217 citations · 532 across the 9 of their papers we have counts for
8 papers · 1 filter
Raman scattering study of InAs nanowire under high pressure
Dipanwita Majumdar, Abhisek Basu, Goutam Dev Mukherjee +3
The pressure dependent phonon modes of predominant wurtzite InAs nanowires has been investigated in a diamond anvil cell under hydrostatic pressure up to 58 GPa. The TO and LO at G…
Internal field induced enhancement and effect of resonance in Raman scattering of InAs nanowires
Jaya Kumar Panda, Anushree Roy, Achintya Singha +4
An internal field induced resonant intensity enhancement of Raman scattering of phonon excitations in InAs nanowires is reported. The experimental observation is in good agreement…
Raman sensitivity to crystal structure in InAs nanowires
Jaya Kumar Panda, Anushree Roy, Achintya Singha +4
We report a combined electron transmission and Raman spectroscopy study of InAs nanowires. We demonstrate that the temperature dependent behavior of optical phonon energies can be…
Probing the spin states of three interacting electrons in quantum dots
Andrea Gamucci, Vittorio Pellegrini, Achintya Singha +4
We observe a low-lying sharp spin mode of three interacting electrons in an array of nanofabricated AlGaAs/GaAs quantum dots by means of resonant inelastic light scattering. The fi…
Delocalized-localized transition in a semiconductor two-dimensional honeycomb lattice
G. De Simoni, A. Singha, M. Gibertini +7
We report the magneto-transport properties of a two-dimensional electron gas in a modulation-doped AlGaAs/GaAs heterostructure subjected to a lateral potential with honeycomb geome…
Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule
Achintya Singha, Vittorio Pellegrini, Aron Pinczuk +3
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…
Engineering artificial graphene in a two-dimensional electron gas
M. Gibertini, A. Singha, V. Pellegrini +5
At low energy, electrons in doped graphene sheets behave like massless Dirac fermions with a Fermi velocity which does not depend on carrier density. Here we show that modulating a…
Optical Anisotropy of Electronic Excitations in Elliptical Quantum Dots
Achintya Singha, Vittorio Pellegrini, Sokratis Kalliakos +4
The authors report that anisotropic confining potentials in laterally-coupled semiconductor quantum dots (QDs) have large impacts in optical transitions and energies of inter-shell…