Seminar - "Topologically protected ground state degeneracies in a two-spin system"

  "Topologically protected ground state degeneracies in a two-spin system" by Szabolcs Csonka (BME TTK)

Tuesday, October 3th, 2017 from 10:00 to 11:00 (Europe/Budapest) 
at KFKI campus ( Bldg.1. Meeting Room )

 

Extract:

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.