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Abstract: Negative differential resistivity NDR in a 3+1-dimensional quantum systemof strongly correlated charge carriers is theoretically reproduced by using theAdS-CFT correspondence. Our system is microscopically defined, and the analysisdoes not rely on any phenomenological models of NDR mechanism. The interactionbetween the heat reservoir and the nonequilibrium charge carriers is also takeninto account. The system realizes insulation due to the formation of theneutral bound states of the charge carriers at low temperatures. However, theinsulation is broken and the field-induced conductor phase appears by applyingthe external electric field greater than the critical value. We find that theNDR appears right above the critical electric field in this phase, and the paircreation of the charge carriers is crucial to realize the NDR. The presentresult suggests a possibility to observe a similar NDR in excitonic insulatorsor in the strongly interacting quark-gluon plasma, where the insulationoriginates in the formation of the neutral bound states.



Autor: Shin Nakamura Kyoto Univ.

Fuente: https://arxiv.org/







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