308 citations · 2.5k across the 63 of their papers we have counts for
18 papers · 1 filter
Photoluminescence in PbS nanocrystal thin films: Nanocrystal density, film morphology and energy transfer
L. Tsybeskov, M. Alam, S. B. Hafiz +4
We show that photoluminescence properties of PbS nanocrystal thin films are directly related to film morphology and nanocrystal density. In densely packed PbS nanocrystal films, lo…
Plasmon-enhanced second harmonic generation in the laser-irradiated cubic metal nanoparticles
S. V. Fomichev, A. M. Bratkovsky
The plasmon-enhanced second harmonic generation in the subwavelength neutral metal cubic nanoparticles is calculated for the first time in the hydrodynamic and cold plasma approxim…
Perfect memristor: non-volatility, switching and negative differential resistance
Sergey E. Savel'ev, Fabio Marchesoni, Alexander M. Bratkovsky
We propose a simple model of a nanoswitch as a memory resistor. The resistance of the nanoswitch is determined by electron tunneling through a nanoparticle diffusing around one or…
Semiconducting graphene nanomeshes
I. I. Naumov, A. M. Bratkovsky
Symmetry arguments are used to describe all possible two-dimensional periodic corrugations of graphene ("nanomeshes") capable of inducing tangible semiconducting gap. Such nanomesh…
Effects of anisotropic elasticity in the problem of domain formation and stability of monodomain state in ferroelectric films
A. M. Bratkovsky, A. P. Levanyuk
We study cubic ferroelectrics films that become uniaxial with a polar axis perpendicular to the film because of a misfit strain due to a substrate. The main present result is the a…
Molecular dynamics simulations of oxide memristors: thermal effects
S. E. Savel'ev, A. S. Alexandrov, A. M. Bratkovsky +1
We have extended our recent molecular-dynamic simulations of memristors to include the effect of thermal inhomogeneities on mobile ionic species appearing during operation of the d…
Coupled-Mode Theory of Field Enhancement in Complex Metal Nanostructures
Gregory Sun, Jacob Khurgin, Alexander M. Bratkovsky
We describe a simple yet rigorous theoretical model capable of analytical estimation of plasmonic field enhancement in complex metal structures. We show that one can treat the comp…
Molecular dynamics simulations of oxide memory resistors (memristors)
S. E. Savel'ev, A. S. Alexandrov, A. M. Bratkovsky +1
Reversible bipolar nano-switches that can be set and read electronically in a solid-state two-terminal device are very promising for applications. We have performed molecular-dynam…
Polarons in 2+epsilon dimensions and giant figure of merit of semiconducting nanolayers
A. S. Alexandrov, A. M. Bratkovsky
Polarons - electrons coupled with lattice vibrations - play a key role in the transport and optical properties of many systems of reduced dimension and dimensionality. Their confin…
Plasmonic resonances and hot spots in Ag octopods
Ivan I. Naumov, Zhiyong Li, Alexander M. Bratkovsky
New type of plasmonic nanoparticles - silver octopods that can be synthesized with a variety of shapes - have been demonstrated to show versatile optical response using the discret…
Polaronic memristor strongly coupled to electrodes
A. S. Alexandrov, A. M. Bratkovsky
Attractive electron correlations due to an electron-vibron interaction (EVI) can overcome the direct Coulomb repulsion of polarons in strongly deformable molecular quantum dots (MQ…
Lattice-Induced Double-Valley Degeneracy Lifting in Magnetic Field in Graphene
Igor A. Luk'yanchuk, Alexander M. Bratkovsky
We show that the recently discovered double-valley splitting of the low-lying Landau level(s) in the Quantum Hall Effect in graphene can be explained as perturbative orbital intera…
Ensembles of plasmonic nanospheres at optical frequencies and a problem of negative index behavior
E. V. Ponizovskaya, A. M. Bratkovsky
Arrays of metallic nanoparticles support individual and collective plasmonic excitations that contribute to unusual phenomena like surface enhanced Raman scattering, anomalous tran…
Fast polaron switching in degenerate molecular quantum dots
A. S. Alexandrov, A. M. Bratkovsky
Devices for nano- and molecular size electronics are currently a focus of research aimed at an efficient current rectification and switching. Current switching due to conformationa…
Current rectification by simple molecular quantum dots: an ab-initio study
B. Larade, A. M. Bratkovsky
We calculate a current rectification by molecules containing a conjugated molecular group sandwiched between two saturated (insulating) molecular groups of different length (molecu…
Current hysteresis and memory effect in a molecular quantum dot with strong electron-vibron interaction
A. S. Alexandrov, A. M. Bratkovsky
Theory of current hysteresis for tunneling through a molecular quantum dot (MQD) with strong electron-vibron interactions and attractive electron-electron correlations is developed…
Comment on `Origin of combination frequencies in quantum magnetic oscillations of two-dimensional multiband metals' by T. Champel [Phys. Rev. B 65, 153403 (2002); cond-mat/0110154]
A. S. Alexandrov, A. M. Bratkovsky
We analyze the applicability of our analytical theory of combination harmonics in canonical low-dimensional multi-band Fermi liquids, which was recently criticized by Champel (Phys…
General Green's function formalism for transport calculations with spd-Hamiltonians and giant magnetoresistance in Co and Ni based magnetic multilayers
S. Sanvito, C. J. Lambert, J. H. Jefferson +1
A novel, general Green's function technique for elastic spin-dependent transport calculations is presented, which (i) scales linearly with system size and (ii) allows straightforwa…