| Issue |
EPL
Volume 105, Number 4, February 2014
|
|
|---|---|---|
| Article Number | 40005 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/105/40005 | |
| Published online | 07 March 2014 | |
Cumulants associated with geometric phases
Department of Physics, Bilkent University - TR-06800 Bilkent, Ankara, Turkey
Received: 2 January 2014
Accepted: 19 February 2014
The Berry phase can be obtained by taking the continuous limit of a cyclic product 
, resulting in the circuit integral 
. Considering a parametrized curve 
we show that a set of cumulants can be obtained from the product 
. The first cumulant corresponds to the Berry phase itself, the others turn out to be the associated spread, skew, kurtosis, etc. The cumulants are shown to be gauge invariant. Then the spread formula from the modern theory of polarization is shown to correspond to the second cumulant of our expansion. It is also shown that the cumulants can be expressed in terms of the expectation value of an operator. An example of the spin-
particle in a precessing magnetic field is analyzed.
PACS: 03.65.Vf – Phases: geometric; dynamic or topological / 03.65.Ca – Formalism / 02.50.Cw – Probability theory
© EPLA, 2014
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