ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT ttk.bme.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

szept. 29. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Aritra Sen (BME Elm. Fiz. tanszék):
Classification and magic magnetic-field directions for spin-orbit-coupled
double quantum dots

The spin of a single electron confined in a semiconductor quantum dot is a
natural qubit candidate. Fundamental building blocks of spin-based quantum
computing have been demonstrated in double quantum dots with significant
spin-orbit coupling. Here [1], we show that spin-orbit-coupled double
quantum dots can be categorised in six classes, according to a partitioning
of the multi-dimensional space of their g-tensors. The class determines
physical characteristics of the double dot, i.e., features in transport,
spectroscopy and coherence measurements, as well as qubit control,
shuttling, and readout experiments. In particular, we predict that the spin
physics is highly simplified due to pseudospin conservation, whenever the
external magnetic field is pointing to special directions (`magic
directions'), where the number of special directions is determined by the
class. We also analyze the existence and relevance of magic loops in the
space of magnetic-field directions, corresponding to equal local Zeeman
splittings. These results present an important step toward precise
interpretation and efficient design of spin-based quantum computing
experiments in materials with strong spin-orbit coupling.


[1]: A Sen, Gy Frank, B Kolok, J Danon, A Pályi,  arXiv:2307.02958 (2023)

Minden érdeklődőt szeretettel várunk.
Asbóth János,
 szemináriumi koordinátor