Aharonov–Bohm oscillations in p-type GaAs quantum rings

✍ Scribed by Boris Grbić; Renaud Leturcq; Thomas Ihn; Klaus Ensslin; Dirk Reuter; Andreas D. Wieck

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 520 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2007.08.129

✦ Synopsis

We have explored phase coherent transport of holes in two p-type GaAs quantum rings with orbital radii 420 and 160 nm fabricated with AFM oxidation lithography. Highly visible Aharonov-Bohm (AB) oscillations are measured in both rings, with an amplitude of the oscillations exceeding 10% of the total resistance in the case of the ring with a radius of 160 nm. Beside the h=e oscillations, we resolve the contributions from higher harmonics of the AB oscillations. The observation of a local resistance minimum at B ¼ 0 T in both rings is a signature of the destructive interference of the holes' spins. We show that this minimum is related to the minimum in the h=2e oscillations.