bambade; F., Barao; G., Barbiellini; Bardin, D. Y. u.; A., Baroncelli; O., Barring; W., Bartl; M. J., Bates; M., Baubillier; K. H., Becks; C. J., Beeston; P., Beilliere; I., Belokopytov; P., Beltran; D., Benedic; J. M., Benlloch; M., Berggren; D., Bertrand; S., Biagi; F., Bianchi; J. H., Bibby; M. S., Bilenky; P., Billoir; J., Bjarne; D., Bloch; P. N., Bogolubov; D., Bollini; T., Bolognese; M., Bonapart; P. S. L., Booth; M., Boratav; P., Borgeaud; H., Borner; C., Bosio; O., Botner; B., Bouquet; Bozzo, Marco; S., Braibant; P., Branchini; K. D., Brand; R. A., Brenner; C., Bricman; R. C. A., Brown; N., Brummer; J. M., Brunet; L., Bugge; T., Buran; H., Burmeister; C. M., Buttar; J. A. M. A., Buytaert; M., Caccia; M., Calvi; A. J., Camacho Rozas; J. E., Campagne; A., Campion; T., Camporesi; V., Canale; F., Cao; L., Carroll; Caso, Carlo; E., Castelli; M. V., Castillo Gimenez; A., Cattai; F. R., Cavallo; L., Cerrito; P., Charpentier; P., Checchia; G. A., Chelkov; L., Chevalier; P. V., Chliapnikov; V., Chorowicz; R., Cirio; M. P., Clara; J. L., Contreras; Contri, Roberto; G., Cosme; F., Couchot; H. B., Crawley; D., Crennell; M., Cresti; G., Crosetti; N., Crosland; M., Crozon; J., Cuevas Maestro; S., Czellar; S., Dagoret; E., Dahl Jensen; B., D'Almagne; M., Dam; G., Damgaard; G., Darbo; E., Daubie; M., Davenport; P., David; A., De Angelis; M., De Beer; H., De Boeck; W., De Boer; C., De Clercq; M. D. M., De Fez Laso; N., De Groot; C., De La Vaissiere; B., De Lotto; C., Defoix; D., Delikaris; P., Delpierre; N., Demaria; A., De Min; L., Di Ciaccio; A. N., Diddens; H., Dijkstra; F., Djama; J., Dolbeau; K., Doroba; M., Dracos; J., Drees; M., Dris; W., Dulinski; R., Dzhelyadin; D. N., Edwards; L. O., Eek; P. A. M., Eerola; T., Ekelof; G., Ekspong; J. P., Engel; V., Falaleev; A., Fenyuk; M., Fernandez Alonso; A., Ferrer; Ferroni, Sergio; T. A., Filippas; A., Firestone; H., Foeth; E., Fokitis; Fontanelli, Flavio; H., Forsbach; B., Franek; K. E., Fransson; P., Frenkiel; D. C., Fries; R., Fruhwirth; F., Fulda Quenzer; H., Fuerstenau; J., Fuster; J. M., Gago; G., Galeazzi; D., Gamba; U., Gasparini; P., Gavillet; S., Gawne; E. N., Gazis; P., Giacomelli; K. W., Glitza; R., Gokieli; V. M., Golovatyuk; A., Goobar; G., Gopal; M., Gorski; Gracco, Valerio; A., Grant; F., Grard; E., Graziani; M. H., Gros; G., Grosdidier; B., Grossetete; S., Gumenyuk; J., Guy; F., Hahn; M., Hahn; S., Haider; Z., Hajduk; A., Hakansson; A., Hallgren; K., Hamacher; G., Hamel De Monchenault; J. F., Harris; B., Heck; I., Herbst; J. J., Hernandez; P., Herquet; H., Herr; E., Higon; H. J., Hilke; T., Hofmokl; R., Holmes; S. O., Holmgren; J. E., Hooper; M., Houlden; J., Hrubec; P. O., Hulth; K., Hultqvist; D., Husson; B. D., Hyams; P., Ioannou; P. S., Iversen; J. N., Jackson; P., Jalocha; G., Jarlskog; P., Jarry; B., Jean Marie; E. K., Johansson; M., Jonker; L., Jonsson; P., Juillot; R. B., Kadyrov; G., Kalkanis; G., Kalmus; G., Kantardjian; F., Kapusta; P., Kapusta; S., Katsanevas; E. C., Katsoufis; R., Keranen; J., Kesteman; B. A., Khomenko; B., King; N. J., Kjaer; H., Klein; W., Klempt; A., Klovning; P., Kluit; J. H., Koehne; B., Koene; P., Kokkinias; M., Kopf; M., Koratzinos; K., Korcyl; A. V., Korytov; B., Korzen; C., Kourkoumelis; T., Kreuzberger; J., Krolikowski; U., Kruener Marquis; W., Krupinski; W., Kucewicz; K., Kurvinen; M. I., Laakso; C., Lambropoulos; J. W., Lamsa; L., Lanceri; V., Lapin; J. P., Laugier; R., Lauhakangas; P., Laurikainen; G., Leder; F., Ledroit; J., Lemonne; G., Lenzen; V., Lepeltier; A., Letessier Selvon; E., Lieb; E., Lillestol; E., Lillethun; J., Lindgren; I., Lippi; R., Llosa; B., Loerstad; M., Lokajicek; J. G., Loken; A., Lopez; M. A., Lopez Aguera; D., Loukas; J. J., Lozano; R., Lucock; B., Lund Jensen; P., Lutz; L., Lyons; G., Maehlum; J., Maillard; A., Maltezos; F., Mandl; J., Marco; J. C., Marin; A., Markou; L., Mathis; C., Matteuzzi; G., Matthiae; M., Mazzucato; M., Mc Cubbin; R., Mc Kay; E., Menichetti; C., Meroni; W. T., Meyer; W. A., Mitaroff; G. V., Mitselmakher; U., Mjoernmark; T., Moa; R., Moeller; K., Moenig; Monge, MARIA ROBERTA; P., Morettini; H., Mueller; H., Muller; G., Myatt; F., Naraghi; U., Nau Korzen; F. L., Navarria; P., Negri; B. S., Nielsen; M., Nigro; V., Nikolaenko; V., Obraztsov; R., Orava; A., Ouraou; R., Pain; K., Pakonski; H., Palka; T., Papadopoulou; L., Pape; P., Pasini; A., Passeri; M., Pegoraro; V., Perevozchikov; M., Pernicka; M., Pimenta; O., Pingot; C., Pinori; A., Pinsent; M. E., Pol; B., Poliakov; G., Polok; P., Poropat; P., Privitera; A., Pullia; J., Pyyhtia; A. A., Rademakers; D., Radojicic; S., Ragazzi; W. H., Range; P. N., Ratoff; A. L., Read; N. G., Redaelli; M., Regler; D., Reid; P. B., Renton; L. K., Resvanis; F., Richard; J., Ridky; G., Rinaudo; I., Roditi; A., Romero; P., Ronchese; E., Rosenberg; U., Rossi; E., Rosso; P., Roudeau; T., Rovelli; V., Ruhlmann; A., Ruiz; H., Saarikko; Y., Sacquin; E., Sanchez; J., Sanchez; E., Sanchis; Sannino, Mario; M., Schaeffer; H., Schneider; F., Scuri; A., Sebastia; A. M., Segar; R., Sekulin; M., Sessa; Sette, Giuseppe; R., Seufert; R. C., Shellard; P., Siegrist; S., Simonetti; F., Simonetto; A. N., Sissakian; T. B., Skaali; J., Skeens; G., Skjevling; G., Smadja; G. R., Smith; R., Sosnowski; K., Spang; T., Spassoff; E., Spiriti; Squarcia, Sandro; H., Staeck; C., Stanescu; G., Stavropoulos; F., Stichelbaut; A., Stocchi; J., Strauss; R., Strub; C., Stubenrauch; M., Szczekowski; M., Szeptycka; P., Szymanski; S., Tavernier; E., Tchernyaev; G., Theodosiou; A., Tilquin; J., Timmermans; V. G., Timofeev; L. G., Tkatchev; D. Z., Toet; A. K., Topphol; L., Tortora; D., Treille; Trevisan, Umberto; G., Tristram; C., Troncon; E. N., Tsyganov; M., Turala; R., Turchetta; M. L., Turluer; T., Tuuva; I. A., Tyapkin; M., Tyndel; S., Tzamarias; F., Udo; S., Ueberschaer; V. A., Uvarov; G., Valenti; E., Vallazza; J. A., Valls; G. W., Van Apeldoorn; P., Van Dam; W. K., Van Doninck; N., Van Eijndhoven; C., Vander Velde; J., Varela; P., Vaz; G., Vegni; M. E., Veitch; J., Velasco; L., Ventura; W., Venus; F., Verbeure; L. S., Vertogradov; L., Vibert; D., Vilanova; N. K., Vishnevskiy; E. V., Vlasov; A. S., Vodopianov; M., Vollmer; G., Voulgaris; M., Voutilainen; V., Vrba; H., Wahlen; C., Walck; F., Waldner; M., Wayne; P., Weilhammer; J., Werner; A. M., Wetherell; J. H., Wickens; J., Wikne; W. S. C., Williams; M., Winter; D., Wormald; G., Wormser; K., Woschnagg; N., Yamdagni; P., Yepes; A., Zaitsev; A., Zalewska; P., Zalewski; P. I., Zarubin; E., Zevgolatakos; G., Zhang; N. I., Zimin; R., Zitoun; R., Zukanovich Funchal; G., Zumerle; J., Zunig