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CCMP@UARK



List of Invited Talks by Group Members

 

- Invited presentation at the 2008 APS March Meeting; New Orleans, Louisiana, March 10-14, 2008;
``Properties of Ferroelectric Nanostructures,'' Inna Ponomareva, L. Bellaiche, I. Kornev, B.-K. Lai, I.I. Naumov, R. Resta and S. Prosandeev.

- Invited presentation at the 2008 SIAM Conference on Mathematical Aspects of Materials Science (MS08); Philadelphia, Pennsylvania, May 11-14, 2008;
``Computational modeling of multifunctional materials,'' I. Kornev, S. Lisenkov, R. Haumont, B. Dkhil and L. Bellaiche.

- Keynote presentation at the International Conference on Computational and Experimental Engineering and Sciences; Honolulu, Hawaii, March 16-22, 2008;
``Control of vortices by homogeneous fields in asymmetric dipolar systems,'' S. Prosandeev, I. Ponomareva, I. Kornev and L. Bellaiche.

- Presentation at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``Control of vortices by homogeneous fields in asymmetric ferroelectric and ferromagnetic rings: An unifying theoretical approach,'' S. Prosandeev, I. Ponomareva, I. Kornev and L. Bellaiche.

- Presentation at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``Properties of ferroelectrics, ferromagnetics, and multiferroics from atomistic simulations,'' L. Bellaiche, S. Bin-Omran, I. Kornev, S. Lisenkov, L. Louis, I. Ponomareva, S. Prosandeev, R. Haumont, G. Geneste, B. Dkhil, T. Ostapchuk, J. Hlinka and J. Petzelt.

- Presentation at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``High-frequency dielectric response of paraelectric BaTiO3,'' I. Ponomareva, L. Bellaiche, T. Ostapchuk, J. Hlinka and J. Petzelt.

- Presentation at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``Finite-temperature properties of multiferroic BiFeO3 from first principles,'' I. A. Kornev, S. Lisenkov, R. Haumont, B. Dkhil and L. Bellaiche.

- Invited presentation at the European School on Multiferroics; Grenoble, France; July 02-06, 2007;
 ``Effective Hamiltonian approaches,'' L. Bellaiche.
 
- Invited presentation at the 14th Semiconducting and Insulating Materials Conference (SIMC-XIV); Fayetteville, Arkansas; May 15-20, 2007;
 ``Unusual phenomena in ferroelectrics,'' L. Bellaiche, Huaxiang Fu, I. Kornev, Bo-Kuai Lai, Sergey Lisenkov, Ivan I. Naumov, I. Ponomareva, Sergey  Prosandeev and G.J. Salamo.

- Invited presentation at the International Symposium on Integrated Ferroelectrics (ISIF) 2007;  Bordeaux, France;  May 8-12, 2007;
   ``Unusual phenomena in ferroelectrics,'' L. Bellaiche, P. Bouvier, B. Dkhil, Huaxiang Fu, P.-E. Janolin, I. Kornev, J. Kreisel, Bo-Kuai Lai, Sergey Lisenkov,  Ivan I. Naumov, I. Ponomareva, Sergey Prosandeev, G.J. Salamo, and E. Suard. 

- Colloquium at Institute of Physics, Prague, Czech Republic, March 27 2007;
   ``Designing and understanding nanowonders from first-principles'', L. Bellaiche.

-  Invited presentation at the 2007 APS March Meeting; Denver, Colorado, March 5-9, 2007;
 ``Unusual phenomena in nanodots of ferroelectrics,''  S. Prosandeev, I. Ponomareva,  I. Kornev, I. Naumov and L. Bellaiche.

- Presentation at the 2007 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 11-14, 2007;
 ``Phase diagram of Pb(Zr,Ti)O3 solid solutions from first principles'', Igor A. Kornev, L. Bellaiche,  P.-E. Janolin, B. Dkhil and E. Suard.

- Presentation at the 2007 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 11-14, 2007;
 ``Novel depolarizing-field-induced phenomena in ferroelectric nanostructures'',  L. Bellaiche, I. Kornev, Bo-Kuai Lai, Sergey Lisenkov,  I. Ponomareva, Sergey Prosandeev, and  R. Resta.

- Presentation at the 2007 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 11-14, 2007;
``Ferroelectric Nanoscale Domain Structures computed by Finite Element'', D. Albrecht, D. Aubry,  L. Bellaiche and B. Dkhil.

- Presentation at the 2007 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 11-14, 2007;
 ``First-principles study of electric-field-induced domain evolution in  ferroelectric ultrathin films'',  Bo-Kuai Lai, I. Ponomareva, I. I. Kornev, L. Bellaiche and G. J. Salamo.

- Colloquium at ICMAB, Barcelona, Spain, January 18 2007;
 ``Designing and understanding nanowonders from first-principles'', L. Bellaiche.

- Colloquim at the  the Joint Institute for Nuclear Research in Dubna,  Russia, December 21-23, 2006;
   ``Toroidal moments in low-dimensional (nano) structures of ferroelectrics,'' S. Prosandeev, I. Ponomareva, I. Naumov,  I. Kornev,  and L. Bellaiche.

- Invited presentation at the 8th International Conference on Solid-State and Integrated-Circuit Technology, Shanghai (China), October 21-27, 2006;  
   ``Controlling the toroidal moment in ferroelectric dots'', S. Prosandeev, I. Ponomareva, I. Naumov, I. Kornev, and L.  Bellaiche.

- Invited presentation at the 18th International Symposium on Integrated Ferroelectrics (ISIF 2006), Honolulu, Hawaii, April 23-27, 2006;
 ``Phase Transitions and Ferroelectricity in Pb(ZrTi)O3 Nanodots and Nanowires'', Ivan Naumov, Laurent Bellaiche and H. Fu.

- Invited presentation at the INBRE conference; Fayetteville, Arkansas, February 25, 2006;
   ``Materials By Design'', Huaxiang Fu and L. Bellaiche.

- Invited presentation at the 2005 American Conference on Crystal Growth and Epitaxy; Big Sky Resort, Montana, July 10, 2005;
   ``Phase Transitions in ferroelectric Nanostructures'', given by Ivan I. Naumov.

- Invited presentation at the Japanese Physical Society meeting; Chiba, Japan, March 19, 2005;
   ``Study of complex ferroelectrics from first-principles'', given by L. Bellaiche.

- Colloquim at Waseda University; Tokyo, Japan, March 15, 2005;
   ``Building nanowonders from scratch'', given by L. Bellaiche.

- Invited presentation at the 42nd annual New Horizons in Science Briefing; Fayetteville (AR), November 07-10, 2004;
   ``Building the next nanowonders from scratch'', given by L. Bellaiche.

- Invited presentation at ACM midwest regional meeting; Manhattan, Kansas , October 20-22, 2004;
   ``Unusual phase transition in alloys of ScN/GaN and ScN/InN'', given by V. Ranjan.

- Invited presentation at the XIII International Materials Research Congress; Cancun (Mexico), August 23-24, 2004;
   ``Properties of Ferroelectric Nanostructures From First-Principles'', given by L. Bellaiche.

- Colloquium at Ecole Centrale; Paris (France), June 22, 2004;
   ``Properties of Ferroelectric Thin Films From First-Principles'', presented by L. Bellaiche.

- Invited presentation at the 3rd "International Conference on Computational Modeling and Simulation of Materials"; Acireale, Sicily (Italy), May 30-June 4, 2004;
   ``First-principles investigations of perovskite ferroelectric systems", presented by H. Fu.

- Invited presentation at the 2004 Workshop on Fundamental Physicsof Ferroelectrics; Williamsburg, Virginia, February, 8-11, 2004;
   ``Ferroelectric BaTiO3 Quantum Dots'', presented by H. Fu.

- Invited presentation at the 2004 Workshop on Fundamental Physicsof Ferroelectrics; Williamsburg, Virginia, February, 8-11, 2004;
    ``High pressure phases in highly piezoelectricPbZr0.52Ti0.48O3'', presented by I. Kornev.

- Invited presentation at the 2004 conference onMaterial technology and Design of Integrated Piezoelectric Devices; Courmayer (Italy), February 2-4, 2004;
    ``Understanding and design of insulating perovskites from first-principles'', presented by L. Bellaiche.

- Colloquium at Ecole Centrale; Paris (France), June 19, 2003;
   ``Finite-Temperature Properties of Ferroelectric Alloys From First Principles'' , presented by L. Bellaiche.

- Colloquium at the University of Arkansas (Chemistry department); Fayetteville (AR), March, 2003;
   ``Finite-Temperature Properties of Ferroelectric Alloys From First Principles'' , presented by L. Bellaiche.

- Invited presentation at the 2003 Workshop on FundamentalPhysics of Ferroelectrics; Williamsburg, VA, February 2-5 2003;
    ''Properties of Piezoelectric Materials from First Principles'' , presented by Laurent Bellaiche.

- Colloquium at the University of Arkansas, Fayetteville (AR),September 27, 2002;
    ``Finite temperature properties of ferroelectric alloys from first principles'', presented by Laurent Bellaiche.

- Invited presentation at the kickoff meeting on ONR Designof Piezoelectric Materials for Transducers Program; Washington D.C., May 9 2002;
    ``T-dependent and electrically induced phase transitionsfrom first-principles derived effective Hamiltonians,'', presented by Laurent Bellaiche.

- Invited presentation at the 2002 Workshop on FundamentalPhysics of Ferroelectrics; Washington D.C., February 3-6 2002;
    ``Electric-Field Induced Polarization Paths and ActiveOptical Phonons in Perovskite Alloys'', presented by Laurent Bellaiche.

- Invited presentation at the 2001 MRS Fall Meeting, Boston, November 26-30, 2001;
    ``Electronic and Optical anomalies in complex nitridealloys'', presented by Laurent Bellaiche.

- Invited presentation at the 2001 International Narrow Band-gapNitride Semiconductors Workshop; Singapore, October 7-11, 2001;
    `Optical and Electronic Properties of [Ga,In][As,N] Alloys'', presented by Ahmad Al-Yacoub.

- Invited presentation at the 2001 Workshop on Thermodynamicand Structural Properties of Materials; Avignon, France, September 9-14 2001;
    `Anomalous properties in ferroelectricsinduced by atomic ordering'', presented by Aaron George.

- Invited presentation at the 2001 March Meeting of the AmericanPhysical Society; Seattle (WA), March 12-16 2001;
    `Finite-Temperature Properties of Ferroelectric solid solutions From First-Principles'', presented by Laurent Bellaiche.

- Invited presentation at the 2001 Workshop on FundamentalPhysics of Ferroelectrics; Williamsburg (VA), February 4-7 2001;
   ``Composition modulation in Pb(Sc,Nb)O3 alloys'',  presented by Laurent Bellaiche.

- Invited presentation at the 2000 polarization effects onsemiconductors Workshop; Glacier National Park, Montana, August 27-31 2000;
    ``Anomalous optical properties in complexsemiconductor alloys '', presented by Ahmad Al-Yacoub.

- Invited presentation at the Twelfth Annual Workshop on RecentDevelopments in Electronic Structure Methods, Atlanta, Georgia , May 19-22, 2000;
   ``Finite-Temperature Properties of FerroelectricAlloys From First-Principles'', presented by Laurent Bellaiche.

- Invited presentation at the 1999 March Meeting of the AmericanPhysical Society; Atlanta (GA), March 20-26 1999;
   ``Structural Properties of Ferroelectric Alloys'',presented by Laurent Bellaiche.

- Invited presentation at the 1998 March Meeting of the American Physical Society; Los Angeles (CA), March 16-20 1998;
    ``Electronic Structure of Nitride Alloys'', presented by Laurent Bellaiche.





Some contributed presentations

- Presentation at the JMC 11; Strasbourg, France, August 25-29, 2008;
``Temperature phase dependence in thin films BiFeO3: a combined theoretical and experimental approach,'' B. Dupe, I. Ponomareva, L. Bellaiche, G. Geneste, M. Bibes, A. Barthelemy, and B. Dkhil.

- Presentation at the 2008 APS March Meeting; New Orleans, Louisiana, March 10-14, 2008;
``A new order parameter in complex dipolar structures,'' Sergey Prosandeev and L. Bellaiche.

- Presentation at the 2008 APS March Meeting; New Orleans, Louisiana, March 10-14, 2008;
``Dynamics of domains switching in epitaxial BaTiO3/SrTiO3 superlattices from first principles,'' Sergey Lisenkov, Inna Ponomareva and L. Bellaiche.

- Poster at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``Investigation of BaTiO3 nanowires and nanocomposites from first principles,'' L. Louis, I. Ponomareva, L. Bellaiche, G. Geneste and B. Dkhil.

- Poster at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``Domains switching in epitaxial BaTiO3/SrTiO3 superlattices from first principles,'' S. Lisenkov, I. Ponomareva and L. Bellaiche.

- Poster at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``Thickness-controlled structure of ferroelectric thin films,'' P.-E. Janolin, B.-K. Lai, Y. Yuzyuk L. Bellaiche and B. Dkhil.

- Poster at the 2008 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 10-13, 2008;
``Dependence of polarization on epitaxial strain in ferroelectric ultrathin films from first principles,'' S. Bin-Omran, I. Ponomareva and L. Bellaiche.

-Presentation at the EMF-2007, 11th European Meeting on Ferroelectricity; Bled, Slovenia; September 3-7, 2007; 
 ``Broad-Band Dielectric Spectroscopy of (Ba,Sr)TiO3 Ceramics,'' T. Ostapchik, J. Petzelt, S. Veljko, M. Savinov, F. Kadlec, A. Tkach, P. Vilarinho, A. Sotnikov, E. Smirnova, V.  Lemanov, I. Ponomareva and L. Bellaiche.

- Presentation at the EMF-2007, 11th European Meeting on Ferroelectricity; Bled, Slovenia; September 3-7, 2007; 
 ``Temperature and thickness evolution of ferroelectric thin films,'' P.E. Janolin, B.-K. Lai, I. Yuzuk, L. Bellaiche, Yu I. Golovko, V.M. Murkhortov, F. Le Marrec, M. El Marssi and B. Dkhil.

- Presentation at the EMF-2007, 11th European Meeting on Ferroelectricity; Bled, Slovenia; September 3-7, 2007; 
 ``Structure Analysis on Ferroelectric Nanowires,'' L. Louis, P. Gemeiner, W. Ma, N. Setter, I. Ponomareva, L. Bellaiche, G. Geneste and B. Dkhil.
 
- Presentation at the EMF-2007, 11th European Meeting on Ferroelectricity; Bled, Slovenia; September 3-7, 2007; 
 ``Ferroelectric Nanoscale Domain Structures computed by Finite Element,''  D.  Albrecht, D. Aubry,  L. Bellaiche and B. Dkhil.

- Presentation at the EMF-2007, 11th European Meeting on Ferroelectricity; Bled, Slovenia; September 3-7, 2007;  
 ``A new critical temperature in relaxor-based systems,''  B. Dkhil, P. Gemeiner, L. Bellaiche, E. Dul’kin and M. Roth.

- Presentation at the International Symposium on Integrated Ferroelectrics (ISIF) 2007; Bordeaux, France;  May 8-12, 2007;
``Ferroelectric nanowires : a combined experimental and theoretical  investigation,'' L. Louis, W. Ma, P. Gemeiner, B. Dkhil, G. Geneste, I. Ponomareva, L. Bellaiche, and N. Setter
 
- Presentation at the International Symposium on Integrated Ferroelectrics (ISIF) 2007; Bordeaux, France;  May 8-12, 2007;
 ``Ferroelectric thin films investigated by x-ray diffraction,'' P.-E. Janolin, L. Bellaiche,  B. Dkhil, M. El Marssi, Yu.I. Golovko, Bo-Kuai Lai, F. Le Marrec, V.M. Mukhortov, Yu. I. Yuzyuk.
 
- Presentation at the International Symposium on Integrated Ferroelectrics (ISIF) 2007;  Bordeaux, France;  May 8-12, 2007;
``A new temperature scale in relaxor-based systems,'' B. Dkhil, P. Gemeiner, L. Bellaiche, E. Dul’kin and M. Roth.
 
-  Presentation at the 2007 APS March Meeting; Denver, Colorado, March 5-9, 2007;
 ``Phase diagram of PZT solid solutions near the morphotropic phase boundary from first principles,''  Igor Kornev and L. Bellaiche

-  Presentation at the 2007 APS March Meeting; Denver, Colorado, March 5-9, 2007;
 ``Influence of the growth direction on properties of ferroelectric ultrathin films,'' Inna Ponomareva and L. Bellaiche.

- Poster at the 2007 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 11-14, 2007;
 ``Novel phenomena in ferroelectric nanodots'',  S. Prosandeev, I. Kornev and L. Bellaiche.

- Poster at the 2007 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 11-14, 2007;
``Finite-temperature properties of  epitaxial BaTiO3/SrTiO3 superlattices from first principles'',  Sergey Lisenkov and L. Bellaiche.

- Poster at the 2007 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 11-14, 2007;
 ``Properties of ferroelectric ultrathin films grown along [001], [110] and [111] directions'',  Inna Ponomareva and L. Bellaiche.

 -Presentation at the Fall 2006 MRS Meeting; Boston, MA, November  27--December 01, 2006; ``First-Principles Study of Domain Evolution in  Ferroelectric Ultrathin Films'', Bo-Kuai Lai, Inna Ponomareva, Ivan Naumov, Igor Kornev, Huaxiang Fu, Laurent Bellaiche and Greg Salamo.

- Presentation  at the XV International Materials Research Congress 2006; Cancun, Mexico, August, 20-26, 2006;
``Stress effect on ferroelectric materials',' Pierre-Eymeric Janolin, Brahim Dkhil, Jens Kresiel, Pierre Bouvier, Igor Kornev, and L.  Bellaiche.

- Presentation at the U.S. Navy Workshop on Acoustic Transduction  Materials and Devices, PennState, State College (USA), May, 08-11,  2006; Changing the chirality of dipolar vortices in ferroelectric nanodots'',  S. Prosandeev, I.Ponomareva,  I. Naumov, I. Kornev, and L. Bellaiche.

- Presentation at the 2006 APS March Meeting; Baltimore, Maryland,  March 13-17, 2006; ``Ferroelectricity of Perovskites under Pressure'',  Igor Kornev, L. Bellaiche, P. Bouvier, P.-E. Janolin, B. Dkhil and J. Kreisel.

- Presentation at the 2006 APS March Meeting; Baltimore, Maryland,  March 13-17, 2006; ``Ferrolectric nanodots and nanowires under different electrical and mechanical boundary conditions'', Inna Ponomareva, Ivan Naumov and  L. Bellaiche.

- Presentation at the 2006 APS March Meeting; Baltimore, Maryland,  March 13-17, 2006; ``Critical Behaviors in Pb(Zr,Ti)O3 Ultrathin films '', Emad Almahmoud, Igor Kornev and  L. Bellaiche.

- Presentation at the 2006 APS March Meeting; Baltimore, Maryland,  March 13-17, 2006;  ``Finite temperature properties of (Ba,Sr)TiO3 disordered  alloys and BaTiO3/SrTiO3 superlattices from first-principles '',               Sergey Lisenkov, Laura Walizer and L.  Bellaiche.

- Presentation at the 2006 APS March Meeting; Baltimore, Maryland,  March 13-17, 2006; ``Interaction between ferroelectric nanodots: a  first-principles-based study'', S. Prosandeev, I. Ponomareva,  I. Naumov, I. Kornev and L. Bellaiche

- Poster at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; "Critical Behaviors in Pb(Zr,Ti)O3 Ultrathin films", Emad Almahmoud, Igor Kornev and L. Bellaiche.

- Presentation at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; ``Controlling the toroidal moment in ferroelectric dots'', S. Prosandeev, I. Ponomareva, I. Naumov, I. Kornev, H. Fu and L. Bellaiche.

- Poster at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; ``Modeling finite temperature properties of (Ba,Sr)TiO3 disordered alloys and BaTiO3/SrTiO3 superlattices from first principles'', Sergey Lisenkov, Laura Walizer and L. Bellaiche.

- Presentation at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; ``Unusual phenomena in ferroelectrics'', L. Bellaiche, Huaxiang Fu, I. Kornev, Bo-Kuai Lai, Sergey Lisenkov, Ivan I. Naumov, I. Ponomareva, Sergey Prosandeev, and Laura Walizer.

- Presentation at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; ``Modeling of ferroelectric nanodots and nanowires under different electrical and mechanical boundary conditions'',
I. Ponomareva, Ivan I. Naumov, and L. Bellaiche.

- Poster at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; ``Domain evolution in ferroelectric ultrathin films under external electric field'', Bo-Kuai Lai, I. Ponomareva, I. I. Naumov, I. Kornev, Huaxiang Fu, L. Bellaiche and G. J. Salamo.

- Poster at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; ``Investigation of BaTiO3 nanowires from first principles'',
Lydie Louis, I. Ponomareva, I. Kornev, L. Bellaiche.

-Presentation at the 2006 Workshop on Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February, 12-15, 2006; ``Ferroelectricity of Perovskites under Pressures'',
Igor A. Kornev, L. Bellaiche, P. Bouvier, P.-E. Janolin, B. Dkhil and J. Kreisel.

-Contributed talk at MRS Fall Meeting; Boston, Masachusetts , November 29-December 3, 2004;
   ``Unusual phase transition in alloys of ScN/GaN and ScN/InN'', given by V. Ranjan.

- Contributed talk at the 2003 March Meeting of the American Physical Society; Austin, Texas, March 3-7, 2003;
    "Properties of ordered Sc_1-xGa_xN alloys from first-principles", presented by Ahmad Al-Yacoub.

- Contributed talk at the 2003 March Meeting of the American Physical Society; Austin, Texas, March 3-7, 2003;
    "Self-consistent tight-binding electronic structure of GaN/AlN pyrmidal quantum dots", presented by V. Ranjan.

- Contributed talk at the 2003 March Meeting of the American Physical Society; Austin, Texas, March 3-7, 2003;
   "Properties of hexagonal ScN from first-principles", presented by V. Ranjan.

- Poster presentation at the 2003 March Meeting of the American Physical Society; Austin, Texas, March 3-7, 2003;
    " Shallow-deep transitions of impurities in semiconductor nanostructures",  presented by V. Ranajan.

- Poster presentation at the 2003 Fundamental Physics of Ferroelectrics; Williamsburg, Virginia, February 2-5, 2003;
    "Properties of hexagonal ScN from first-principles", presented by V. Ranajan.

- Special Seminar at Department of Physics and Astronomy ofthe University of Oklahoma; Norman, Oklahoma, April 26 2002;
   ``Finite Temperature Properties of Complex Ferroelectrics, ''  presented by Igor Kornev.

- Contributed talk at the 2002 March Meeting of the AmericanPhysical Society; Indianapolis (IN), March 18-22 2002;
    `Finite-temperature Properties of PSN-PT From First-principles'', presented by Abdullah Al-Barakaty.

- Contributed talk at the 2002 March Meeting of the AmericanPhysical Society; Indianapolis (IN), March 18-22 2002;
    `First principlesstudy of a perovskite alloy half-made of vacancies:The case of (Ca1/2[]1/2)NbO3', presented by Horace Crogman.

- Contributed talk at the 2002 March Meeting of the AmericanPhysical Society; Indianapolis (IN), March 18-22 2002;
    `Optical phononsassociated with the low-temperature ferroelectric properties of perovskitesolid solutions', presented by Aaron George.

- Contributed talk at the 2002 March Meeting of the AmericanPhysical Society; Indianapolis (IN), March 18-22 2002;
 `Incommensurate Phases in Perovskites', presented by Igor Kornev.

- Contributed talk at the 2002 Workshop on Fundamental Physics of Ferroelectrics; Washington D.C., February 3-6 2002;
   ``Incommensurate phases in perovskites''  presentedby Igor Kornev.

- Contributed talk at the 2001 March Meeting of the AmericanPhysical Society; Seattle (WA), March 12-16 2001;
    ``Piezoelectric coefficients of (Ga,In)Nalloys'', presented by Ahmad Al-Yacoub. 

- Contributed talk at the 2001 March Meeting of the AmericanPhysical Society; Seattle (WA), March 12-16 2001;
    ``Composition Modulation in Pb(Sc,Nb)O3 alloys'', presented by Aaron George. 

- Contributed talk at the 2000 March Meeting of the American Physical Society; Minneapolis (MN), March 24 2000;
    ``Electronic and Optical anomalies in lattice-matched (Ga,In)(As,N) alloys'', presented by Ahmad Al-Yacoub