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Avdelningen för matematisk fysik är gemensam för naturvetenskaplig och tekniska (LTH) fakulteterna och är en del av fysiska institutionen. Forskningen bedrivs främst inom området kvantmekanisk mångpartikelfysik, vilket innefattar teoretisk kärnstrukturfysik, nanometerfysik, tidsberoende och icke-jämviktsfenomen, kvantinformation, atom-teori och materialmodellering, med flera samarbeten både intern

A fundamental postulate of quantum mechanics is that the Hamiltonian of a closed system is Hermitian, guaranteeing real-valued energies and conserved probabilities throughout the evolution of the system. However, for quantum systems where there is dissipation and crosstalk with the environment, such as a system of quantum dots connected to an environment of metallic leads, the dynamics of the syst

Using Burt's envelope function theory and the scattering matrix method, we investigate the hybridized electron-hole Landau levels in strained InAs/GaSb quantum wells sandwiched between wide-gap AlSb barrier layers under electric and a quantizing magnetic fields applied perpendicular to interfaces. At zero magnetic field, in the structures studied here, the lowest electron level in the InAs layer l

Converting information into work has, during the past decade, gained renewed interest as it gives insight into the relation between information theory and thermodynamics. Here, we theoretically investigate an implementation of Maxwell's demon in a double quantum dot and demonstrate how heat can be converted into work using only information. This is accomplished by continuously monitoring the charg

Independence and collaboration both play crucial roles in PhD students’ research practice and in their socialization into the PhD role. This study examines how theexpectation of PhD students' academic independence intersects with the need for more collaborative engagements within research groups. Drawing on interviews with supervisors and an analysis of co-authorship patterns in PhD studentdissert

The interplay of electronic and nuclear degrees of freedom presents an outstanding problem in condensed matter physics and chemistry. Computational challenges arise especially for large systems, long time scales, in nonequilibrium, or in systems with strong correlations. In this work, we show how downfolding approaches facilitate complexity reduction on the electronic side and thereby boost the si

In this article we consider how the operator of an electric power system should activate bids on the regulating power market in order to minimize the expected operation cost. Important characteristics of the problem are reaction times of actors on the regulating market and ramp-rates for production changes in power plants. Neglecting these will in general lead to major underestimation of the opera

One of the basic requirements of today's sophisticated world is the availability of electrical energy, and neglect of this matter may have irreparable damages such as an extensive blackout. The problems which were introduced about the traditional power grid, and also, the growing advances in smart technologies make the traditional power grid go towards smart power grid. Although widespread utilisa

UTF-8Strategy 2025-2027 final Strategy of the Centre for East and South-East Asian Studies 2025- 2027 At a time of increasing political polarizations and global challenges, such as climate change and geo-political tensions and wars, there is an urgent need to deepen the knowledge of East and South-East Asian societies at Lund University. The region is of great interest in and of itself due to its

https://www.ace.lu.se/sites/ace.lu.se/files/2025-04/ACE%20Strategy%202025-2027.pdf - 2026-07-18

UTF-8UTF-8Strategy 2025-2027 final NL Strategy of the Centre for East and South-East Asian Studies 2025-2027 At a time of increasing political polarizations and global challenges, such as climate change and geo-political tensions and wars, there is an urgent need to deepen knowledge about East and Southeast Asian societies at Lund University, in Sweden, and more broadly in Europe. The region is of

https://www.ace.lu.se/sites/ace.lu.se/files/2025-04/ACE%20Strategy%202025-2027%20final.pdf - 2026-07-18

Second harmonic generation is popular due to its numerous applications in different technologies dealing with multiple fields of science. The rapid technical advancement with the second harmonic generation demands parallel development in the theoretical understanding. With this view in mind, in our three papers, we theoretically investigated second harmonic generation from different systems in an

In this paper we studied carrier drift dynamics in APFO3:PC61BM solar cells of varied stoichiometry (2:1, 1:1, and 1:4 APFO3:PC61BM) over a wide time range, from subpicoseconds to microseconds with a combination of ultrafast optical electric field probing and conventional transient integrated photocurrent techniques. Carrier drift and extraction dynamics are strongly stoichiometry dependent: the s

III-V nanowires (NWs) are promising for a wide range of applications, ranging from optics to electronics, energy, and biological sensing. The structural quality of NWs is of paramount importance for the performance of such future NW-based devices. Random structural defects and polytypism occur naturally in semiconductor NWs, but progress both on the theoretical understanding and experimental contr