Single-electron population and depopulation of an isolated quantum dot using a surface-acoustic-wave pulse.
We use a pulse of surface acoustic waves (SAWs) to control the electron population and depopulation of a quantum dot. The barriers between the dot and reservoirs are set high to isolate the dot. Within a time scale of approximately 100 s the dot can be set to a nonequilibrium charge state, where an empty (occupied) level stays below (above) the Fermi energy. A pulse containing a fixed number of SAW periods is sent through the dot, controllably changing the potential, and hence the tunneling probability, to add (remove) an electron to (from) the dot.
Kataoka
M
M
Cavendish Laboratory, J.J. Thompson Avenue, Cambridge CB3 0HE, United Kingdom.
Schneble
R J
RJ
Thorn
A L
AL
Barnes
C H W
CH
Ford
C J B
CJ
Anderson
D
D
Jones
G A C
GA
Farrer
I
I
Ritchie
D A
DA
Pepper
M
M