Modeling the Transistor of the Future
Twenty years ago, Purdue University scientists proposed a highly promising design for a “spin effect” transistor – the Datta-Das transistor, or DDT. To date, however, no one has been able to build a working model. Now JQI researchers have devised a potential solution to the problem: creating a minutely controllable quantum model of the transistor action in a laboratory configuration -- in this case, an ultra-cold beam of atoms manipulated by a laser array. They developed a theoretical simulation in which the DDT electrons would be represented by a stream of ultracold atoms (neon and rubidium could work, among others) that pass through a space, corresponding to the gate in a DDT, in which three crossed laser beams overlap. When the atoms are struck by the first laser beam, the beam puts all the atoms in the same quantum state -- equivalent to the identical spins of the source electrons in a DDT.