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Ram Kuntal Hazra

Indian Association for the Cultivation of Science

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Journal of Theoretical and Computational Chemistry | 2006

RESPONSE OF ENERGY LEVELS AND WAVEFUNCTIONS OF 2-D ARTIFICIAL ATOMS TO CHANGES IN PARAMETERS IN THE HAMILTONIAN

Manas Ghosh; Ram Kuntal Hazra; S.P. Bhattacharyya

We explore the pattern of evolution of energy levels and wavefunctions in a harmonically confined single electron artificial atom in 2 dimensions, in the presence of a perpendicular magnetic field and anharmonic perturbations. A configuration interaction (CI) type of approach in a basis of appropriate harmonic oscillator eigenfunctions is used, leading to a complex sparse hermitian matrix eigenvalue problem. We show that for a given strength of the confining potential descriptors like quantum information entropy, level spacing distribution, degree of localization of one electron density and probability current point to a threshold value for the cyclotron frequency (ωc), beyond which there appears to be a transition from a delocalized description rather than a localized one. No signature of quantum chaos is detected.

Chemical Physics | 2007

Linear and nonlinear response of 2-D single carrier dots: Role of impurity perturbations

Ram Kuntal Hazra; Manas Ghosh; S.P. Bhattacharyya

Chemical Physics Letters | 2004

A linear variational route to the polarizability of 2-D artificial atoms: effects of anharmonicity in the confinement potential

Manas Ghosh; Ram Kuntal Hazra; S.P. Bhattacharyya

International Journal of Quantum Chemistry | 2007

Quantum adiabatic switching route to the impurity modulated states of 2-D quantum dots with different switching functions

Ram Kuntal Hazra; Manas Ghosh; S.P. Bhattacharyya

Chemical Physics Letters | 2009

Metastable impurity perturbed states of 2D single carrier quantum dots

Ram Kuntal Hazra; Manas Ghosh; S.P. Bhattacharyya

Chemical Physics Letters | 2005

Maximizing second hyperpolarizability of single carrier 2D quantum dots: Interplay of strengths of confining potential, magnetic field and anharmonicity

Manas Ghosh; Ram Kuntal Hazra; S.P. Bhattacharyya

Chemical Physics | 2008

Modulation of the electronic states of 2-D single carrier quantum dots due to presence of hole doped impurity perturbations

Ram Kuntal Hazra; Manas Ghosh; S.P. Bhattacharyya

Chemical Physics | 2008

Response dynamics of 2-D quantum dots in the presence of time-varying fields: Anharmonicity and pulse shape effects

Manas Ghosh; Ram Kuntal Hazra; S.P. Bhattacharyya

Chemical Physics Letters | 2007

Linear and non-linear optical response properties of singlet 2-electron quantum dots

Manas Ghosh; Ram Kuntal Hazra; S.P. Bhattacharyya

Chemical Physics Letters | 2008

Information entropy and level-spacing distribution based signatures of quantum chaos in electron doped 2D single carrier quantum dots

Ram Kuntal Hazra; Manas Ghosh; S.P. Bhattacharyya

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