Browsing by Keywords "Quantum mechanics"
Now showing items 1-13 of 13
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Colorimetric and near-absolute polarization-insensitive refractive-index sensing in all-dielectric guided-mode resonance based metasurface
(American Chemical Society, 2019)Colorimetric detection of target molecules with insensitivity to incident-light polarization has attracted considerable attention in recent years. This resulted from the ability to provide rapid output and reduced assay ... -
Density profile of a Bose-Einstein condensate inside a pancake-shaped trap: Observational consequences of the dimensional cross-over in the scattering properties
(Elsevier Science B.V., 2002)It is theoretically well known that two-dimensionality of the scattering events in a Bose-Einstein condensate introduces a logarithmic dependence on density in the coupling constant entering a mean-field theory of the ... -
Effect of fractional Fourier transformation on time-frequency distributions belonging to the Cohen class
(Institute of Electrical and Electronics Engineers, 1996-02)We consider the Cohen (1989) class of time-frequency distributions, which can be obtained from the Wigner distribution by convolving it with a kernel characterizing that distribution. We show that the time-frequency ... -
Formation of quantum structures on a single nanotube by modulating hydrogen adsorption
(American Physical Society, 2003)Using first-principles density functional calculations we showed that quantum structures can be generated on a single carbon nanotube by modulating the adsorption of hydrogen atoms. The band gap of the hydrogen-free zone ... -
Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells
(American Chemical Society, 2019)As an attractive materials system for high-performance optoelectronics, colloidal nanoplatelets (NPLs) benefit from atomic-level precision in thickness, minimizing emission inhomogeneous broadening. Much progress has been ... -
k · p Parametrization and linear and circular dichroism in strained monolayer (janus) transition metal dichalcogenides from first-principles
(American Chemical Society, 2021-04-08)Semiconductor monolayer transition metal dichalcogenides (TMDs) have brought a new paradigm by introducing optically addressable valley degree of freedom. Concomitantly, their high flexibility constitutes a unique platform ... -
Ladder approximation in coupled quantum-well systems
(American Physical Society, 2001)We study the contact values of the interlayer pair-correlation function in electron-electron and electron-hole double-layer systems. For this purpose the ladder approximation as generalized to multicomponent systems is ... -
Molecular scale buckling mechanics in individual aligned single-wall carbon nanotubes on elastomeric substrates
(American Chemical Society, 2008)We have studied the scaling of controlled nonlinear buckling processes in materials with dimensions in the molecular range (i.e., ∼1 nm) through experimental and theoretical studies of buckling in individual single-wall ... -
Orbital magnetization of single and double quantum dots in a tight-binding model
(American Physical Society, 2003)We calculate the orbital magnetization of single and double quantum dots coupled both by Coulomb interaction and by electron tunneling. The electronic states of the quantum dots are calculated in a tight-binding model, and ... -
Persuasive evidence for electron–nuclear coupling in diluted magnetic colloidal nanoplatelets using optically detected magnetic resonance spectroscopy
(American Chemical Society, 2019)The incorporation of magnetic impurities into semiconductor nanocrystals with size confinement promotes enhanced spin exchange interaction between photogenerated carriers and the guest spins. This interaction stimulates ... -
Quantum effects of thermal conductance through atomic chains
(2001)We present a formalism for an atomic scale study of phononic heat transfer. The expression of thermal energy current can be cast in the Landauer form and incorporates the transmission coefficient explicitly. Calculation ... -
Tunneling properties of quantum dot arrays in a strong magnetic field
(The American Physical Society, 2004)We study the transport properties of coherently coupled quantum dots in the quantum Hall regime within the Landauer-Büttiker formalism which captures and explains the experimentally observed features in terms of the spectral ... -
Variable and reversible quantum structures on a single carbon nanotube
(2000)The band gap of a semiconducting single wall carbon nanotube decreases and eventually vanishes leading to metalization as a result of increasing radial deformation. This sets in a band offset between the undeformed and ...
