Filinov, A., Ludwig, P., Bonitz, M., Lozovik, Yu. E.
Using an adiabatic approximation we derive an effective interaction potentially for spatially indirect excitons. Using this potential and path integral Monte Carlo simulations we study exciton...
Effects of strong correlations for 2D Bose-Einstein condensed dipolar excitons (2007)
Lozovik, Yu. E., Kurbakov, I. L., Astrakharchik, G. E., Boronat, J., Willander, M.
By doing quantum Monte Carlo ab initio simulations we show that dipolar excitons, which are now under experimental study, actually are strongly correlated systems. Strong correlations manifest in...
Superfluidity of two- dimensional excitons in flat and harmonic traps (2007)
Lozovik, Yu. E., Kurbakov, I. L., Willander, M.
Superfluid exciton density and superfluid transition (crossover) temperature are calculated for 2D excitons in large-size flat and harmonic traps. A generalized local density approximation for the...
Mesoscopic Coulomb Supersolid (2007)
Filinov, A., Böning, J., Bonitz, M., Lozovik, Yu. E.
When a few tens of charged particles are trapped in a spherical electrostatic potential at low temperature they form concentric shells resembling atoms. These ``artificial atoms'' can be easily...
Melting of trapped few particle systems (2007)
Böning, J., Filinov, A., Ludwig, P., Baumgartner, H., Bonitz, M., Lozovik, Yu. E.
In small confined systems predictions for the melting point strongly depend on the choice of quantity and on the way it is computed, even yielding divergent and ambiguous results. We present a very...
Super-Tonks-Girardeau regime in trapped one-dimensional dipolar gases (2007)
Astrakharchik, G. E., Lozovik, Yu. E.
Possible signatures of a super-Tonks-Girardeau gas in bosonic systems of trapped quasi-one-dimensional dipoles are discussed at zero temperature. We provide estimation of the frequency of the lowest...
Low-frequency spectroscopy of superconducting photonic crystals (2007)
Poddubny, A. N., Ivchenko, E. L., Lozovik, Yu. E.
Transmission, reflection and absorption of electromagnetic radiation and photon dispersion law for 2D photonic crystals with superconducting elements are studied. The calculation of optical...
Ground state properties of a homogeneous 2D system of Bosons with dipolar interactions (2007)
Astrakharchik, G. E., Boronat, J., Casulleras, J., Kurbakov, I. L., Lozovik, Yu. E.
The ground-state phase properties of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo techniques. Limitations of mean-field theory in a...
Quantum Dot Version of Berry's Phase: Half-Integer Orbital Angular Momenta (2007)
Mur, V. D., Narozhny, N. B., Petrosyan, A. N., Lozovik, Yu. E.
We show that Berry's geometrical (topological) phase for circular quantum dots with an odd number of electrons is equal to \pi and that eigenvalues of the orbital angular momentum run over...
Weakly interacting two-dimensional system of dipoles: limitations of mean-field theory (2006)
Astrakharchik, G. E., Boronat, J., Casulleras, J., Kurbakov, I. L., Lozovik, Yu. E.
We consider a homogeneous 2D Bose gas with repulsive dipole-dipole interactions. The ground-state equation of state, calculated using the Diffusion Monte Carlo method, shows quantitative differences...
Crystallization in mass-asymmetric electron-hole bilayers (2006)
Ludwig, P., Filinov, A., Lozovik, Yu. E., Stolz, H., Bonitz, M.
We consider a \textit{mass-asymmetric} electron and hole bilayer. Electron and hole Coulomb correlations and electron and hole quantum effects are treated on first princles by path integral Monte...
Off-diagonal correlations of the Calogero-Sutherland model (2006)
Astrakharchik, G. E., Gangardt, D. M., Lozovik, Yu. E, Sorokin, I. A.
We study correlation functions of the Calogero-Sutherland model in the whole range of the interaction parameter. Using the replica method we obtain analytical expressions for the long-distance...
Quantum phase transition in a two-dimensional system of dipoles (2006)
Astrakharchik, G. E., Boronat, J., Kurbakov, I. L., Lozovik, Yu. E.
The ground-state phase diagram of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo technique. Our calculation predicts a quantum phase...
Dynamical Casimir Effect in a one-dimensional uniformly contracting cavity (2006)
Fedotov, A. M., Lozovik, Yu. E., Narozhny, N. B., Petrosyan, A. N.
We consider particle creation (the Dynamical Casimir effect) in a uniformly contracting ideal one-dimensional cavity non-perturbatively. The exact expression for the energy spectrum of created...
Off-diagonal correlations of the Calogero-Sutherland model (2006)
Astrakharchik, G. E., Gangardt, D. M., Lozovik, Yu. E, Sorokin, I. A.
We study correlation functions of the Calogero-Sutherland model in the whole range of the interaction parameter. Using the replica method we obtain analytical expressions for the long-distance...
Off-diagonal correlations of the Calogero-Sutherland model (2006)
Astrakharchik, G. E., Gangardt, D. M., Lozovik, Yu. E, Sorokin, I. A.
We study correlation functions of the Calogero-Sutherland model in the whole range of the interaction parameter. Using the replica method we obtain analytical expressions for the long-distance...
Off-diagonal correlations of the Calogero-Sutherland model (2005)
Astrakharchik, G. E., Gangardt, D. M., Lozovik, Yu. E, Sorokin, I. A.
We study correlation functions of the Calogero-Sutherland model in the whole range of the interaction parameter. Using the replica method we obtain analytical expressions for the long-distance...
Ground-state properties of a one-dimensional system of dipoles (2005)
Arkhipov, A. S., Astrakharchik, G. E., Belikov, A. V., Lozovik, Yu. E.
A one-dimensional (1D) Bose system with dipole-dipole repulsion is studied at zero temperature by means of a Quantum Monte Carlo method. It is shown that in the limit of small linear density the...
Filinov, A. V., Riva, C., Peeters, F. M., Lozovik, Yu. E., Bonitz, M.
We present a first-principle path integral Monte-Carlo (PIMC) study of the binding energy of excitons, trions (positively and negatively charged excitons) and biexcitons bound to single-island...
Rotated and scaled center of mass tomography for several particles (2003)
Arkhipov, A. S., Lozovik, Yu. E., Man'ko, V. I.
The tomographic map of quantum state of a system with several degrees of freedom which depends on one random variable, analogous to center of mass considered in rotated and scaled reference frame in...
Simulation of wavepacket tunneling of interacting identical particles (2003)
Lozovik, Yu. E., Filinov, A. V., Arkhipov, A. S.
We demonstrate a new method of simulation of nonstationary quantum processes, considering the tunneling of two {\it interacting identical particles}, represented by wave packets. The used method of...
Simulation of tunneling in the quantum tomography approach (2003)
Lozovik, Yu. E., Sharapov, V. A., Arkhipov, A. S.
The new method for the simulation of nonstationary quantum processes is proposed. The method is based on the tomography representation of quantum mechanics, {\it i.e.}, the state of the system is...
Single-electron control of Wigner crystallization (2001)
Bonitz, M., Golubnychiy, V., Filinov, A. V., Lozovik, Yu. E.
Wigner crystallization in mesoscopic quantum dots containing only few ($N < 50$) electrons exhibits a number of interesting peculiarities: (i) there exist two distinct crystal phases, and (ii) the...
Two-dimensional electron crystals in single and double layers (2001)
Filinov, A. V., Bonitz, M., Lozovik, Yu. E.
We present results of Monte-Carlo simulations for finite 2D single and bilayer systems. Strong Coulomb correlations lead to arrangement of particles in configurations resembling a crystal lattice....
Wigner Crystallization in mesoscopic 2D electron systems (2000)
Filinov, A. V., Bonitz, M., Lozovik, Yu. E.
Wigner crystallization of electrons in a 2D quantum dots is reported. It proceeds in two stages: I) via radial ordering of electrons on shells and II) freezing of the inter-shell rotation. The phase...
"Shaking" of an atom in a non-stationary cavity (2000)
Fedotov, A. M., Narozhny, N. B., Lozovik, Yu. E.
We consider an atom interacting with a quantized electromagnetic field inside a cavity with variable parameters. The atom in the ground state located in the initially empty cavity can be excited by...
Controlling of exciton condensate by external fields and phonon laser (2000)
Lozovik, Yu. E., Ovchinnikov, I. V.
The novel method of observation and controlling of Bose-Einstein condensation in the system of spatially and momentum-space indirect excitons in coupled quantum wells using in-plane magnetic and...
The Excitation Spectra and Superfluidity of the (2000)
Introduction The systems of spatially separated electrons (e) and holes (h) in coupled quantum wells (CQW) attracted the experimental interest [1 to 4] mainly in connection with the superfluidity...
From spatially indirect to momentum-space indirect exciton by in-plane magnetic field (1999)
Butov, L. V., Mintsev, A. V., Lozovik, Yu. E., Campman, K. L., Gossard, A. C.
In-plane magnetic field is found to change drastically the photoluminescence spectra and kinetics of interwell excitons in GaAs/AlGaAs coupled quantum wells. The effect is due to the in-plane...
A new method for detection of exciton Bose condensation using stimulated two-photon emission (1999)
Lozovik, Yu. E., Poushnov, A. V.
Stimulated two-photon emission by Bose-condensed excitons accompanied by a coherent two-exciton recombination, i.e., by simultaneous recombination of two excitons with opposite momenta leaving...
Properties of two - dimensional dusty plasma clusters (1999)
Astrakharchik, G. E., Belousov, A. I., Lozovik, Yu. E.
Two-dimensional classical cluster of particles interacting through a screened Coulomb potential is studied. This system can be used as a model for "dusty particles" in high-frequency discharge...
Quantum orientational melting of mesoscopic clusters (1999)
Belousov, A. I., Lozovik, Yu. E.
By path integral Monte Carlo simulations we study the phase diagram of two - dimensional mesoscopic clusters formed by electrons in a semiconductor quantum dot or by indirect magnetoexcitons in...
Lozovik, Yu. E., Berman, O. L., Tsvetus, V. G.
Superfluidity of spatially separated electrons and holes and unbalanced two-layer electron system in high magnetic field is considered. The temperature of the Kosterlitz-Thouless transition to a...
Superfluidity of indirect excitons in a quantum dot (1998)
Lozovik, Yu. E., Verzakov, S. A., Willander, M.
The superfluidity and Bose-Einstein condensation of indirect excitons in two-dimensional quantum dot are studied by path-integral Monte Carlo simulations. The temperature dependence of superfluid and...
Phase diagram of 2D array of mesoscopic granules (1998)
Belousov, A. I., Verzakov, S. A., Lozovik, Yu. E.
A lattice boson model is used to study ordering phenomena in regular 2D array of superconductive mesoscopic granules, Josephson junctions or pores filled with a superfluid helium. Phase diagram of...
Belousov, A. I., Verzakov, S. A., Lozovik, Yu. E.
The phase diagram of a two-dimensional Josephson array of mesoscopic objects is examined. Quantum fluctuations in both the modulus and phase of the superconducting order parameter are taken into...
Mesoscopic and microscopic dipole clusters: Structure and phase transitions (1998)
Belousov, A. I., Lozovik, Yu. E.
Two dimensional (2D) classical system of dipole particles confined by a quadratic potential is studied. For clusters of N < 81 particles ground state configurations and appropriate eigenfrequencies...
Theory, Simulation and Nanotechnological Applications of Adsorption on a Surface with Defects (1998)
Theory of adsorption on a surface with nanolocal defects is proposed. Two efficacy parameters of surface modification for nanotechnological purposes are introduced, where the modification is a...
Transport of magnetoexcitons in single and coupled quantum wells (1998)
Lozovik, Yu. E., Ruvinsky, A. M.
The transport relaxation time $\tau (P)$ and the mean free path of magnetoexcitons in single and coupled quantum wells are calculated ($P$ is the magnetic momentum of the magnetoexciton). We present...
New model for system of mesoscopic Josephson contacts (1998)
Belousov, A. I., Lozovik, Yu. E.
Quantum fluctuations of the phases of the order parameter in 2D arrays of mesoscopic Josephson junctions and their effect on the destruction of superconductivity in the system are investigated by...
Lozovik, Yu. E., Poushnov, A. V.
The unusual two-photon emission by Bose-condensed excitons caused by simultaneous recombination of two excitons with opposite momenta leaving the occupation numbers of excitonic states with momenta...
Topological phase transition in 2D quantum Josephson array (1998)
Belousov, A. I., Lozovik, Yu. E.
Path Integral Quantum Monte Carlo simulation is used to study thermodynamic properties and a phase diagram of 2D quantum Josephson array, described by 2+1 XY model. The helicity and vorticity moduli,...