University of Connecticut | |
Faculty
Rampi Ramprasad
Recent Publications [ 43 ] K. Zhou, S. A. Boggs, R. Ramprasad, M. Aindow, C. Erkey and S. P. Alpay, "Dielectric response and tunability of a dielectric-paraeletric composite", Appl. Phys. Lett. 93, 102908 (2008). [ 42 ] C. Tang and R. Ramprasad, "Oxygen defect accumulation at Si:HfO2 interfaces ", Appl. Phys. Lett. 92, 182908 (2008). [ 41 ] C. Tang and R. Ramprasad, "A study of Hf vacancies at Si:HfO2 heterojunctions", Appl. Phys. Lett. 92, 152911 (2008). [ 40 ] N. Shi and R. Ramprasad, "Local properties at interfaces in nanodielectrics: An ab initio computational study", IEEE Trans. Dielectrics and Electrical Insulation, 15, 170 (2008). [ 39 ] N. Shi and R. Ramprasad, "Local dielectric permittivity of HfO2 based slabs and stacks: A first principles study", Appl. Phys. Lett. 91, 242906 (2007). [ 38 ] S. Agarwal, M. S. Raghuveer, R. Ramprasad, and G. Ramanath, "Multishell carrier transport in multiwalled carbon nanotube thin films", IEEE Transactions on Nanotechnology 6, 722 (2007). [ 37 ] J. Ho, R. Ramprasad, and S. Boggs, "Effect of UV treatment on the dielectric strength of BOPP films", IEEE Transactions on Dielectrics and Electrical Insulation 14, 1295 (2007). [ 36 ] T. Sadowski and R. Ramprasad, "Stability and electronic structure of CdSe nanorods from first principles", Phys. Rev. B 76, 235310 (2007). [ 35 ] C. Tang, B. R. Tuttle and R. Ramprasad, "Diffusion of O vacancies near Si:HfO2 interfaces: an ab initio investigation", Phys. Rev. B 76, 073306 (2007). [ 34 ] C. Tang and R. Ramprasad, "Oxygen pressure dependence of HfO2 stoichiometry: An ab initio investigation", Appl. Phys. Lett. 91, 022904 (2007). [ 33 ] B. R. Tuttle, C. Tang and R. Ramprasad, "First-principles study of the valence band offset between silicon and hafnia", Phys. Rev. B 75, 235324 (2007). [ 32 ] C. Tang and R. Ramprasad, "Ab initio study of O interstitial diffusion near Si:HfO2 interfaces", Phys. Rev. B 75, 241302(R) (2007). [ 31 ] N. Shi and R. Ramprasad, "The intrinsic dielectric properties of phthalocyanine crystals: An ab initio investigation", Phys. Rev. B, 75, 155429 (2007). [ 30 ] N. Shi and R. Ramprasad, "Dielectric propertis of nanoscale multi-component system: A first principles computational study", J. Computer-Aided Materials Design, 14, 133 (2007). [ 29 ] M. Yu, G. Fernando, R. Li, F. Papadimitrakopoulos, N. Shi and R. Ramprasad, "Discrete size series of CdSe quantum dots: A combined computational and experimental investigation", J. Computer-Aided Materials Design, 14, 167 (2007). [ 28 ] N. Shi and R. Ramprasad, "Dielectric properties of Cu-phthalocyanine systems from first principles", Appl. Phys. Lett., 89, 102904 (2006). [ 27 ] R. Ramprasad and C. Tang, "Circuit elements at optical frequencies from first principles: A synthesis of electronic structure and circuit theories", J. Appl. Phys., 100, 034305 (2006). [ 26 ] N. Shi and R. Ramprasad,"Atomic-scale dielectric permittivity profiles in slabs and multilayerss ", Phys. Rev. B., 74, 045318 (2006). [ 25 ] R. Ramprasad and N. Shi, "Polarizability of phthalocyanine based molecular systems: A first-principles electronic structure study", Appl. Phys. Lett., 88, 222903 (2006). [ 24 ] N. Shi and R. Ramprasad, "Dielectric properties of ultrathin SiO2 slabs", Appl. Phys. Lett., 87, 262102 (2005). [ 23 ] R. Ramprasad and N. Shi, "Scalability of phononic crystal heterostructures", Appl. Phys. Lett., 87, 111101.pdf (2005). [ 22 ] R. Ramprasad and N. Shi, "Dielectric properties of nanoscale HfO2 slabs", Phys. Rev. B., 72, 052107 (2005). [ 21 ] R. Ramprasad , P. Zurcher, M. Petras, M. Miller and P. Renaud, "Theoretical study of ferromagnetic resonance and eddy current losses in soft magnetic nanoparticle composites at GHz frequencies", J. Appl. Phys., 96, 519 (2004). [ 20 ] R. Ramprasad, "First principles study of migration of oxygen vacancies in Ta2O5", J. Appl. Phys., 95, 954 (2004). [ 19 ] R. Ramprasad, "Phenomenological theory to model leakage currents in metal-insulator-metal capacitor systems", Physica Status Solidi, 239, 59 (2003). [ 18 ] R. Ramprasad, "First principles study of oxygen vacancy induced defect levels in bulk Ta2O5", J. Appl. Phys., 94, 5609 (2003). [ 17 ] R. Ramprasad, "Oxygen vacancy defects in bulk tantalum pentoxide: a density functional study", Microelectronics Eng., 69, 190 (2003). [ 16 ] R. Ramprasad, "First principles energy and stress fields in defected materials", J. Phys.: Condes. Matter, 14, 5497 (2002). [ 15 ] R. Ramprasad, P. Zurcher,M. Petras, M. Miller and P. Renaud,"Fundamental limits of soft magnetic particle composites for high frequency applications", Phys. Stat. Sol.(b), 233, 31 (2002). [ 14 ] Paul von Allmen, R. Ramprasad and L. R. C. Fonseca,,"Calculating the field emission current from a carbon nanotube", Phys. Stat. Sol.(b), 226, 107 (2001). [ 13 ] Victor Mama, L. R. C. Fonseca, A. Pavani Filho, O. R. Monteiro, R. Ramprasad and P. von Allmen,"Porous field emission devices based on polyimide membranes using diode and triode configurations", J. of Vac. Sci. Technol. B, 19, 537 (2001) [ 12 ] R. Ramprasad, L. R. C. Fonseca and Paul von Allmen,"Calculation of the field emission current from a jellium surface using the Bardeen transfer hamiltonian method <http://www.ims.uconn.edu/%7Erampi/publications/p5216_1.pdf> ", Phys. Rev. B., 62, 5216 (2000). [ 11 ] L. R. C. Fonseca, Paul von Allmen and R. Ramprasad,"Numerical simulation of the tunneling current and balistic electron effects in field emission devices", J. Appl. Phys., 87, 2533 (2000). [ 10 ] R. Ramprasad, Paul von Allmen and L. R. C. Fonseca,"Contributions to the work function: a density functional study of adsorbates at graphene ribbon edges", Phys. Rev. B, 60, 6023 (1999). [ 9 ] D. Liao, K. M. Glassford, R. Ramprasad and J. B. Adam,"DFT-LDA study of NO adsorption on Rh(110) surfaces", Surf. Sci., 415, 11 (1998). [ 8 ] W. F. Schneider, K. C. Hass, R. Ramprasad and J.B. Adams,"Density functional Theory study of transformations of nitrogen oxides catalyzed by Cu-exchanged zeolites", J. Phys. Chem. B., 102(19), 3692 (1998). [ 7 ] R. Ramprasad, K. C. Hass, W. F. Schneider, J.B. Adamss,"Cu-dinitrosyl species in zeolites: a density functional molecular cluster study", J. Phys. Chem. B., 101, 6903 (1997). [ 6 ] W. F. Schneider, K. C. Hass, W. F. Schneider, J.B. Adamss,"First -principles analysis of elementary steps in the catalytic decomposition of NO by Cu-exchanged zeolites", J. Phys. Chem. B, 101, 4353 (1997). [ 5 ] R. Ramprasad, W. F. Schneider, K. C. Hass and J.B. Adamss,"A theoretical study of CO and NO vibrational frquencies in Cu-water clusters and implications for Cu-exchanged zeolites", J. Phys. Chem., 101, 1940 (1997). [ 4 ] R. Ramprasad, K. M. Glassford, J. B. Adams and R. I. Masels,"CO on Pd(110): Determination of the optimal adsorption site", Surf. Sci., 360, 31 (1996). [ 3 ] W. F. Schneider, K. C. Hass, R. Ramprasad and J.B. Adams,"Cluster models of Cu binding and CO and NO adsorption in Cu-exchanged zeolites", J. Phys. Chem. B, 100, 6032 (1996). [ 2 ] J.B. Adams, A. Rockett, J. Kieffer, W. Xu, M.Nomura, K. A. Kilian, D. F. Richards and R. Ramprasad, "Atomic-level computer simulation", J. Nucl. Mater., 216, 265 (1994). [ 1 ] R. Ramprasad and R. G. Hoagland, "Thermodynamic properties of small zinc clusters based on atomistic simulations", Modeling Simul. Mater. Sci. Eng. , 1, 189 (1993). Patents: [ 4 ] R. Ramprasad, M. Petras, and C. T. Tsai, "Applications of high impedance surfaces" [US 7136028; issued in Nov. 14, 2006] [ 3 ] R. Ramprasad, M. Petras, and C. T. Tsai "Frequency selective high impedance surface" [US 7136029; issued in Nov. 14, 2006] [ 2 ] P. Renaud and R. Ramprasad, "Layered magnetic material design for high frequency inductor applications" [EP 1536433; issued in June 1, 2005] [ 1 ] R. Ramprasad and M. Petras, "Electromagnetic bandgap microwave filters" [US 6943650 B2; issued in Sep. 13, 2005]
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