We exposed only one patent, but the members of the program group reported three patents in the previous year .The invention refers to an ultrafast quench based nonvolatile bistable device, which changes its physical properties after exposure to a temporally short external perturbation by laser or electrical pulse. This change can be detected as change of optical properties of the material or electrical resistance. The properties can be reverted back to their original state by the application of a heating pulse.
F.32 International patent
COBISS.SI-ID: 29118759Co-organization of scientific meeting; The scope of the meeting is to focus on new approaches to theory of ultrafast phenomena in correlated electronic systems as well as related experimental observation. This covers fundamental problems of hot carrier relaxation in strange metals, collective phenomena and quasi-particle relaxation in superconductors, charge and spin density way systems, excitonic and Mott insulators and related materials.
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 29106983The study of phase transitions in real time under nonequilibrium conditions is of fundamental interest in many areas of physics. A special category of recent fundamental and practical interest is transitions to metastable hidden states that occur under conditions of particle-hole asymmetry. While such behavior has been invoked in cosmology to explain Baryogenesis, it is not commonly observed elsewhere. In the quasi-two-dimensional dichalcogenide, 1T-TaS2, conditions for the formation of an electronically textured hidden "false vacuum" state are created by femtosecond laser photoexcitation. Femtosecond photoexcited low-temperature scanning tunneling microscopy reveals a remarkable quantum duality of polaron behavior with a vivid real-space illustration of Mott physics. The current system is of practical interest for ultrafast low-energy low-temperature nonvolatile memory devices with applications in cryogenic computing.
B.04 Guest lecture
COBISS.SI-ID: 29981479Optical communication requires the translation of an electronic into an optical signal in an electromodulator. Contrary to the miniaturization of most electronic components, electromodulators are still relatively bulky. Our research has shown that the two-dimensional semiconductor MoS2 shows an exceptionally strong electroabsorption signal, which bears the scope for extremely compact, ultrafast, and energy-efficient electromodulators for integrated photonics. We have filed a UK patent application (GB 1600549.8) for the proposed electromodulator device.
F.32 International patent
COBISS.SI-ID: 30059559Ferromagnetism and superconductivity are antagonistic phenomena. Their coexistence implies either a modulated ferromagnetic order parameter on a lengthscale shorter than the superconducting coherence length or a weak exchange coupling between the itinerant superconducting electrons and the localized ordered spins. In some iron based pnictide superconductors the coexistence of ferromagnetism and superconductivity has been clearly demonstrated. The nature of the coexistence, however, remains elusive since no clear understanding of the spin structure in the superconducting state has been reached and the reports on the coupling strength are controversial. We showed in Eu(As,P)2Fe2, by a direct optical pump-probe experiment, that the coupling is weak, since the transfer of the excess energy from the itinerant electrons to ordered localized spins is much slower than the electron-phonon relaxation, implying the coexistence without the short-lengthscale ferromagnetic order parameter modulation. Remarkably, the polarization analysis of the coherently excited spin wave response points towards a simple ferromagnetic ordering of spins with two distinct types of ferromagnetic domains
B.04 Guest lecture
COBISS.SI-ID: 29681703