Patent ID: 6919213

Claim:
A method of changing amplitude of electric signals, comprising the steps of: a. providing a semiconductor material having a first region, a second region, and a third region, wherein the first region is adjacent to the second region so as to form a first domain between the first region and the second region, and the second region is adjacent to the third region so as to form a second domain between the second region and the third region; b. providing a first voltage between the first region and the second region to cause carriers to move across the first domain from the first region to the second region; and c. generating a second voltage between the second region and the third region to cause the carriers move across the second domain from the second region to the third region and the second voltage has an amplitude different from that of the first voltage, wherein the first region and the third region have a first spin polarization, and the second region has a second spin polarization different from the first spin polarization; and wherein the carriers in each of the first, second and third regions have the same charge polarity.