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An ab initio quantum-classical mixed scheme for the time evolution of electrode-device-electrode systems is introduced to study nuclear dynamics in quantum transport. Two model systems are discussed to illustrate the method. Our results provide the first example of current-induced molecular desorption as obtained from a full time-dependent approach and suggest the use of ac biases as a way to tail
We present an experimental study of harmonic generation in molecular gases, using the fundamental (800 nm) and the second harmonic (400 nm) of a 150 fs titanium - sapphire laser at an intensity of ##IMG## [http://ej.iop.org/images/0953-4075/29/14/032/img1.gif] . We compare the conversion efficiency and the maximum energy obtained in different species: rare gases (Ar, Xe), diatomic molecules ( ##IM
We analyze femtosecond supercontinuum generation in a distribution of thin solid plates to show that the distributed scheme inhibits processes leading to pulse breakup while allowing spectral expansion to proceed as desired. We introduce basic criteria for setting the plate thickness or initial laser intensity and the location of each plate in the laser beam path and confirm that under these condi
We study the physics of high-temperature cuprate superconductors starting from the highly degenerate four-site plaquette of the t− t′− U Hubbard model as a reference system. The degeneracy causes strong fluctuations when a lattice of plaquettes is constructed. We show that there is a large binding energy between holes when a set of four plaquettes is considered. The next-nearest-neighbour hopping
Isotopic differences in the distribution of nuclear charge and magnetization give rise to "hyperfine structure anomalies" which were observed already in the 1950s. More recently, the distribution of nuclear magnetization has been found to complicate the interpretation of the measured hyperfine splittings in highly charged hydrogen-like ions. In this paper, results of numerical calculations for a f
Popular Abstract in English For several decades the electronic industry has developed towards smaller and smaller electronic components. The idea behind this development is quite simple: Small components have faster response times, which enables faster devices. Also, smaller components make it possible to decrease the size of the devices. A common example is today's mobile phones, that actually arThis dissertation deals with the effects of coherence and correlations on transport through nanostructures. Simulations are mainly performed using the second order von Neumann approach, a method capable of dealing with these effects in the presence of higher order tunneling. We see that such effects can result in various kinds of current suppression as well as efficient thermoelectric devices. Fu
Microsoft Word - SÄRSKILT TILLSTÅND Efternamn, tilltalsnamn/Last name, first name Personnummer / Personal identity number (or date of birth) Bostadsadress/Home address Postnummer, ortnamn, land/Post code, city, country Telefon/Phone number E-postadress/E-mail address Antagen till forskarutbildning vid/Admitted to PhD Programme at Universitet eller högskola/University Land/Country Ansökan avser kur
15 september 2026 19:00 till 20:00 | Konsert With the defence performance “Red Carpet,” the audience will experience an artistic research performance by and featuring Felicita Brusoni, in which voice and body are used to explore the potential of creation and the feminine as a form of expression. A vocal-body composition for an Extended Singer and dancerCreation is one of the most unexpressed possi
https://www.mhm.lu.se/evenemang/final-performance-phd-candidate-artistic-research-felicita-brusoni-voice-beyond-edge - 2026-08-11
Popular Abstract in Swedish Den här avhandlingen beskriver elektrontransport i nanometerstora halvledarstrukturer vid mycket låga temperaturer (1 nanometer = 1 miljondels millimeter). De här strukturerna har helt andra elektriska egenskaper än vanliga ledare. Man ser effekter av enskilda elektroners transport, och av kvantmekaniska fenomen som kvantiserad energi och våginterferens. Området är föreIn this thesis, electron transport in mesoscopic semiconductor nanostructures, in particular so-called electron billiards or quantum dots, is studied. The thesis can be divided into two areas: the linear response regime of transport, and the nonlinear response regime of transport. The classical and quantum mechanical electron dynamics are studied for triangular and square-shaped electron billiard
We study the stability and structure of vortices emerging in two-dimensional quantum dots in high magnetic fields. Our results obtained with exact diagonalization and density-functional calculations show that vortex structures can be found in various confining potentials. In nonsymmetric external potentials we find off-electron vortices that are localized giving rise to charge deficiency or holes
Language has to be conceived wholistically. Fragmented views, provoked by attempts at describing language, turn out essentially distortive on the general phenomenon which language is, with species like genetic language, programming language, formal language, observation language, inner cerebral language, external communication language. At the center of this wholism is a linguistic complementarity
