Filtyp
In the thesis, three-dimensionally confined resonant tunneling structures were studied experimentally. Two approaches were used for obtaining quantum confinement: gate-defined lateral constriction of double barrier structures, and epitaxial growth of self-assembled quantum dots. In addition, the thesis deals with the basic development of large-area double barrier resonant tunneling diodes, as a st
26 mars 2026 15:00 till 16:00 | How can archives, personal testimony and research help us understand and remember the atrocities of Nazi persecution? This concluding roundtable brings together the speakers from the University Library’s Ravensbrück lecture series for a shared conversation. This roundtable discussion marks the conclusion of the University Library’s lecture series on the Ravensbrück
https://www.lu.se/evenemang/ravensbruck-dialogue-roundtable-archives-testimony-and-memory - 2026-07-16
The rotation of a quantum liquid induces vortices to carry angular momentum. When the system is composed of multiple components that are distinguishable from each other, vortex cores in one component may be filled by particles of the other component, and coreless vortices form. Based on evidence from computational methods, here we show that the formation of coreless vortices occurs very similarly
The impact of coherence on the nonlinear optical response and stationary transport is studied in quantum cascade laser structures. Nonequilibrium effects such as the pump-probe signals, the spatiotemporally resolved electron density evolution, and the subband population dynamics (Rabi flopping) as well as the stationary current characteristics are investigated within a microscopic density-matrix a
https://www.lu.se/evenemang/ai-industrial-design-20 - 2026-07-16
5 november 2025 09:30 till 12:00 | Welcome to a two-hour symposium to discuss recent developments and historical perspectives on human rights and environmental politics together with civil society actors and scholars in the Lund University’s Human Rights Profile Area. This event will focus on recent backlashes against human rights and environmental politics and explore the underlying reasons for i
https://www.lu.se/evenemang/human-rights-and-environmental-politics-recent-developments-and-historical-perspectives - 2026-07-16
In this thesis we focus on improvements of the description of the electron-electron correlation effects in nonequilibrium nanosystems. We mainly focus on developments of two nonequilibrium methods, namely the formalism of Nonequilibrium Green’s Function and Time Dependent Density Functional Theory and we explore the possibility to improve existing approximations in these theories. A smaller part o
We study the transient dynamics subject to quantum coherence effects of two interacting parallel quantum dots weakly coupled to macroscopic leads. The stationary particle current of this quantum system is sensitive to perturbations much smaller than any other energy scale, specifically compared to the system-lead coupling and the temperature. We show that this is due to the presence of a parity-li
Popular Abstract in Swedish I denna avhandling studeras egenskaper hos tvådimensionella, kvantmekaniska mångpartikelsystem. Studierna utförs med spinndensitetsfunktionalteori (SDFT) med den lokala spinndensitetsapproximationen (LSDA), samt med numerisk exakt diagonalisering. De egenskaper som studeras inkluderar symmetribrytande tillstånd i kvantprickar med få elektroner, gap i inneslutna fåpartik
High-order Harmonic Generation (HHG) is a highly non-linear process in which an atom interacts with a strong laser field. The laser field lowers the atomic potential barrier allowing bound electrons to escape into the continuum through tunnel ionization, propagate, and, with some probability, recombine with the parent ion. As a result, coherent eXtreme UltraViolet (XUV) radiation is emitted in the
The electronic properties of quantum dot (QD) arrays are strongly influenced by the Coulomb interaction of electrons within the dot as well as with those in neighbouring dots. In this paper, we investigate this behaviour taking into account screening by a free electron gas in the vicinity of the QDs. We find pronounced effects for standard capacitance - voltage ( CV) measurements of QD structures
In the present study, entropy generation in rectangular cavities with the same area but different aspect ratios is numerically investigated. The vertical walls of the cavities are at different constant temperatures while the horizontal walls are adiabatic. Heat transfer between vertical walls occurs by laminar natural convection. Based on the obtained dimensionless velocity and temperature values,
