Binding Energy of Charged Excitons in ZnSe-based Quantum Wells

Excitons and charged excitons (trions) are investigated in ZnSe-based quantum well structures with (Zn,Be,Mg)Se and (Zn,Mg)(S,Se) barriers by means of magneto-optical spectroscopy. Binding energies of negatively () and positively (X+) charged excitons are measured as functions of quantum well width, free carrier density and in external magnetic fields up to 47 T. The binding energy of shows a strong increase from 1.4 to 8.9 meV with decreasing quantum well width from 190 to 29 A. The binding energies of X+ are about 25% smaller than the binding energy in the same structures. The magnetic field behavior of and X+ binding energies differ qualitatively. With growing magnetic field strength, increases its binding energy by 35-150%, while for X+ it decreases by 25%. Zeeman spin splittings and oscillator strengths of excitons and trions are measured and discussed

Entrepreneurship in family vs. non-family firms: A resource-based analysis of the effect of organizational culture

This study examines the association between four dimensions of organizational culture in family vs. non-family businesses and entrepreneurship. Using data from 536 U.S. manufacturing companies, the results show a nonlinear association between the cultural dimension of individualism and entrepreneurship. Further, there are positive linear relationships between entrepreneurship and an external orientation, an organizational cultural orientation toward decentralization, and a long- versus short-term orientation. With the exception of an external orientation, each of these dimensions is significantly more influential upon entrepreneurship in family firms when compared with non-family firms