Regensburg 2022 – wissenschaftliches Programm
PLV I: Plenarvortrag
Montag, 5. September 2022, 08:30–09:15, H1
Intrinsic Josephson junctions in Bi2Sr2CaCu2O8: Generation of Terahertz radiation and beyond — •Reinhold Kleiner — Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen
The layered superconductor Bi2Sr2CaCu2O8(BSCCO) is known to intrinsically form a stack of Josephson tunnel junctions (IJJs). Each junction is formed by adjacent superconducting CuO2 layers and the insulating BiO and SrO layers in between. Due to the fact that the BiO layers are coupled by van der Waals forces, stacks of consisting of only a few IJJs up to several thousands of IJJs can be created by using exfoliation methods combined with lithography. After an initial phase of investigations on small-sized stacks, in recent years the focus was on the generation of terahertz (THz) radiation, making use of stacks consisting of a large number of IJJs. The stacks mainly radiate in the frequency range between 0.5 THz and 2 THz, which inside the so-called THz gap. Beyond THz generation BSCCO received attention in the context of 2D materials and it was also shown recently that IJJ stacks can host electromagnetic modes acting as a discrete classical space-time crystal, developing periodic order both in space and time. In the talk, after some introduction, I will present the recent status on the field of THz generation. I will then turn to the possible realization of a discrete space-time crystal based on BSCCO IJJ stacks.