Noise correlations in a Coulomb-blockaded quantum dot.
We report measurements of current noise auto- and cross correlation in a tunable quantum dot with two or three leads. As the Coulomb blockade is lifted at finite source-drain bias, the autocorrelation evolves from super- to sub-Poissonian in the two-lead case, and the cross correlation evolves from positive to negative in the three-lead case, consistent with transport through multiple levels. Cross correlations in the three-lead dot are found to be proportional to the noise in excess of the Poissonian value in the limit of weak output tunneling.
Zhang
Yiming
Y
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
DiCarlo
L
L
McClure
D T
DT
Yamamoto
M
M
Tarucha
S
S
Marcus
C M
CM
Hanson
M P
MP
Gossard
A C
AC