Dátum

Előadó: Csonka Szabolcs (BME TTK Fizika Tanszék)

Előadás címe: "Topologically protected ground state degeneracies in a two-spin system"

Időpont: 2017. október 3.  kedd de. 10:00 óra

Helyszín: MTA Wigner FK I.ép. Tanácsterem

 

Kivonat:

Semiconductor nanowires became one of the most intensively studied systems in quantum
electronics in the last few years. With properly designed gate electrodes artificial atoms (quantum
dots) can be created in these nanowires. These can trap electrons which can store quantum
information due to their spin. In this work the ground state of double quantum dot is studied in
external magnetic field by inelastic co-tunnelling spectroscopy. The microscopic description of the
system is complex due to the presence of strong spin-orbit interaction, spin-dependent tunneling and
anisotropic Zeeman effect. At the same time, by using topological considerations we proved that such
magnetic field exists at which the ground state is degenerate and our measurements verified it.