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Dive into the research topics where Dmitry Mozyrsky is active.

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Featured researches published by Dmitry Mozyrsky.


Physical Review Letters | 2002

Quantum-classical transition induced by electrical measurement.

Dmitry Mozyrsky; Ivar Martin

A model of an electrical point contact coupled to a mechanical system (oscillator) is studied to simulate the dephasing effect of measurement on a quantum system. The problem is solved at zero temperature under conditions of strong non-equilibrium in the measurement apparatus. For linear coupling between the oscillator and tunneling electrons, it is found that the oscillator dynamics becomes damped, with the effective temperature determined by the voltage drop across the junction. It is demonstrated that both the quantum heating and the quantum damping of the oscillator manifest themselves in the current-voltage characteristic of the point contact.


Physical Review Letters | 2003

Relaxation and the Zeno effect in qubit measurements.

S. A. Gurvitz; L. Fedichkin; Dmitry Mozyrsky; Gennady P. Berman

We consider a qubit interacting with its environment and continuously monitored by a detector represented by a point contact. Bloch-type equations describing the entire system of the qubit, the environment, and the detector are derived. Using these equations we evaluate the detector current and its noise spectrum in terms of the decoherence and relaxation rates of the qubit. Simple expressions are obtained that show how these quantities can be accurately measured. We demonstrate that due to interaction with the environment, the measurement can never localize a qubit even for infinite decoherence rate.


Physical Review B | 2002

Interference effects in resonant magnetotransport

Dmitry Mozyrsky; L. Fedichkin; S. A. Gurvitz; Gennady P. Berman

We study nonequilibrium magnetotransport through a single-electron transistor or an impurity. We find that due to spin-flip transitions, generated by the spin-orbit interaction, the spectral density of the tunneling current fluctuations develops a distinct peak at the frequency of Zeeman splitting. This mechanism explains modulation in the tunneling current at the Larmor frequency observed in scanning tunneling microscope experiments and can be utilized as a detector for single spin measurement.


Nature Communications | 2013

Semiclassical Monte-Carlo approach for modelling non-adiabatic dynamics in extended molecules

Vyacheslav N. Gorshkov; Sergei Tretiak; Dmitry Mozyrsky

Modelling of non-adiabatic dynamics in extended molecular systems and solids is a next frontier of atomistic electronic structure theory. The underlying numerical algorithms should operate only with a few quantities (that can be efficiently obtained from quantum chemistry), provide a controlled approximation (which can be systematically improved) and capture important phenomena such as branching (multiple products), detailed balance and evolution of electronic coherences. Here we propose a new algorithm based on Monte-Carlo sampling of classical trajectories, which satisfies the above requirements and provides a general framework for existing surface hopping methods for non-adiabatic dynamics simulations. In particular, our algorithm can be viewed as a post-processing technique for analysing numerical results obtained from the conventional surface hopping approaches. Presented numerical tests for several model problems demonstrate efficiency and accuracy of the new method.


Physical Review B | 2009

Thermodynamical stability of odd-frequency superconducting state

Dmitry Solenov; Ivar Martin; Dmitry Mozyrsky

Odd-frequency pairing mechanism has been investigated for several decades. Nevertheless the properties of such superconducting phase as well as its thermodynamic stability have remained unclear. In particular it has been argued by numerous authors that the odd-frequency state is thermodynamically unstable, has an unphysical Meissner effect (at least within the mean-field approximation), and therefore can not exist as a homogeneous phase in equilibrium physical systems. We argue that such a conclusion is incorrect because it relies on an inappropriate assumption that the odd-frequency superconductor can be described by an effective Hamiltonian that breaks the U(l) symmetry. We show that the odd-frequency state can be appropriately formulated within the functional integral representation by using the effective action to describe such a superconducting state within the mean field approximation. We find that the odd-frequency superconductor is thermodynamically stable and exhibits ordinary Meissner effect, and therefore, in principle, it can be realized in equilibrium solid state systems.


Physical Review B | 2005

Coherent effects in magnetotransport through Zeeman-split levels

S. A. Gurvitz; Dmitry Mozyrsky; Gennady P. Berman

We study nonequilibrium electronic transport through a quantum dot or an impurity weakly coupled to ferromagnetic leads. Based on the rate equation formalism we derive the noise spectra for the transport current. We show that, due to quantum interference between different spin components of the current, the spectrum develops peaks or dips at frequencies corresponding to the Zeeman splitting in the quantum dot. A detailed analysis of the spectral structure of the current is carried out for noninteracting electrons as well as for the regime of Coulomb blockade.


Physical Review B | 2002

Time scales of phonon-induced decoherence of semiconductor spin qubits

Dmitry Mozyrsky; Sh. M. Kogan; V. N. Gorshkov; Gennady P. Berman

Decoherence of a shallow donor electron spin in Si and Ge caused by electron-lattice interaction is studied. We find that there are two time scales associated with the evolution of the electron spin density matrix: the fast, but incomplete decay due to the interaction with nonresonant phonons, followed by slow relaxation resulting from spin flips accompanied by resonant phonon emission. We estimate both time scales, as well as the magnitude of the initial drop of coherence for P donor in Si and Ge, and argue that the approach used in the paper is suitable for evaluation of decoherence for a general class of localized spin states in semiconductors.


Journal of Chemical Physics | 2014

Semiclassical Monte Carlo: A first principles approach to non-adiabatic molecular dynamics

Alexander J. White; Vyacheslav N. Gorshkov; Ruixi Wang; Sergei Tretiak; Dmitry Mozyrsky

Modeling the dynamics of photophysical and (photo)chemical reactions in extended molecular systems is a new frontier for quantum chemistry. Many dynamical phenomena, such as intersystem crossing, non-radiative relaxation, and charge and energy transfer, require a non-adiabatic description which incorporate transitions between electronic states. Additionally, these dynamics are often highly sensitive to quantum coherences and interference effects. Several methods exist to simulate non-adiabatic dynamics; however, they are typically either too expensive to be applied to large molecular systems (10s-100s of atoms), or they are based on ad hoc schemes which may include severe approximations due to inconsistencies in classical and quantum mechanics. We present, in detail, an algorithm based on Monte Carlo sampling of the semiclassical time-dependent wavefunction that involves running simple surface hopping dynamics, followed by a post-processing step which adds little cost. The method requires only a few quantities from quantum chemistry calculations, can systematically be improved, and provides excellent agreement with exact quantum mechanical results. Here we show excellent agreement with exact solutions for scattering results of standard test problems. Additionally, we find that convergence of the wavefunction is controlled by complex valued phase factors, the size of the non-adiabatic coupling region, and the choice of sampling function. These results help in determining the range of applicability of the method, and provide a starting point for further improvement.


Journal of Chemical Physics | 2015

Non-adiabatic molecular dynamics by accelerated semiclassical Monte Carlo

Alexander J. White; Vyacheslav Gorshkov; Sergei Tretiak; Dmitry Mozyrsky

Non-adiabatic dynamics, where systems non-radiatively transition between electronic states, plays a crucial role in many photo-physical processes, such as fluorescence, phosphorescence, and photoisomerization. Methods for the simulation of non-adiabatic dynamics are typically either numerically impractical, highly complex, or based on approximations which can result in failure for even simple systems. Recently, the Semiclassical Monte Carlo (SCMC) approach was developed in an attempt to combine the accuracy of rigorous semiclassical methods with the efficiency and simplicity of widely used surface hopping methods. However, while SCMC was found to be more efficient than other semiclassical methods, it is not yet as efficient as is needed to be used for large molecular systems. Here, we have developed two new methods: the accelerated-SCMC and the accelerated-SCMC with re-Gaussianization, which reduce the cost of the SCMC algorithm up to two orders of magnitude for certain systems. In most cases shown here, the new procedures are nearly as efficient as the commonly used surface hopping schemes, with little to no loss of accuracy. This implies that these modified SCMC algorithms will be of practical numerical solutions for simulating non-adiabatic dynamics in realistic molecular systems.


Physical Review Letters | 2012

Chirality Waves in Two-Dimensional Magnets

Dmitry Solenov; Dmitry Mozyrsky; Ivar Martin

We theoretically show that moderate interaction between electrons confined to move in a plane and localized magnetic moments leads to formation of a noncoplanar magnetic state. The state is similar to the Skyrmion crystal recently observed in cubic systems with the Dzyaloshinskii-Moriya interaction; however, it does not require spin-orbit interaction. The noncoplanar magnetism is accompanied by the ground-state electrical and spin currents, generated via the real-space Berry phase mechanism. We examine the stability of the state with respect to lattice discreteness effects and the magnitude of magnetic exchange interaction. The state can be realized in a number of transition metal and magnetic semiconductor systems.

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Ivar Martin

Los Alamos National Laboratory

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Gennady P. Berman

Los Alamos National Laboratory

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Alexander V. Balatsky

Los Alamos National Laboratory

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Sergei Tretiak

Los Alamos National Laboratory

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Jerome Daligault

Los Alamos National Laboratory

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Vyacheslav N. Gorshkov

Los Alamos National Laboratory

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S. A. Gurvitz

Weizmann Institute of Science

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