TWINNING PROGRAM WITH GEORGIA, ROMANIA, AND UKRAINE

Eduard Bogachek and Uzi Landman hosted Ilya Krive of Ukrainian Academy of Sciences Institute for Low Temperature Physics and Engineering for five weeks beginning in October 1999. Bogachek, Landman, and Krive have been investigating issues pertaining to thermoconductance, thermopower, and the Peltier effect in Luttinger liquids. The team has written a paper entitled "Thermo-Electric Effects in a Multichannel Luttinger Liquid," which is to be submitted for publication and will be presented at the American Physical Society meeting in March 2000. They have conducted many group seminars in which Krive lectured on his research on Luttinger liquids, bosonization techniques, and charge-density-wave phenomena in strongly interacting systems, and Bogachek and Landman described their work on energetics and transport properties of nanowires.

Update--2000

In the second year of the project Bogachek was able to visit the Verkin Institute in the fall of 2000, while Krive visited Georgia Institute of Technology for several months afterwards. The reciprocal visits allowed for several group seminars in which Krive, Bogachek, and Landman lectured on their research activities. The visits also resulted in the manuscripts "Interaction Enhanced Thermopower in a Luttinger Liquid," which was published in Physical Review B; "Heat Current Fluctuations and Electric Shot-Noise in Quantum Wires," which has been submitted for publication; and another manuscript in its final stages of preparation and will be submitted to the Journal of Low Temperature Physics.

The results of their study will be presented at the American Physical Society meeting in March 2001. In the study, they investigated the noise in the heat current for fermionic and bosonic systems in the Landauer-Buttiker approach. They demonstrated that the equilibrium thermal noise in a perfect quantum wire does not depend on the statistics of heat carriers. By modeling the leads as reservoirs of 1D noninteracting electrons they calculated the noise power of the heat current through a LL constriction, and showed that it is dominated by the Johnson-Nyquist noise generated by the leads. They have also demonstrated that for weakly interacting electrons, the magnitude of the noise is sensitive to the electron-electron interaction strength. Future plans include investigations of parity-effects in the magnetization of quantum dots, investigations of thermo-electric effects in CDW conductors, and submission of a proposal to NSF to continue the research.

Update--2001

By the end of 2000, it had become clear to the researchers that they needed more time to finish their work. To accommodate this problem, they were granted a no-cost extension through the end of 2001. Krive visited Georgia in the fall of that year. This delay proved worthwhile, achieving “all its scientific objectives, leading to a creative and fruitful joint program of investigations which will extend to future collaboration efforts.” The three-year study resulted in four publications and three presentations, and left room for much more work to come.