Introduction

Wstęp do Acta Universitatis Lodziensis. Folia Oeconomica nr 59Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej naukę

Hole Transport in Impurity Band and Valence Bands Studied in Moderately Doped GaAs:Mn Single Crystals

We report on simple experiment on temperature-dependent Hall effect measurements in GaMnAs single crystalline samples with Mn composition estimated at 0.05-0.3 at.% which is slightly below the onset of ferromagnetism. Impurity band transport is visible for Mn compositions of ~0.3 at.% as a clear metallic behaviour. The results show interesting situation that the Metal-Insulator transition in GaAs:Mn occurs within the impurity band which is separated from the valence bands for Mn concentrations studied here. We also discuss on the equilibrium high temperature solubility limit of Mn in GaAs, unknown precisely in the literature.Comment: 9 pages, 2 figures, Proc. of 35th International School on the Physics of Semiconducting Compounds, Jaszowiec 2007, Poland, to appear in Acta Physica Polonica A (2007

Surmounting obstacles in Hartford: first person with Luis C. Caban

The executive director of the Southside Institutions Neighborhood Alliance talks about how this organization is turning around distressed neighborhoods in south Hartford, Connecticut.Community development - Connecticut

Relativistic Einstein-Podolsky-Rosen correlations for vector and tensor states

We calculate and investigate the relativistic correlation function for bipartite systems of spin-1/2 in vector and spin-1 particles in tensor states. We show that the relativistic correlation function, which depends on particles momenta, may have local extrema. What is more, the momentum dependance of the correlation functions for two choices of relativistic spin operator may be significantly different.Comment: 7 pages, 7 figure

Pięć lat „Kwartalnika Romskiego”

Czasopismo współfinansowane ze środków Wydziału Nauk Geograficznych Uniwersytetu Łódzkiego