Tel Aviv University


Tel Aviv University
Condensed Matter Theory Seminar

Academic Year  2003 - 2004


The seminar is held in Room 204 in the Shenkar Physics Building, every Monday at 16:00

 

April 19, 2004

"Hopping transport through a nanoconstriction controlled by a single hop"

Prof. Veniamin Kozub
The Ioffe Institute, St. Petersburg


     Hopping transport through a point contact between two bulk semiconductors is considered for the case when the contact size is much smaller than a typical hopping length in the bulk. In this case the conductance is controlled by a single hop between the two sites located on the opposite banks of the contact. For variable range hopping (VRH) the choice of the pair depends on temperature, and the temperature dependence of the conductance exhibits exponentially large mesoscopic fluctuations. For large enough voltage the conductance is strongly nonlinear and also exhibits giant fluctuations as a result of "switching" between different "critical pairs". It also exhibits regions of negative differential resistance due to resonant tunneling effective at some "resonant" values of the bias. At higher biases the nonlinear I(V) curve tends to a smooth one (I proportional to V2).  

Host: Prof. Amnon Aharony, x8558
 
Fall 2003 Schedule Spring 2004 Schedule

For more information or for directions to 204 Shenkar please contact: Chava Balson  03-6408300

To suggest potential speakers or register feedback contact:  Ron Lifshitz  03-6405145


Sponsored by:   The Condensed Matter Physics Department, The School of Physics & Astronomy, Tel Aviv University.