Control of a single-particle localization in open quantum systems

We investigate the possibility to control localization properties of the asymptotic state of an open quantum system with a tunable synthetic dissipation. The control mechanism relies on the matching between properties of dissipative operators, acting on neighboring sites and specified by a single control parameter, and the spatial phase structure of eigenstates of the system Hamiltonian. As a result, the latter coincide (or near coincide) with the dark states of the operators. In a disorder-free Hamiltonian with a flat band, one can either obtain a localized asymptotic state or populate whole flat and/or dispersive bands, depending on the value of the control parameter. In a disordered Anderson system, the asymptotic state can be localized anywhere in the spectrum of the Hamiltonian. The dissipative control is robust with respect to an additional local dephasing.Comment: 6 pages, 5 figure

Localization in open quantum systems

In an isolated single-particle quantum system a spatial disorder can induce Anderson localization. Being a result of interference, this phenomenon is expected to be fragile in the face of dissipation. Here we show that dissipation can drive a disordered system into a steady state with tunable localization properties. This can be achieved with a set of identical dissipative operators, each one acting non-trivially only on a pair of neighboring sites. Operators are parametrized by a uniform phase, which controls selection of Anderson modes contributing to the state. On the microscopic level, quantum trajectories of a system in a localized steady regime exhibit intermittent dynamics consisting of long-time sticking events near selected modes interrupted by jumps between them.Comment: 5 pages, 5 figure

Localization in periodically modulated speckle potentials

Disorder in a 1D quantum lattice induces Anderson localization of the eigenstates and drastically alters transport properties of the lattice. In the original Anderson model, the addition of a periodic driving increases, in a certain range of the driving's frequency and amplitude, localization length of the appearing Floquet eigenstates. We go beyond the uncorrelated disorder case and address the experimentally relevant situation when spatial correlations are present in the lattice potential. Their presence induces the creation of an effective mobility edge in the energy spectrum of the system. We find that a slow driving leads to resonant hybridization of the Floquet states, by increasing both the participation numbers and effective widths of the states in the strongly localized band and decreasing values of these characteristics for the states in the quasi-extended band. Strong driving homogenizes the bands, so that the Floquet states loose compactness and tend to be spatially smeared. In the basis of the stationary Hamiltonian, these states retain localization in terms of participation number but become de-localized and spectrum-wide in term of their effective widths. Signatures of thermalization are also observed.Comment: 6 pages, 3 figure

Addressing the needs of international students: a case from a russian university

Introduction The study addresses the needs of university educators in alternative, more efficient teaching techniques supported by the psychological approach.Method The introduced method of fairy tale writing, based on the potential of Russian traditional fairy tales, encourages critical thinking, and enhances the problem solving process in the context of international students’ identification with an imaginary personality. The defense mechanisms unconsciously applied in the frame of an individual’s narration assist in interpreting their emotional state and psychological adaptation levels at a certain point in time.Results The complexity of the adjustment process should be scrupulously considered, as the nature of individually applied defense mechanisms is dependent on the culture and contextually relevant. Fairy tale therapy gives international students a chance to negotiate identity in writing and acquire positive feelings of attachment and belonging. Instructors benefit from “hearing out” and learning about the students who, in the traditional educational setting, would reveal shyness associated with some cultural predisposition (China, Japan, and Korea).Discussion The timely changed class instruction style and more person-centered approach can modify the situational adaptation outcomes, and long-duration observation can provide aclearer picture of identity transition. Arrangements should be made to adequately shift emotional discontent at the critical point, and this is a task for both the local university administration and the national legislative body. The theoretical prerequisite of universalism of human emotions enables the educators to perceive the coded message in the narrators’ ‘voices’ and become mediators between international students and university administration.Keywords: defense mechanisms, emotional state, psychological adaptation, Russian fairy tales, universal semantic primitive

Formation of the oxide coating on the titanium surface by multipulse femtosecond laser irradiation

The effect of the femtosecond laser irradiation on the formation of oxide layers on the surface of a commercially pure titanium VT1-0 was studied. The methods of X-ray analysis, scanning electron and transmission electron microscopies were used to study the structural and phase state of oxide layers. As a result of the femtosecond laser irradiation, the porous multi-phase nanocrystalline oxide coating with a thickness of 50 µm is formed on the titanium surfac

The formation of oxide layers on a titanium surface by irradiation with femtosecond laser pulses

By subjecting technical grade titanium to irradiation with femtosecond laser pulses with highenergy density, we create a microporous nanocrystalline oxide layer with a thickness of ∼50 μm on its surface. The structure and phase composition of the modified surface layers are studied using X-ray diffraction and high-resolution scanning and transmission electron microscopie

Formation of personality pathology in servicemen participating in local warfare and military conflicts at time of peace

Studies of the specifics of conditions and mechanisms of formation of personality pathology in servicemen participating in local warfare and military conflicts at the time of peace are based on the material of modern transformations of traditional military discourse, social psychological and personality estimations of “victory" and "defeat" in military campaigns. In particular, a pathological loss of temporal perspective and real time, psychotization of behavior in personal and family relations can be assessed as manifestation of personality pathology of Afghanistan and Chechnya veterans whose terms of service ended from 10 to 20 years ago.На материале современных трансформаций традиционного военного дискурса, социально-психологической и личностной оценки «победы» и «поражения» в военных кампаниях, исследуется специфика условий и механизмы формирования личностной патологии у военнослужащих, участвующих в локальных войнах и боевых конфликтах в мирное время. В частности, выявлена патологическая утрата временной перспективы и реального времени, психотизация поведения в межличностных коммуникациях и в семье, которые можно расценивать как проявление личностной патологии у ветеранов Афганистана и Чечни, закончивших службу в армии 10-20 лет назад

Psychotherapy in the correction of psychological problems of parents of children with disabilities

The purpose of the study is to identify the psychological problems of families of children with disabilities (children with speech disorders), to develop and test a program for their correction by the method of psychotherapy.Цель исследования – выявить психологические проблемы семей детей с ОВЗ (дети с нарушениями речи), разработать и апробировать программу их коррекции путем метода психотерапии

Determination of mental nervous-psyhic tension and internet addiction: on the example of pupils of the first year

This article presents a pilot study of the determination of neuro psychic tension and Internet addiction among students of first-year studentsВ данной статье представлено пилотное исследование детерминированности нервно-психической напряженности и интернет зависисмости у студентов-первокурсников

МЕЖДИСЦИПЛИНАРНАЯ КОНФЕРЕНЦИЯ ПО ИЗУЧЕНИЮ БЕДНОСТИ В УНИВЕРСИТЕТЕ ЗАЛЬЦБУРГА

The article is devoted to the International scientific conference in interdisciplinary poverty research held at the University of Salzburg. The focus theme of the Conference was the study of the relationship between the problem of poverty and religion.Материал посвящен международной научной конференции по междисциплинарным исследованиям бедности, состоявшейся в Университете Зальцбурга. Главной темой конференции стало изучение взаимосвязи проблемы бедности и религии