ELFT HÍRADÓ

[Balazs Dora <dora.balazs AT ttk.bme.hu>]

                      MEGHÍVÓ








    a Szilárd Leó-Kollokvium előadására:


                   Wolfgang Belzig
           (University of Konstanz)





“Topology in multi-terminal superconducting structures"



Kivonat: Topology ultimately unveils the roots of the perfect 
quantization observed in complex systems. The quantum Hall effect is the 
celebrated archetype of a two-dimensional topological invariant. 
Remarkably, topology can manifest itself even in systems defined by 
control parameters playing the role of synthetic dimensions. Despite the 
practical importance of quantized responses, non-trivial topology is a 
fascinating example of a hidden system property that cannot be accessed 
by local measurements alone.

In this colloquium, I introduce superconducting multi-terminal 
structures as a platform to investigate a host of topological phenomena 
that can be experimentally implemented in taylored nanostructured 
devices. Such systems can realize an Andreev bound state spectrum 
displaying a stable so-called Weyl singularity that not only shows a 
quantized response but can be detected spectroscopically. First 
experimental hints for such topological Andreev bands have recently been 
found. The large variability of this devices allows to go beyond more 
traditional topologies. On one hand, is the number of synthetic 
dimensions not limited to the three spatial directions and allow to 
simulate exotic higher-dimensional systems. On the other hand, adding 
non-superconducting parts can implement non-Hermitian physics that 
realizes yet another topological structure with unique physical properties.



Helye: BME Fizikai Intézet, Fizika Tanszék
Budafoki út 8. F-épület, 2. emelet, 13-as terem


Ideje: 2025. április 1. (kedd), 14:30.
Kapunyitás 14:14-től.
Program: http://physics.bme.hu/kollokvium


Minden érdeklődőt örömmel várunk!




Dóra Balázs és Zaránd Gergely