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Negative Resistance in a Two-Dimensional System with Entropic Barrier |
| ZHANG Xiao-Peng;BAO Jing-Dong |
| Department of Physics, Beijing Normal University, Beijing 100875 |
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| Cite this article: |
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ZHANG Xiao-Peng, BAO Jing-Dong 2005 Chin. Phys. Lett. 22 283-286 |
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Abstract A phenomenon of negative resistance is found in two-dimensional bistable and periodic potentials via Langevin simulation, where output quantities for noise and signal driven system, such as the power-spectrum density modulus and the signal power amplification, can become minima at finite temperatures. In such a system, the curvature of the potential along non-transport degree of freedom at the barrier is larger than that at the local minima. The temperature-dependent effective barrier, i.e. entropic barrier, is introduced via integration over the non-transport variables. The system shows the negative resistance because of the competence between the signal and the entropic barrier.
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| Keywords:
05.40.-a
02.50.-r
05.20.-y
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Published: 01 February 2005
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| PACS: |
05.40.-a
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(Fluctuation phenomena, random processes, noise, and Brownian motion)
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02.50.-r
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(Probability theory, stochastic processes, and statistics)
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05.20.-y
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(Classical statistical mechanics)
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