期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 25, 页码 5316-5319出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.5316
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Studies of charge mobilities in an ultracold gas are reported. Calculations for the Na + Na+ system have been carried out as a function of temperature T and densities, and the conductivity of the ultracold charged gas is obtained. The total charge mobility exhibits a sharp increase as T is lowered, indicating a transition hom an almost insulating to a conducting system at few muK. It is shown that the nature of the charge mobility changes with temperature: at high T, the charges are transported by massive centers (i.e., the ions), and at low T, by electrons jumping from neighboring atoms onto the positive ions (the positive holes exhibit hopping conductivity). An experiment is proposed to detect this effect.
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