BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Kinetic instabilities in bidimensional Dirac materials DTSTART:20250627T110000Z DTEND:20250627T130000Z DTSTAMP:20260701T020344Z UID:d4cf2994-b125-407f-855e-5ecff02cbb5a SEQUENCE:1 CREATED:20250623T144047Z DESCRIPTION:Plasmonics in bidimensional materials has proved an active fie ld of study\, with these systems showing potential to be used as future op toelectric devices for a number of high-frequency applications. While the hydrodynamic regime is well studied in literature\, to go beyond the high- wavelength and local equilibrium regime\, a kinetic model is used. To incl ude important quantum corrections to the dynamics of the charge carriers\, this model is derived from the Schrödinger equation via the Wigner qua sidistribution function in a mean field approach. A numerical simulation c ode is developed\, which can simulate kinetic systems with wide generality \, including the effects of quantum statistics\, band structures of differ ent materials\, and arbitrary interparticle interactions. This code is par allelized for use in large\, high-performance simulations. With this model \, with the appropriate approximations\, as a starting point\, as well as the simulations to further study non-linear phenomena\, a number of waves and instabilities are described. In the static-field case\, the frequency and lifetime of plasmons is derived\, and the behaviour of the bidimension al two-stream instability\, which leads to a collisionless anomalous condu ctivity\, is found. We describe the lack of confinement of transverse elec tromagnetic waves in these materials\, but find a related instability whic h spontaneously generates out-of-plane magnetic fields. Finally\, a relate d zero-frequency clustering instability in a system of repulsive particles is shown. LAST-MODIFIED:20250623T144047Z LOCATION:Sala P3 (Piso 1 do Pavilhão de Matemática) do IST/Online URL:http://df.vps.tecnico.ulisboa.pt/en/events/kinetic-instabilities-in-bi dimensional-dirac-materials/ X-ALT-DESC;FMTTYPE=text/html:

Plasmonics in bidim ensional materials has proved an active field of study\, with these system s showing potential to be used as future optoelectric devices for a number of high-frequency applications. While the hydrodynamic regime is well stu died in literature\, to go beyond the high-wavelength and local equilibriu m regime\, a kinetic model is used. To include important quantum correctio ns to the dynamics of the charge carriers\, this model is derived from the Schrödinger equation via the Wigner quasidistribution function in a me an field approach.

A numerical simulation code is developed\, wh ich can simulate kinetic systems with wide generality\, including the effe cts of quantum statistics\, band structures of different materials\, and a rbitrary interparticle interactions. This code is parallelized for use in large\, high-performance simulations. With this model\, with the appropria te approximations\, as a starting point\, as well as the simulations to fu rther study non-linear phenomena\, a number of waves and instabilities are described.

In the static-field case\, the frequency and lifetim e of plasmons is derived\, and the behaviour of the bidimensional two-stre am instability\, which leads to a collisionless anomalous conductivity\, i s found. We describe the lack of confinement of transverse electromagnetic waves in these materials\, but find a related instability which spontaneo usly generates out-of-plane magnetic fields. Finally\, a related zero-freq uency clustering instability in a system of repulsive particles is shown.< /p> END:VEVENT END:VCALENDAR