Quantum ratchets and quantum heat pumps View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2002-08

AUTHORS

H. Linke, T.E. Humphrey, P.E. Lindelof, A. Löfgren, R. Newbury, P. Omling, A.O. Sushkov, R.P. Taylor, H. Xu

ABSTRACT

. Quantum ratchets are Brownian motors in which the quantum dynamics of particles induces qualitatively new behavior. We review a series of experiments in which asymmetric semiconductor devices of sub-micron dimensions are used to study quantum ratchets for electrons. In rocked quantum-dot ratchets electron-wave interference is used to create a non-linear voltage response, leading to a ratchet effect. The direction of the net ratchet current in this type of device can be sensitively controlled by changing one of the following experimental variables: a small external magnetic field, the amplitude of the rocking force, or the Fermi energy. We also describe a tunneling ratchet in which the current direction depends on temperature. In our discussion of the tunneling ratchet we distinguish between three contributions to the non-linear current–voltage characteristics that lead to the ratchet effect: thermal excitation over energy barriers, tunneling through barriers, and wave reflection from barriers. Finally, we discuss the operation of adiabatically rocked tunneling ratchets as heat pumps. More... »

PAGES

237-246

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s003390201335

DOI

http://dx.doi.org/10.1007/s003390201335

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1002498450


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