Open AccessEffects of Parity and Symmetry on the Aharonov–Bohm Phase of a Quantum Ring
Author(s) -
Rousan Debbarma,
Heidi Potts,
Calle Janlén Stenberg,
Athanasios Tsintzis,
Sebastian Lehmann,
Kimberly A. Dick,
Martin Leijnse,
Claes Thelander
Publication year - 2021
Publication title -
nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.853
H-Index - 488
eISSN - 1530-6992
pISSN - 1530-6984
DOI - 10.1021/acs.nanolett.1c03882
Subject(s) - physics , parity (physics) , condensed matter physics , quantum , symmetry (geometry) , quantum mechanics , quantum dot , wave function , geometry , mathematics
We experimentally investigate the properties of one-dimensional quantum rings that form near the surface of nanowire quantum dots. In agreement with theoretical predictions, we observe the appearance of forbidden gaps in the evolution of states in a magnetic field as the symmetry of a quantum ring is reduced. For a twofold symmetry, our experiments confirm that orbital states are grouped pairwise. Here, a π-phase shift can be introduced in the Aharonov-Bohm relation by controlling the relative orbital parity using an electric field. Studying rings with higher symmetry, we note exceptionally large orbital contributions to the effective g-factor (up to 300), which are many times higher than those previously reported. These findings show that the properties of a phase-coherent system can be significantly altered by the nanostructure symmetry and its interplay with wave function parity.