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. 2016 Sep 20;6:33686. doi: 10.1038/srep33686

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(a) The current is given by overlap between the transmission and the distribution function. The width of the distribution function f_L − f_R is limited by the electron temperature. The current is switched on when the transmission (green curve) and the distribution function has a significant overlap; and the current is switched off when the transmission (red curve) is moved away from the distribution function. The gate voltage for switching the current is then limited by the temperature. (b) The gate varies the form of the transmission function, and at a specific gate voltage V_c (or within a range of the gate voltage), the transmission function is greatly suppressed in (rather than moved from) the interval of the distribution function.