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.
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Yiming
Y
Zhang
L
L
DiCarlo
D T
DT
McClure
M
M
Yamamoto
S
S
Tarucha
C M
CM
Marcus
M P
MP
Hanson
A C
AC
Gossard