期刊
PHYSICAL REVIEW LETTERS
卷 96, 期 13, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.96.136602
关键词
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The current-voltage characteristics of layered organic crystals theta-(BEDT-TTF)(2)MZn(SCN)(4) (M=Cs,Rb) follow the power law with a large exponent (e.g., 8.4 at 0.29 K for M=Cs) over a wide range of currents in the low-temperature insulating state. The power-law characteristics are attributed to electric field-induced unbinding of electron-hole pairs that are thermally excited in the background of the two-dimensional charge order. The magnitude of crossover electric fields from Ohmic to the power-law characteristics indicates that the electron-electron Coulomb interaction is significantly long-ranged: The screening length is greater than 10 molecule sites.
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