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23, 987 (1993). [12] H. Paul and M. Paviˇci´c, Resonance interaction-free measurement, Int. J. Theor. Phys. 35, 2085 (1996). 43 44 Bibliography [13] M. Paviˇci´c, Resonance energy-exchange-free detection and ”welcher Weg” experiment, Phys. Lett. A 223, 241 (1996). [14] S. Datta, Quantum devices, Superlattices and Microstructures 6, 83 (1989). [15] C. M. Wolfe, N. Holonyak, and G. E. Stillman, Physical Properties of Semiconductors (Prentice-Hall, 1989). [16] M. B¨ uttiker, Four-Terminal Phase-Coherent Conductance Phys.

The main point being that injecting electrons by means of an electron waveguide coupled to a quantum wire/box, the electrons could be injected directly into the exited state, circumventing time-consuming relaxation processes. The concept was studied on a quantum wire far IR laser. The paper is a proof-of-concept that by using coherent electron transport for carrier injection in low-dimensional lasers, injection directly into the exited state is possible. Contributions of the author of the thesis: Development of concept together with co-authors, all computer simulations of the carrier injection as well as calculations of threshold current densities and modulation bandwidth of the quantum wire far IR laser.

Here these two methods are described in a general fashion, omitting details such as discretization and most questions regarding the actual implementation of the methods in the form a computer program. First we discuss how to calculate the time-evolution of a quantum system by use of split-operator methods, and then a self-consistent method to calculate the potential and charge density distribution of mesoscopic devices is described. Self-consistent simulation methods for quantum systems are common, however this method, which is described in detail in Paper F, takes into account the possibility to apply a finite bias to the device by using an energy-resolved charge density distribution calculation, which to my knowledge is unique.

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