Department of Physics: Recent submissions

Now showing items 141-160 of 212

    • Flow of binary gas mixtures through small sampling orifices 

      Johnsen, Rainer; Chatterjee, Barun Kumar (A V S AMER INST PHYSICS, 2011-01)
      Species-dependent density changes in binary gas mixtures flowing through a small thin orifice (thickness similar to 10% of diameter) have been studied experimentally using an ion drift tube, covering a limited range of the ...

    • Synthesis and dielectric relaxation studies of Ba substitution in Pb(Zn1/3Nb2/3)O-3 ceramics by co-precipitation method 

      Himanshu, A. K.; Choudhary, B. K.; Singh, S. N.; Gupta, D. C.; Bandyopadhayay, S. K.; Sinha, Tripurari Prasad (ELSEVIER SCIENCE, 2010-07)
      Coexistence of both sharp transition around (T-c1 similar to 305 k) in lower frequency region (similar to 11 kHz) and broad transitions (similar to 350 < T-c2 < 410 K) in the frequency range (11 kHz-1 MHz) of dielectric ...

    • Structural and dielectric properties of A(Fe1/2Ta1/2)O-3 [A = Ba, Sr, Ca] 

      Dutta, Alo; Sinha, Tripurari Prasad (PERGAMON-ELSEVIER SCIENCE, 2011-04)
      The complex perovskite oxide barium iron tantalate (BFT), BaFe1/2Ta1/2O3. strontium iron tantalate (SFT). SrFe1/2Ta1/2O3 and calcium iron tantalate (CFT). CaFe1/2Ta1/2O3 are synthesized by a solid-state reaction technique. ...

    • Dielectric relaxation and conduction mechanism in LaNi3/4M1/4O3 (M = Mo, W) at low temperature 

      Dutta, Alo; Sinha, Tripurari Prasad (ELSEVIER SCIENCE, 2011-02-03)
      In order to investigate the electrical transport in LaNi3/4Mo1/4O3 and LaNi3/4W1/4O3, the dc conductivity and dielectric properties in these polycrystalline materials are investigated in the temperature range from 163K to ...

    • On the possibility of empirically probing the Bohmian model in terms of the testability of quantum arrival/transit time distribution 

      Home, Dipankar; Pan, A. K. (2010-07-05)
      The present article focuses on studying the extent to which the nonuniqueness that is inherent in the standard quantum mechanical calculation of arrival/transit time distribution can be exploited to enable an empirical ...

    • Dielectric and micromechanical studies of barium titanate substituted (1-y)Pb (Zn1/3Nb2/3)O3-yPT ferroelectric ceramics 

      Himanshu, A. K.; Bandyopadhayay, S. K.; Sen, Pintu; Gupta, D. C.; Chakraborty, Riya; Mukhopadhyay, Anoop K.; Choudhary, B. K.; Sinha, Tripurari Prasad (NATL INST SCIENCE COMMUNICATION-NISCAIR, 2010-05-01)
      Dielectric studies have been carried out on barium titanate substituted lead zinc niobate ferroelectrics ceramics, (Pb0.88Ba0.12)[(Zn1/3Nb2/3)(0.88)Ti-0.12)]O-3 and (Pb0.8Ba0.2)[(Zn1/3Nb2/3)(0.8)Ti-0.2)]O-3. The dielectric ...

    • Hafnium oxide thin films studied by time differential perturbed angular correlations 

      Dey, C. C.; Dey, S.; Bedi, S. C.; Das, S. K.; Lorenz, M.; Grundmann, M.; Vogt, J.; Butz, T. (AMER INST PHYSICS, 2011-06-01)
      We report on the study of hafnium oxide thin films grown by pulsed laser deposition at various partial oxygen pressures by Time Differential Perturbed Angular Correlations using the nuclear probe 181Hf(b )181Ta to determine ...

    • Quantum mechanical effect of path-polarization Contextuality for a Single Photon 

      Pan, A. K.; Home, Dipankar (SPRINGER/PLENUM PUBLISHERS, 2010-08-01)
      Using measurements pertaining to a suitable Mach-Zehnder (MZ) type setup, a curious quantum mechanical effect of contextuality between the path and the polarization degrees of freedom of a polarized photon is demonstrated, ...

    • Pair and single neutron transfer with Borromean 8He 

      Lemasson, A.; Navin, A.; Rejmunda, M.; Keeley, N.; Zelevinsky, V.; Bhattacharyya, S.; Shrivastava, A.; Bazin, D.; Beaumel, D.; Blumenfeld, Y.; Chatterjee, A.; Gupta, Dhruba; De France, G.; Jacquot, B.; Labiche, M.; Lemmon, R.; Nanal, V.; Nyberg, J.; Pillay, R. G.; Raabe, R.; Ramachandran, K.; Scarpaci, Jean Antoine; Schmitt, Christoph; Simenel, C.; Stefan, I.; Timis, C. N. (ELSEVIER SCIENCE BV, 2011-03-21)
      Direct observation of the survival of 199Au residues after 2n transfer in the 8He + 197Au system and the absence of the corresponding 67Cu in the 8He + 65Cu system at various energies are reported. The measurements of ...

    • Extreme nuclear shapes examined via giant dipole resonance lineshapes in hot light-mass systems 

      Pandit, D.; Mukhopadhyay, S.; Bhattacharya, S.; Pal, S.; De, A.; Bhattacharya, S.; Bhattacharya, C.; Banerjee, K.; Kundu, S.; Rana, T. K.; Dey, A.; Mukherjee, G.; Ghosh, T.; Gupta, Dhruba; Banerjee, S. R. (American Physical Society, 2010-06-16)
      The influence of alpha clustering on nuclear reaction dynamics is investigated using the giant dipole resonance (GDR) lineshape studies in the reactions (20)Ne (E(lab) = 145, 160 MeV) + (12)C and (20)Ne (E(lab) = 160 MeV) ...

    • Correlated electrons in optically tunable quantum dots: Building an electron dimer molecule 

      Singha, Achintya; Pellegrini, Vittorio; Pinczuk, Aron; Pfeiffer, Loren N.; West, Ken W.; Rontani, Massimo (American Physical Society, 2010-06-15)
      We observe the low-lying excitations of a molecular dimer formed by two electrons in a GaAs semiconductor quantum dot in which the number of confined electrons is tuned by optical illumination. By employing inelastic light ...

    • Two-Dimensional Mott-Hubbard Electrons in an Artificial Honeycomb Lattice 

      Singha, Achintya; Gibertini, M.; Karmakar, B.; Yuan, S.; Polini, M.; Vignale, Giovanni; Katsnelson, M. I.; Pinczuk, A.; Pfeiffer, L. N.; West, K. W.; Pellegrini, V. (AMER ASSOC ADVANCEMENT SCIENCE, 2011-06-03)
      Artificial crystal lattices can be used to tune repulsive Coulomb interactions between electrons. We trapped electrons, confined as a two-dimensional gas in a gallium arsenide quantum well, in a nanofabricated lattice with ...

    • Delocalized-localized transition in a semiconductor two-dimensional honeycomb lattice 

      De Simoni, G.; Singha, Achintya; Gibertini, M.; Karmakar, B.; Polini, M.; Piazza, V.; Pfeiffer, L. N.; West, K. W.; Beltram, F.; Pellegrini, V. (AMER INST PHYSICS, 2010-09-27)
      We report the magnetotransport properties of a two-dimensional electron gas in a modulation-doped AlGaAs/GaAs heterostructure subjected to a lateral potential with honeycomb geometry. Periodic oscillations of the ...

    • Quantum discord in the ground and thermal states of spin clusters 

      Bose, Indrani; Pal, A. K. (IOP PUBLISHING LTD, 2011-02-28)
      Quantum discord (QD) is a general measure of bipartite quantum correlations with a potential role in quantum information processing tasks. Spin clusters serve as ideal candidates for the implementation of some of the ...

    • Motion of bound domain walls in a spin ladder 

      Bose, Indrani; Pal, A. K. (Springer, 2010-09-01)
      The elementary excitation spectrum of the spin-1/2 antiferromagnetic (AFM) Heisenberg chain is described in terms of a pair of freely propagating spinons. In the case of the Ising-like Heisenberg Hamiltonian spinons can ...

    • Energy dependence of gamma detection efficiency for SED R-12 

      Sarkar, R.; Chatterjee, Barun Kumar; Roy, S.C. (ELSEVIER SCIENCE BV, 2010-07-01)
      Superheated emulsion detector consists of droplets of two metastable states, one with a much shorter life-time (second metastable state) than the other (normal metastable state). The SED made from R-12 (CCl(2)F(2)) is ...

    • Reactions with the double-Borromean nucleus 8He 

      Lemasson, A.; Navin, A.; Keeley, N.; Rejmund, M.; Bhattacharyya, S.; Shrivastava, A.; Bazin, D.; Beaumel, D.; Blumenfeld, Y.; Chatterjee, A.; Gupta, Dhruba; De France, G.; Jacquot, B.; Labiche, M.; Lemmon, R.; Nanal, V.; Nyberg, J.; Pillay, R. G.; Raabe, R.; Ramachandran, K.; Scarpaci, Jean Antoine; Simenel, C.; Stefan, I.; Timis, C. N. (American Physical Society, 2010-10-29)
      Differential cross sections for elastic-scattering and neutron-transfer reactions along with cross sections for fusion in the He-8+Cu-65 system are reported at energies above the Coulomb barrier (E-lab = 19.9 and 30.6 MeV). ...

    • Characteristics of acoustic emissions during nucleation of superheated droplets 

      Mondal, P.K.; Chatterjee, Barun Kumar (ELSEVIER SCIENCE BV, 2011-01-17)
      Superheated droplet nucleation and subsequent bubble oscillation produces an acoustic pressure pulse that contains valuable information about the nucleation process. Spectral analysis of the pressure pulse indicates ...

    • Dielectric Studies of Ba Substitution in Lead Zinc Niobate-Lead Zirconium Titanate Ceramics by Precipitation Method 

      Shekhar; Kumar, Brajesh; Himanshu, A. K.; Bandyopadhayay, S. K.; Sinha, Tripurari Prasad (Taylor & Francis, 2010-12-01)
      The polycrystalline samples of (Pb0.90Ba0.10) [(Zn1/3Nb2/3)0.20-(Zr0.51Ti0.49)0.80]O3 [PBZN-PZT] compositions ceramics have been synthesized by substitution of barium in PZN-PZT by precipitation method and finally by ...

    • Dielectric Relaxation and Phase Transition in [Pb0.94Sr.06] [(Mn1/3Sb2/3)0.05(Zr0.55Ti0.45)0.95]O3 Ceramics 

      Sharma, Himanshu; Brajesh, Kumar; Kumari, Kiran; Himanshu, A. K.; Bandhopadhyay, S. K.; Sinha, Tripurari Prasad (Taylor & Francis, 2010-12-01)
      A piezoelectric ceramic composition [Pb0.94Sr0.06][(Mn1/3Sb2/3)0.05 (Zr0.55Ti00.45)0.95]O3 which is 6% Sr2+ substituted PZT ceramics with lead manganese antimonite as an additional hardener dopant is synthesized in pure ...