We report on shot noise cross spectrum measurements in a beam splitter configuration. Electrons tunneling through potential barriers are incident on a beam splitter and scattered into two separate channels. Such a partition process introduces correlations between the fluctuations of the two currents. Our work has confirmed that the generally expected negative correlations resulted from sub-Poissonian electron sources. More interestingly, positive cross correlations associated with barriers exhibiting super-Poissonian shot noise have also been observed. We have found that both positive and negative correlations can be related to the noise properties of the electron source.
Published in Physical Review Letters, Volume 97, Issue 6, 2006, pages 066604-1-066604-4.
Chen, Y. and Webb, R.A. (2006). Positive Current Correlations Associated with Super-Poissonian Shot Noise. Physical Review Letters, 97(6), 066604-1 - 066604-4. doi: 10.1103/PhysRevLett.97.066604
© 2006 The American Physical Society.