Composition of quantum ratchets with chaotic dots
2001 (English)In: Japanese Journal of Applied Physics, ISSN 0021-4922, Vol. 40, no 6A, 4269-4271 p.Article in journal (Refereed) Published
We present a proposal for a new type of quantum ratchets in application of weak-localization (WL) effect in mesoscopic chaotic dots. Coherent electrons transport through the dots under an applied ac voltage and a synchronized pulsating magnetic field. In the first half cycle of the voltage alternation with no magnetic field, the WL effect reduces the electron transmission on average, while the applied magnetic field breaks the time-reversal symmetry in the latter half cycle, suppressing the WL effect. As a result, nonvanishing amount of net electric current in one direction can be measured. We exactly calculate the net electric current which is found accessible in experiments. It is also suggested that the observation of this rectified current is a good quantitative measure of the WL effect in mesoscopic chaotic dots, in contrast with the WL lineshape measurement.
Place, publisher, year, edition, pages
2001. Vol. 40, no 6A, 4269-4271 p.
quantum ratchet, quantum dot, weak localization, chaotic dot, mesoscopic physics
IdentifiersURN: urn:nbn:se:liu:diva-49171OAI: oai:DiVA.org:liu-49171DiVA: diva2:270067