Browsing Department of Physics by Title

Now showing items 692-711 of 793

Tailoring polarisation of attosecond pulses via co-rotating bicircular laser fields

Holkundkar, Amol R. (Elsevier, 2024-01)

The present work introduces a robust way to generate attosecond pulses with tunable ellipticity via high-order harmonic generation by co-rotating bicircular laser fields. The total electric field of the laser fields exhibits ...
A tale of three — tensionless strings and vacuum structure

Banerjee, Aritra (Springer, 2020)

Within the premise of canonical quantisation, we re-examine the quantum structure of bosonic tensionless string theory. In the classical theory, the worldsheet metric degenerates and the Bondi-Metnzer-Sachs (BMS) algebra ...
Tanbeta enhanced contributions to b--> s gamma in SUSY without R-parity

Vaidya, Rishikesh (ARXIV, 2004-11)

We present a systematic analysis of the decay b --> s gamma at the leading log within the framework of Supersymmetry without R-parity. We point out some new contributions in the form of bilinear-trilinear combination of ...
The temperature dependence of the band gap shrinkage due to the electron–phonon interaction in AlxGa1−xAs

Sarkar, Niladri (IOP, 2006-01)

The photoluminescence spectrum of band edge transitions in AlxGa1−xAs is studied as a function of temperature and electron concentration. The parameters that describe the temperature dependence redshift of the band edge ...
Temperature dependent band gap shrinkage in GaN: Role of electron–phonon interaction

Sarkar, Niladri (Elsevier, 2009-08)

We present an experimental investigation of temperature dependent band-gap shrinkage in GaN using photoluminescence spectroscopy. The near-band-edge transition energy shifts to lower energy with increasing temperature. The ...
Temperature-dependent formation-time approach for Υ suppression at energies available at the CERN Large Hadron Collider

Mishra, Madhukar (APS, 2015-03)

We present here a comprehensive model to describe the bottomonium suppression data obtained from the CERN Large Hadron Collider (LHC) at a center-of-mass energy of √sNN=2.76 TeV. We employ a quasiparticle model (QPM) ...
Temporal control of high-order harmonic cutoffs in periodic crystals

Holkundkar, Amol R.; Bandyopadhyay, Jayendra N. (APS, 2023-12)

A theoretical study on the high-order harmonic generation (HHG) in solids by a synthesized driver field is carried out. The vector potential of the driver field is instrumental in determining the Bloch oscillations of the ...
The tensionless path from closed to open strings

Banerjee, Aritra (APS, 2019-09)

We reconsider the tensionless limit on bosonic closed string theory, where the 3D Bondi-Metzner-Sachs (BMS) algebra appears as symmetries on the world sheet, as opposed to two copies of the Virasoro algebra in the case of ...
Tensionless strings in a Kalb-Ramond background

Banerjee, Aritra (Springer, 2024)

We investigate tensionless (or null) bosonic string theory with a Kalb-Ramond background turned on. In analogy with the tensile case, we find that the Kalb-Ramond field has a non-trivial effect on the spectrum only when ...
Tensionless tales of compactification

Banerjee, Aritra (Springer, 2023)

We study circle compactifications of tensionless bosonic string theory, both at the classical and the quantum level. The physical state condition for different representations of BMS3, the worldsheet residual gauge symmetry ...
Testing Statistical Bounds on Entanglement Using Quantum Chaos

Bandyopadhyay, Jayendra N. (APS, 2002-07)

Previous results indicate that while chaos can lead to substantial entropy production, thereby maximizing dynamical entanglement, this still falls short of maximality. Random matrix theory modeling of composite quantum ...
Theoretical estimate of fivefold differential cross sections and spin asymmetry for K-shell (e,3e) processes with transversely-spin-polarized relativistic electrons

Choubisa, Rakesh (APS, 2012-08)

Ab initio first-order Born calculations of the fivefold differential cross section (FDCS) and transverse spin asymmetry in FDCS for the K-shell double ionization of atoms by transversely polarized incident electron are ...
Theoretical Study of Coincident Ionization Cross-sections of Atoms and Molecules by Twisted Electron Impact

Choubisa, Rakesh (APS Division, 2023)

The electron impact ionization process drives various physical processes. The geometry and kinematics of the (e, 2e) and (e, 3e) (single and double ionization) processes help one to study the dynamics of the collision ...
Thermal behavior of a radially deformed black hole spacetime

Mukherjee, Sajal (Springer, 2021-05)

In the present article, we study the Hawking effect and the bounds on greybody factor in a spacetime with radial deformation. This deformation is expected to carry the imprint of a non-Einsteinian theory of gravity, but ...
Thermal evolution and axion emission properties of strongly magnetized neutron stars

Sarkar, Tapomoy Guha (Springer, 2024-03)

Emission properties of compact astrophysical objects such as Neutron stars (NSs) are associated with crucial astronomical observables. In the current work, we obtain the mass, pressure profiles of the non-rotating NSs using ...
Thermal Evolution and Emission Properties of Strongly Magnetized Neutron Star

Mishra, Madhukar (ARXIV, 2023-12)

Emission properties of compact astrophysical objects such as Neutron Stars have been found to be associated with crucial astronomical observables. In the current work, we obtain the mass, pressure and baryon number density ...
Thermal Investigation on Mechanically Milled and Melt - Quenched Superionic Glasses

Dalvi, Anshuman (Indian Association for the Cultivation of Science, 2005)
Thermal properties of a particle confined to a parabolic quantum well in two-dimensional space with conical disclination

Bandyopadhyay, Jayendra N.; Sarkar, Tapomoy Guha (APS, 2014-01)

The thermal properties of a system, comprising of a spinless noninteracting charged particle in the presence of a constant external magnetic field and confined in a parabolic quantum well are studied. The focus has been ...
Thermal stability and crystallization kinetics in superionic glasses using electrical conductivity–temperature cycles

Dalvi, Anshuman (AKJournals, 2010-12)

The present work demonstrates application of electrical conductivity (σ)–temperature (T) cycles to investigate thermal properties viz., crystallization and glass transition kinetics in AgI–Ag2O–V2O5–MoO3 superionic glasses. ...
Thermodynamics of multiple Maxwell demons

Dutta, Sandipan (Springer, 2022-08)

In many assembly line processes like metabolic and signaling networks in biological systems, the products of the first enzyme are the reactant for the next enzyme in the network. Working of multiple machines leads to ...

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