Browsing Department of Physics by Title

Now showing items 388-407 of 793

Magic Fermions: Carroll and Flat Bands

Banerjee, Aritra (Springer, 2023-03)

The Carroll algebra is constructed as the c → 0 limit of the Poincare algebra and is associated to symmetries on generic null surfaces. In this paper, we begin investigations of Carrollian fermions or fermions defined on ...
Magnetic behavior in (1≤n≤12) clusters: A density functional investigation

Bandyopadhyay, Debashis (AIP, 2014-04)

With a goal to produce magnetic moment in Doped clusters which will be useful for practical applications, we have considered the structure and magnetic properties of Pure Germanium clusters and substitutionally doped it ...
Magnetic mirror cavities as terahertz radiation sources and a means of quantifying radiation friction

Holkundkar, Amol R. (AIP, 2014-10)

We propose a radiation source based on a magnetic mirror cavity. Relativistic electrons are simulated entering the cavity and their trajectories and resulting emission spectra are calculated. The uniformity of the particle ...
Magnetic mirror cavities as THz radiation sources and a means of quantifying radiation friction

Holkundkar, Amol R. (ARXIV, 2014-06)

We propose a radiation source based on a magnetic mirror cavity. Relativistic electrons are simulated entering the cavity and their trajectories and resulting emission spectra are calculated. The uniformity of the particle ...
Magnetic phase transitions in Fe{sub 80-x}Ni{sub x}Cr{sub 20} (14 {<=} x {<=} 30) alloy studied by using {sup 57}Fe Moessbauer spectroscopy

Bandyopadhyay, Debashis (ETDE Web, 1999-11)

This paper reports {sup 57}Fe Moessbauer spectroscopic studies of the polycrystalline samples of the substitutionally disordered, isostructural (fcc), ternary alloy system Fe{sub 80-x}Ni{sub x}Cr{sub 20} for x = 30, 26, ...
Magnetism, structures and stabilities of cluster assembled TM@Si nanotubes (TM = Cr, Mn and Fe): a density functional study

Bandyopadhyay, Debashis (RSC, 2016)

The present study reports transition metal (TM = Cr, Mn and Fe) doped silicon nanotubes with tunable band structures and magnetic properties by careful selection of cluster assemblies as building blocks using the ...
Many body phenomenon within multiple scattering approach in PEELS

Choubisa, Rakesh (IOP, 2020)

Plasmon excitation within multiple scattering approach is being explored. The plasmon loss is described within the so-called quasi-boson approximation, originally proposed by Hedin and further extended by Fujikawa. We ...
Measurement of optical anisotropy in ultrathin films using surface plasmon resonance

Manjuladevi, V.; Gupta, Raj Kumar (Elsevier, 2016-01)

The optical phenomenon, surface plasmon resonance (SPR) is employed for the measurement of optical anisotropy in the ultrathin films fabricated through Langmuir–Blodgett (LB) and self-assembled monolayer (SAM) techniques ...
Mechanical milling assisted synthesis of novel LiTi2(PO4)3-glass-ceramic nanocomposites

Dalvi, Anshuman (Elsevier, 2018-03)

In order to enhance the ionic conductivity in Li+ ion NASICONs, LiTi2(PO4)3 (LTP), novel LTP-glass–ceramic composites have been prepared by mechanical ball milling assisted synthesis route. Composites were prepared using ...
Mechanochemically synthesized amorphous superionic systems for solid-state batteries

Dalvi, Anshuman (Elsevier, 2002-06)

Solid-state electrochemical cells of the type Ag|a-SIC|I2 are fabricated using mechanochemically synthesized amorphous superionic conductors (a-SICs), AgI–Ag2O–MxOy (MxOy=B2O3, V2O5, CrO3) as electrolytes. The typical value ...
Melting of DNA in confined geometries

Singh, Navin (Springer, 2020-09)

The stability of DNA molecules during viral or biotechnological encapsulation is a topic of active current research. We studied the thermal stability of double-stranded DNA molecules of different lengths in a confined ...
Melting of DNA in confined geometry

Singh, Navin (ARXIV, 2019-03)

The stability of DNA molecule during the encapsulation process is a topic of intense research. We study the thermal stability of the double-stranded DNA molecule of different lengths in a confined space. Using a statistical ...
Melting of dsDNA attached with AuNPs

Singh, Navin (Springer, 2023-07)

DNA-linked gold nanoparticles (DNA-AuNPs) are combined nanomaterials that contain the optical and electronic properties of AuNPs with the unique functions of DNA. These hybrid systems are used in various nanobiotechnology, ...
META Ion trapping in nematic liquid crystal by incorporating functionalised silver nanoparticles. P. 4

Manjuladevi, V.; Gupta, Raj Kumar (INIS, 2019-07)

In this work, the effect of functionalised silver nanoparticles (f-AgNPs) on the dielectric constant, electrical conductivity and birefringence of a rod shaped NLC 4-trans-pentyl cyclohexylcyanobenzene (5PCH) has been ...
Metric Deformation and Boundary Value Problems in 2D

Sarkar, Tapomoy Guha (OUP, 2012-01)

A new analytical formulation is prescribed to solve the Helmholtz equation in 2D with arbitrary boundary. A suitable diffeomorphism is used to annul the asymmetries in the boundary by mapping it into an equivalent circle. ...
The Meyer–Neldel rule and hopping conduction

Dalvi, Anshuman (Elsevier, 2012-04)

A Meyer–Neldel rule (MNR)-type relationship is found to exist between the slope (activation energy) and the intercept (prefactor), in the plot of hopping conductivity. This new relation (hopping MNR) is obeyed by a large ...
Mg and Si dopant incorporation and segregation in GaN

Gangopadhyay, Subhashis (Wiley, 2011-03)

The surface segregation of Mg and Si dopant species and theiratomic incorporation sites in GaN films grown by metal-organicvapour phase epitaxy (MOVPE) on sapphire (0001) substrateshave been analysed by X-ray photoemission ...
Micromagnetic simulations of the domain structure and the magnetization reversal of Co50Ni50/Pt multilayer dots

Nair, Sindhu S. (Elsevier, 2002-01)

The domain structure and the switching field of Co50Ni50/Pt multilayer dots, prepared by laser interference lithography, were micromagnetically simulated. The simulations were carried out with a three-dimensional simulation ...
Microstructural characteristics and phonon structures in luminescence from surface oxidized Ge nanocrystals embedded in matrix

Gangopadhyay, Subhashis (AIP, 2010-09)

Ge nanocrystals embedded in matrices were prepared by rf magnetron sputtering technique. Transmission electron micrographs reveal the formation of spherical shape Ge nanocrystals of 4–6 nm diameters for and 6–9 nm for ...
Microstructural, chemical bonding, stress development and charge storage characteristics of Ge nanocrystals embedded in hafnium oxide

Gangopadhyay, Subhashis (Springer, 2010-08)

We have grown Ge nanocrystals (NCs) (4.0–9.0 nm in diameter) embedded in high-k HfO2 matrix for applications in floating gate memory devices. X-ray photoelectron spectroscopy has been used to probe the local chemical bonding ...

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