## Finite-frequency correlations and counting statistics
in nanoscale transport

### Clive Emary

TU Berlin

**Thursday, 30 September 2010, 14:00**

Matfys library

**Abstract**:

The topic of full counting statistics provides a method to
extract information about a nanoscopic conductor from the statistics
of an electron current passing through it. Typically, only the
zero-frequency (or long-time limit) statistics are discussed, but
in this talk I discuss how much more can be gleaned about the system
by considering current correlations and counting statistics at finite
frequencies and measurement times.
I will discuss our recent quantum master equation calculations and focus
on the nonMarkovian effects that arise from correlations
between the system and leads. These are pivotol in describing e.g.
quantum noise in situations where the measurement frequency is
larger than applied voltage and temperature. As physical examples of when
nonMarkovian examples play an important role, I discuss
the detector back-action of Single Electron Transistors, the short-time
counting statistics of quantum dots and the finite-frequency
current noise through a double quantum dot charge qubit at arbitrary bias
voltages.