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Dive into the research topics where Pawel Redlinski is active.

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Featured researches published by Pawel Redlinski.


Physical Review B | 2005

Zero- and one-dimensional magnetic traps for quasiparticles in diluted magnetic semiconductors

Pawel Redlinski; T. Wojtowicz; T. G. Rappoport; A. Libal; J. K. Furdyna; Boldizsar Janko

We investigate the possibility of trapping quasi-particles possessing spin degree of freedom in hybrid structures. The hybrid system we are considering here is composed of a semi-magnetic quantum well placed a few nanometers below a ferromagnetic micromagnet. We are interested in two different micromagnet shapes: cylindrical (micro-disk) and rectangular geometry. We show that in the case of a micro-disk, the spin object is localized in all three directions and therefore zero-dimensional states are created, and in the case of an elongated rectangular micromagnet, the quasi-particles can move freely in one direction, hence one-dimensional states are formed. After calculating profiles of the magnetic field produced by the micromagnets, we analyze in detail the possible light absorption spectrum for different micromagnet thicknesses, and different distances between the micromagnet and the semimagnetic quantum well. We find that the discrete spectrum of the localized states can be detected via spatially-resolved low temperature optical measurement.


Applied Physics Letters | 2005

Optical response of a ferromagnetic-diluted magnetic semiconductor hybrid structure

Pawel Redlinski; T. G. Rappoport; A. Libal; J. K. Furdyna; Boldizsar Janko; T. Wojtowicz

We investigate the possibility of using local magnetic fields to produce one-dimensional traps in hybrid structures for any quasiparticle possessing spin degree of freedom. We consider a system composed of a diluted magnetic semiconductor quantum well buried below a micron-sized ferromagnetic island. Localized magnetic field is produced by a rectangular ferromagnet in close proximity of a single domain phase. We make quantitative predictions for the optical response of the system as a function of distance between the micromagnet and the quantum well, electronic g-factor, and thickness of the micromagnet.We investigate the possibility of using local magnetic fields to produce one-dimensional traps in hybrid structures for any quasiparticle possessing a spin degree of freedom. We consider a system composed of a diluted magnetic semiconductor quantum well buried below a micron-sized ferromagnetic island. A localized magnetic field is produced by a rectangular ferromagnet kept in a single domain phase. We make quantitative predictions for the optical response of the system as a function of distance between the micromagnet and the quantum well, electronic g factor, and thickness of the micromagnet.


Physical Review B | 2005

Positional Disorder, Spin-Orbit Coupling and Frustration in Ga1 xMnxAs

Gregory A. Fiete; Gergely Zarand; Boldizsar Janko; Pawel Redlinski; C. Pascu Moca

We study the magnetic properties of metallic


Physical Review B | 2005

Binding energy of shallow donors in a quantum well in the presence of a tilted magnetic field

Pawel Redlinski; Boldizsar Janko

{\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}


arXiv: Materials Science | 2005

Ferromagnetic/DMS hybrid structures: one‐ and zero‐dimensional magnetic traps for quasiparticles

Pawel Redlinski; T. Wojtowicz; T. G. Rappoport; A. Libal; J. K. Furdyna; Boldizsar Janko

. We calculate the effective Ruderman-Kittel-Kasuya-Yoshida interaction between Mn spins using several realistic models for the valence band structure of GaAs. We also study the effect of positional disorder of the Mn on the magnetic properties. We find that the interaction between two Mn spins is anisotropic due to spin-orbit coupling both within the so-called spherical approximation and in the more realistic six band model. The spherical approximation strongly overestimates this anisotropy, especially for short distances between Mn ions. Using the obtained effective Hamiltonian we carry out Monte Carlo simulations of finite and zero temperature magnetization and find that, due to orientational frustration of the spins, noncollinear states appear in both valence band approximations for disordered, uncorrelated Mn impurities in the small concentration regime. Introducing correlations among the substitutional Mn positions or increasing the Mn concentration leads to an increase in the remanent magnetization at zero temperature and an almost fully polarized ferromagnetic state.


Physical Review B | 2004

Anomalous behavior of spin-wave resonances in Ga1-xMn xAs thin films

T. G. Rappoport; Pawel Redlinski; X. Liu; Gergely Zarand; J. K. Furdyna; Boldizsar Janko

We present results of variational calculations of the binding energy of a neutral donor in a quantum well in the presence of a magnetic field tilted relative to the QW plane. Assuming that the donor is located in the center of the QW, we perform calculations for parameters typical of a II-VI wide-gap semiconductor heterostructure, using as an example the case of a rectangular CdTe quantum well with CdMgTe barriers. We present the dependence of the binding energy of a neutral donor on the tilt angle and on the magnitude of the applied magnetic filed. As a key result, we show that measurement of the binding energy of a donor at two angles of the magnetic field with respect to the quantum well plane can be used to unambiguously determined the conduction band offset of the materials building up heterostructure.


Bulletin of the American Physical Society | 2006

Quasi-one-dimensional spin polarized states in T-shaped nanostructures

Pawel Redlinski; Boldizsar Janko

We investigated possibility of using local magnetic field originating from ferromagnetic island deposited on the top of semiconductor quantum well to produce zero‐ and one‐dimensional traps for quasi‐particles with spin. In particular we considered two shapes of experimentally made magnets — cylindrical and rectangular. In the case of ferromagnetic micro‐disk the trap can localize spin in three dimensions, contrary to the rectangular micro‐magnet which creates a trap that allows free propagation in one direction. We present in detail prediction for absorption spectrum around the main absorption edge in both type of micro‐magnets.


Bulletin of the American Physical Society | 2006

FFLO surface bound state

Shi-Hsin Lin; Pawel Redlinski; Boldizsar Janko; D. F. Agterberg


arXiv: Materials Science | 2005

Theory of Manganese-Manganese interaction in GaMnAs

Pawel Redlinski; Gergely Zarand; Boldizsar Janko


Bulletin of the American Physical Society | 2005

Effect of carrier concentration on Magnetic Circular Dichroism (MCD) in GaMnAs/ZnSe hybrid structures with Be and Si co-doping

R. Chakarvorty; Ki-Ju Yee; X. Liu; Pawel Redlinski; M. Kutrowski; Lyubov V. Titova; T. Wojtowicz; Jacek K. Furdyna; Boldizsar Janko; M. Dobrowolska

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T. Wojtowicz

Polish Academy of Sciences

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J. K. Furdyna

University of Notre Dame

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Gergely Zarand

Budapest University of Technology and Economics

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T. G. Rappoport

Federal University of Rio de Janeiro

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A. Libal

Los Alamos National Laboratory

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X. Liu

University of Notre Dame

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M. Dobrowolska

University of Notre Dame

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Shi-Hsin Lin

University of Notre Dame

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