123 citations · 476 across the 44 of their papers we have counts for
17 papers · 1 filter
Band engineering and elastic properties of strained armchair graphene nanoribbons: semiconductor vs metallic characteristics
Sanjay Prabhakar, Roderick Melnik
An odd number of zigzag edges in armchair graphene nanoribbons and their mechanical properties (e.g., Young's modulus, Poisson ratio and shear modulus) have potential interest for…
Valley-dependent Lorentz force and Aharonov-Bohm phase in strained graphene p-n junction
Sanjay Prabhakar, Rabindra Nepal, Roderick Melnik +1
Veselago lens focusing in graphene p-n junction is promising for realizations of new generation electron optics devices. However, the effect of the strain-induced Aharonov-Bohm int…
Spin relaxation in strained graphene nanoribbons: armchair vs zigzag edges
Sanjay Prabhakar, Roderick Melnik, Shyam Badu
We study the influence of ripple waves originating from the electromechanical effects on spin relaxation caused by electromagnetic fields in armchair and zigzag graphene nanoribbon…
Geometric spin manipulation in semiconductor quantum dots
Sanjay Prabhakar, Roderick Melnik, Akira Inomata
We propose a method to flip the spin completely by an adiabatic transport of quantum dots. We show that it is possible to flip the spin by inducing a geometric phase on the spin st…
Thermo-electromechanical effects in relaxed shape graphene and bandstructures of graphene quantum dots
Sanjay Prabhakar, Roderick Melnik, Luis L. Bonilla +1
We investigate the in-plane oscillations of the relaxed shape graphene due to externally applied tensile edge stress along both the armchair and zigzag directions. We show that the…
Coupled multiphysics, barrier localization, and critical radius effects in embedded nanowire superlattices
Sanjay Prabhakar, Roderick Melnik, Luis L. Bonilla
The new contribution of this paper is to develop a cylindrical representation of an already known multiphysics model for embedded nanowire superlattices (NWSLs) of wurtzite structu…
Spin echo dynamics under an applied drift field in graphene nanoribbon superlattices
Sanjay Prabhakar, Roderick Melnik, Luis L Bonilla +1
We investigate the evolution of spin dynamics in graphene nanoribbon superlattices (GNSLs) with armchair and zigzag edges in the presence of a drift field. We determine the exact e…
Electrical control of phonon mediated spin relaxation rate in semiconductor quantum dots: the Rashba vs the Dresselhaus spin-orbit couplings
Sanjay Prabhakar, Roderick Melnik, Luis L. Bonilla
In symmetric quantum dots (QDs), it is well known that the spin-hot spot (i.e., the cusp-like structure due to the presence of degeneracy near the level or anticrossing point) is p…
Gate control of Berry phase in III-V semiconductor quantum dots
Sanjay Prabhakar, Roderick Melnik, Luis L Bonilla
Berry phase in semiconductor quantum dots (QDs) can be induced by moving the dots adiabatically in a closed loop with the application of the distortion potential in the lateral dir…
Spin transition rates in nanowire superlattices: Rashba spin-orbit coupling effects
Sanjay Prabhakar, Roderick Melnik, Luis L. Bonilla
We investigate the influence of Rashba spin-orbit coupling in a parabolic nanowire modulated by longitudinal periodic potential. The modulation potential can be obtained from reali…
Anisotropic effects and phonon induced spin relaxation in gate-controlled semiconductor quantum dots
Sanjay Prabhakar, Shohini Ghose, Roderick Melnik +1
In this paper, a detailed analysis of anisotropic effects on the phonon induced spin relaxation rate in III-V semiconductor quantum dots (QDs) is carried out. We show that the acci…
The influence of anisotropic gate potentials on the phonon induced spin-flip rate in GaAs quantum dots
Sanjay Prabhakar, Roderick V. N. Melnik, Luis L. Bonilla
We study the anisotropic orbital effect in the electric field tunability of the phonon induced spin-flip rate in quantum dots (QDs). Our study shows that anisotropic gate potential…
Manipulation of single electron spin in a GaAs quantum dot through the application of geometric phases: The Feynman disentangling technique
Sanjay Prabhakar, James Raynolds, Akira Inomata +1
The spin of a single electron in an electrically defined quantum dot in a 2DEG can be manipulated by moving the quantum dot adiabatically in a closed loop in the 2D plane under the…
Excitation of plasmons in two-dimensional electron gas with defects by microwaves: Wake-field method
Eduard Takhtamirov, Roderick V. N. Melnik
We develop an analytical method to find plasmons generated by microwaves in a two-dimensional electron gas with defects. The excitations are expressed in terms of the wake field of…
Manipulation of the Land g-factor in InAs quantum dots through the application of anisotropic gate potentials: Exact diagonalization, numerical and perturbation methods
Sanjay Prabhakar, James E Raynolds, Roderick Melnik
We study the variation in the Land g-factor of electron spins induced by both anisotropic gate potentials and magnetic fields in InAs quantum dots for possible im…
Coupled Effects in Quantum Dot Nanostructures with Nonlinear Strain and Bridging Modelling Scales
Roderick V. N. Melnik, Roy Mahapatra
We demonstrate that the conventional application of linear models to the analysis of optoelectromechanical properties of nanostructures in bandstructure engineering could be inadeq…
Electronic structure of wurtzite quantum dots with cylindrical symmetry
L. C. Lew Yan Voon, C. Galeriu, B. Lassen +2
This paper presents a six-band k.p theory for wurtzite semiconductor nanostructures with cylindrical symmetry. Our work extends the formulation of Vahala and Sercel [Physical Revie…