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Photonic topological insulators and self-induced nonreciprocity based on nonlinear effects in asymmetric structures have garnered increased attention due to their potential applications in quantum information technologies and advanced photonic integrated circuits. In this study, we combine these two fields and present asymmetric photonic crystal designs based on all-dielectric checkerboard structu

We show that the free-carrier absorption in quantum cascade lasers (QCLs) is very small and radically different from the classical Drude result due to the orthogonality between the direction of the carrier free motion and the electric field of the laser emission. A quantum mechanical calculation of the free-carrier absorption and intersubband oblique absorption induced by interface defects, Coulom

Previously recorded data of electron tunneling in and out of a quantum dot (QD) is used to extract knowledge of the state of the system. Using the detailed balance of the system, it is shown that information about the electron temperature in the lead Te, as well as knowledge about the degeneracies of the states in a quantum dot can be obtained from measurements of the tunneling rates in and out of

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 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

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 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

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

https://www.nano.lu.se/research/quantum-physics/transport-physics - 2026-07-13

Eligibility and admissionTo have basic eligibility for third cycle (doctoral) studies, a student must have (1) passed an exam at second cycle (Master’s) level, (2) fulfilled the course requirements for at least 240 higher education credits, of which at least 60 at second cycle level, or (3) acquired equivalent knowledge in some other way.The applicant should have a degree in Gender Studies or in a

https://www.soc.lu.se/en/doctoral-studies/doctoral-studies-gender/application-and-admission - 2026-07-13