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We demonstrate that the radiation induced "zero-resistance state" observed ina two-dimensional electron gas is a result of the non-trivial structure of thedensity of states of the systems and the photon assisted transport. A toy modelof a structureless quantum tunneling junction where the system has oscillatorydensity of states catches most of the important features of the experiments. Wepresent a generalized Kubo-Greenwood conductivity formula for the photonassisted transport in a general system, and show essentially the same nature ofthe transport anomaly in a uniform system.Comment: 4 pages, 3 figures. Please send comment to shij@ornl.gov. This  version added a paragraph to discuss the implication of negative conductanc

Radiation-Induced “Zero-Resistance State” and the Photon-Assisted Transport