Nenad Vukmirović

Institute of Physics Belgrade

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

P. Harrison

University of Leeds

D. Indjin

University of Leeds

Z. Ikonić

University of Leeds

Lin‐Wang Wang

Institute of Semiconductors

V. D. Jovanović

Institute for Technology of Nuclear and other Mineral Raw Materials

Veljko Janković

University of Belgrade

Ivana Savić

National University of Ireland

V. Milanović

University of Belgrade

Stanko Tomić

Institute of Economic Sciences

R. W. Kelsall

University of Leeds

Cooperative Institutions

University of Belgrade

Lawrence Berkeley National Laboratory

Institute of Physics Belgrade

University of Leeds

University of California, Berkeley

Centre National de la Recherche Scientifique

Berkeley College

Zemun Hospital

University of Cambridge

Lund University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Charge Transport in a Quantum Dot Supercrystal

The Journal of Physical Chemistry C (2011)

Iek‐Heng Chu Marina Radulaski Nenad Vukmirović Hai‐Ping Cheng Lin‐Wang Wang

Colloidal semiconductor quantum dots connected by organic or inorganic molecules can form periodic supercrystals. These supercrystals can be used for various types of electronic and optical applications with properties superior to those of random quantum dots and organic polymer mixtures. We have used ab initio calculations to study the charge transport and carrier mobility in such supercrystals. Among the different possible charge transport mechanisms, we found that the phonon-assisted hopping is the most likely mechanism. The calculated carrier mobility agrees well with the experimentally measured results. Our predictions of the size and temperature dependences on the mobility are awaiting experimental confirmation.

Charge carrier

Organic semiconductor

Electron Mobility

10.1021/jp206526s

Cite

Citations (80)

Polymers with Tailored Electronic Structure for High Capacity Lithium Battery Electrodes

Advanced Materials (2011)

Gao Liu Shidi Xun Nenad Vukmirović Xiangyun Song P. Olalde-Velasco

A conductive polymer is developed for solving the long-standing volume change issue in lithium battery electrodes. A combination of synthesis, spectroscopy and simulation techniques tailors the electronic structure of the polymer to enable in situ lithium doping. Composite anodes based on this polymer and commercial Si particles exhibit 2100 mAh g−1 in Si after 650 cycles without any conductive additive. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Lithium battery

10.1002/adma.201102421

Cite

Citations (543)

Electron Transport and Terahertz Gain in Quantum-Dot Cascades

IEEE Photonics Technology Letters (2008)

Nenad Vukmirović D. Indjin Z. Ikonić P. Harrison

Electron transport through quantum-dot (QD) cascades was investigated using the formalism of nonequilibrium Green's functions within the self-consistent Born approximation. Polar coupling to optical phonons, deformation potential coupling to acoustic phonons, as well as anharmonic decay of longitudinal optical phonons were included in the simulation. A QD cascade laser structure comprising two QDs per period was designed and its characteristics were simulated. Significant values of population inversion enabling lasing in the terahertz frequency range were predicted, with operating current densities being more than an order of magnitude smaller than in existing terahertz quantum-well-based quantum-cascade lasers.

Population inversion

Quantum cascade laser

10.1109/lpt.2007.912533

Cite

Citations (19)

Electron transport in quantum cascade lasers in a magnetic field

Physical Review B (2006)

Ivana Savić Z. Ikonić Vitomir Milanović Nenad Vukmirović V. D. Jovanović

A theoretical model of electron transport in quantum cascade lasers subjected to a magnetic field is developed. The Landau level electronic structure was calculated from the envelope-function Schr\"odinger equation within the effective-mass approximation. The electron transport in a magnetic field was modeled using the self-consistent rate-equation description for the full period of the cascade and its interaction with adjacent periods. The scattering processes included in the model are electron--longitudinal-optical-phonon, electron--longitudinal-acoustic-phonon, and electron-electron scattering. All these processes show oscillatory behavior with magnetic field, and their interplay determines the electron transport and the output characteristics of quantum cascade lasers in magnetic field. The model was applied to investigate the influence of magnetic field on the performance of a $\mathrm{GaAs}∕\mathrm{AlGaAs}$ quantum cascade laser emitting at $\ensuremath{\lambda}\ensuremath{\approx}11.4\phantom{\rule{0.3em}{0ex}}\mathrm{\ensuremath{\mu}}\mathrm{m}$ [P. Kruck et al., Appl. Phys. Lett. 76, 3340 (2000)]. The calculated results show good overall agreement with the available experimental data.

Landau quantization

Electron scattering

Quantum cascade laser

10.1103/physrevb.73.075321

Cite

Citations (25)

Ab-initio calculations of temperature dependent electronic structures of inorganic halide perovskite materials

Physical Chemistry Chemical Physics (2023)

Milan Jocić Nenad Vukmirović

We performed ab initio calculations of temperature dependent electronic structure of inorganic halide perovskite materials. The band gaps obtained for cubic structure of these materials are in good agreement with available experimental results.

10.1039/d3cp02054a

Cite

Citations (5)

Charge carrier motion in disordered conjugated polymers: a multiscale ab-initio study - eScholarship

Nenad Vukmirović

We developed an ab-initio multiscale method for simulation of carrier transport in large disordered systems, based on direct calculation of electronic states and electron-phonon coupling constants. It enabled us to obtain the never seen before rich microscopic details of carrier motion in conjugated polymers, which led us to question several assumptions of phenomenological models, widely used in such systems. The macroscopic mobility of disordered poly(3- hexylthiophene) (P3HT) polymer, extracted from our simulation, is in agreement with experimental results from the literature.

Charge carrier

Source

Cite

Citations (0)

Microscopic insight into the hopping transport in disordered semiconducting polymers

Bulletin of the American Physical Society (2010)

Nenad Vukmirović Lin‐Wang Wang

Variable-range hopping

Source

Cite

Citations (0)

Symmetry-based calculation of single-particle states and intraband absorption in hexagonal GaN/AlN quantum dot superlattices

Journal of Physics Condensed Matter (2006)

Nenad Vukmirović Zoran Ikonić D. Indjin P. Harrison

We present a symmetry-based method for the efficient calculation of energy levels in hexagonal GaN/AlN quantum dots within the framework of a k·p model. The envelope functions are expanded into a plane wave basis on a hexagonal lattice and the group projector method is used to adapt the basis to exploit the symmetry, resulting in block diagonalization of the corresponding Hamiltonian matrix into six matrices and classification of the states by the quantum number of total quasi-angular momentum. The method is applied to the calculation of the electron and hole single-particle states in a quantum dot superlattice. The selection rules for absorption of electromagnetic waves in the dipole approximation are established and the intraband optical absorption matrix elements are found. Good agreement with the available experimental data on intraband optical absorption is found.

Hamiltonian (control theory)

10.1088/0953-8984/18/27/008

Cite

Citations (19)

Calculations of electron mobility in II-VI semiconductors

Physical review. B./Physical review. B (2021)

Nenad Vukmirović

Electron mobility in the conduction band of II-VI semiconductors ZnSe, CdTe, ZnTe, and CdSe was studied. Temperature dependence of mobility was calculated using the methodology based on density functional theory calculations of the electronic states, phonon modes, and electron-phonon coupling constants, along with Fourier-Wannier procedure for interpolation to a dense grid in momentum space. The mobilities obtained from calculations within generalized gradient approximation of density functional theory overestimate the experimental mobility several times. The calculation that used improved electronic band structure and high-frequency dielectric constants obtained using a hybrid functional lead to a very good agreement with experimental mobilities for most of the materials studied. It was also found that the Fr\"ohlich model provides a reasonably good estimate of mobilities around room temperature where longitudinal optical phonons provide the dominant scattering mechanism, as expected for these direct gap materials where all relevant electronic states are in the vicinity of the $\mathrm{\ensuremath{\Gamma}}$ point. The results indicate as well that the long-ranged part of electron-phonon interaction fully determines the electron mobility in the materials studied. For this reason, the approach where only this part of electron-phonon interaction is calculated using the relevant analytical formulas allows for accurate calculation of mobility without the use of the interpolation procedure for electron-phonon coupling constants.

Electron Mobility

Coupling constant

10.1103/physrevb.104.085203

Cite

Citations (13)

Origin of detection wavelength tuning in quantum dots-in-a-well infrared photodetectors

Applied Physics Letters (2006)

Nenad Vukmirović D. Indjin Z. Ikonić P. Harrison

A theoretical investigation is performed in order to understand the origin of change of the operating wavelength of quantum dots-in-a-well photodetectors when the well width is varied. The energy levels and wave functions were found using the eight-band strain dependent k∙p model and the intraband optical absorption spectrum was calculated in the dipole approximation within the framework of first order perturbation theory. It was found that the pure effect of changes of well width cannot be responsible for the shifts of the peaks observed in experiment [Raghavan et al., J. Appl. Phys. 96, 1036 (2004)], which are therefore ascribed to unintentional changes in dot dimensions.

10.1063/1.2216920

Cite

Citations (21)