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Search Publications by: Garnett W. Bryant (Fed)

Displaying 26 - 50 of 338

Electron-Phonon Scattering in Quantum Wires Exposed to a Perpendicular Magnetic Field

October 12, 2021

Author(s)

M Aghasyan, S M. Badalyan, Garnett W. Bryant

A theory of test electron and electron temperature relaxation in quantum wires due to acoustical and optical phonon scattering is presented. The intra- and inter-subband scattering rates are represented as an average of rate kernels weighted by electron

Exciton-Plasmon Interaction and Hybrid Excitons in Semiconductor-Metal Nanoparticle Assemblies

October 12, 2021

Author(s)

A O. Govorov, Garnett W. Bryant, Wei Zhang, T Skieni, J Lee, N A. Kotov, Joseph M. Slocik, Rajesh R. Naik

We describe physical properties of excitons in hybrid complexes composed of semiconductor and metal nanoparticles. The interaction between individual nanoparticles is revealed as an enhancement or suppression of emission. Enhanced emission comes from

First-Principles Calculations of Structural, Electronic, Vibrational and Magnetic Properties of C 60 and C 48 N 12 : a Comparative Study

October 12, 2021

Author(s)

R H. Xie, Garnett W. Bryant, L Jensen, J Zhao, J H. Smith

We perform first-principles calculations of the structural, electronic, vibrational and magnetic properties of C 48 N 12 azafullerene and C 60. Full geometrical optimization has shown that C 48 N 12 is characterized by several distinguish features: only

Optical Fine Structure of II-VI and III-V Nanocrystals: The Role of d Orbitals in a Tight-Binding Approach

October 12, 2021

Author(s)

J G. Diaz, Garnett W. Bryant, W Jaskolski

The electronic structure of GaAs and CdSe nanocrystals is studied by using a nearest-neighbor tight-binding model extended to include d orbitals. Our results show that the inclusion of $d$ orbitals in a minimal basis set is necessary for a proper

Plasmons in Nearly Touching Metallic Nanoparticles: Singular Response in the Limit of Touching Dimers

October 12, 2021

Author(s)

I Romero, Javier Aizpurua, Garnett W. Bryant, F J. Garcia de Abajo

The response of gold nanoparticle dimers is studied theoretically near and beyond the limit where the particles are touching. As the particles approach each other, a dominant dipole feature is observed that is pushed into the infrared due to interparticle

Pressure-Induced Optoelectronic Properties of InP Nanocrystals: Tight-Binding Approach

October 12, 2021

Author(s)

J G. Diaz, W Jaskolski, M Zielinski, Garnett W. Bryant

An empirical tight-binding theory is used to investigate pressure effects on the electronic and optical properties of InP nanocrystals. For bulk InP, our model predicts the Gamma - X crossing of the conduction band minima at exactly the same lattice

Semiconductor-Metal Nanoparticle Molecules: Hybrid Excitons and Non-Linear Fano Effect

October 12, 2021

Author(s)

Wei Zhang, A O. Govorov, Garnett W. Bryant

Modern nanotechnology opens the possibility of combining nanocrystals of various materials with different characteristics in one superstructure. The resultant superstructure may provide new physical properties not encountered in homogeneous systems. We

Strain and Spin-Orbit Effects in Self-Assembled Quantum Dots

October 12, 2021

Author(s)

M Zielinski, W Jaskolski, Javier Aizpurua, Garnett W. Bryant

The effects of strain and spin-orbit interaction in self-assembled lens-shaped InAs/GaAs quantum dots are investigated. Calculations are performed with empirical tight-binding theory supplemented by the valence force field method to account for effects of

Strain Effects on the Electronic Structure of Strongly Coupled Self-Assembled InAs/GaAs Quantum Dots: Tight-Binding Approach

October 12, 2021

Author(s)

W Jaskolski, M Zielinski, Garnett W. Bryant, Javier Aizpurua

We present an atomistic tight-binding study of the electronic structure and optical properties of vertically stacked, double, self-assembled, InAs/GaAs quantum dots. The investigated dots are lens-shaped and are situated on wetting layers. We study

Theory of InP Nanocrystals Under Pressure

October 12, 2021

Author(s)

J G. Diaz-Garcia, Garnett W. Bryant, W Jaskolski

An empirical tight-binding theory which includes the effects of lattice relaxation is employed to investigate the opto-electronic properties of InP nanocrystals under an external hydrostatic pressure. For bulk InP, our model describes accurately the

Tight-Binding Method and Multiband Effective Mass Theory Applied to CdS Nanocrystals: Single-Particle Effects and Optical Spectra Fine Structure

October 12, 2021

Author(s)

J G. Diaz-Garcia, J Planelles, Garnett W. Bryant, Javier Aizpurua

Optical spectra of CdS nanocrystals are interpreted by using both the atomistic tight-binding method and multiband effective-mass theory. Both methods correctly describe the energy splitting between the two lowestoptically active transitions and their

Tight-Binding Theory of ZnS/CdS Nanoheterostructures: The Role of Strain and d Orbitals

October 12, 2021

Author(s)

J G. Diaz, M Zielinski, W Jaskolski, Garnett W. Bryant

The electronic and optical properties of colloidal multi-shell ZnS/CdS nanoheterostructures have been studied in the framework of empirical tight-binding models. Our approach takes into account the effects of the strain caused by the large lattice mismatch

Single-Molecule Measurements Spatially Probe States Involved in Electron Transfer from CdSe/CdS Core/Shell Nanorods

September 16, 2021

Author(s)

Garnett W. Bryant, Rachel Morin, Elena Shevchenko, Yuchen Sha, Matthew Pelton

Semiconductor nanorods with charge-accepting molecules adsorbed on their surfaces serve as model systems for solar energy conversion. An electron photoexcited from the valence band of the nanorod to a high-energy state in the conduction band will relax and