Fock-Darwin-like quantum dot states formed by charged Mn interstitial ions.
We report a method of creating electrostatically induced quantum dots by thermal diffusion of interstitial Mn ions out of a p-type (GaMn)As layer into the vicinity of a GaAs quantum well. This approach creates deep, approximately circular, and strongly confined dotlike potential minima in a large (200 microm) mesa diode structure without need for advanced lithography or electrostatic gating. Magnetotunneling spectroscopy of an individual dot reveals the symmetry of its electronic eigenfunctions and a rich energy level spectrum of Fock-Darwin-like states with an orbital angular momentum component |lz| from 0 to 11.
Makarovsky
O
O
School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom. oleg.makarovsky@nottingham.ac.uk
Thomas
O
O
Balanov
A G
AG
Eaves
L
L
Patanè
A
A
Campion
R P
RP
Foxon
C T
CT
Vdovin
E E
EE
Maude
D K
DK
Kiesslich
G
G
Airey
R J
RJ