Experimental realization of atomtronic circuit elements in non-equilibrium ultracold atomic systems

<p>Research in the field of atomtronics aims to develop a new paradigm for the use of ultracold\&nbsp;<span style="line-height: 1.6em;">atomic systems in a manner that mimics the functionality of electronic circuits and\&nbsp;</span><span style="line-height: 1.6em;">devices. Given the ubiquity of the electronic transistor and its application to a vast array of\&nbsp;</span><span style="line-height: 1.6em;">signal processing tasks, the development of its atomtronic counterpart is of signicant interest.\&nbsp;</span><span style="line-height: 1.6em;">This dissertation presents the experimental studies of two atomtronic circuit elements: a\&nbsp;</span><span style="line-height: 1.6em;">battery and transistor. Experiments are conducted in an atom-chip-based apparatus utilizing\&nbsp;</span><span style="line-height: 1.6em;">hybrid magnetic and optical trapping techniques that enable one to "pattern" atomtronic\&nbsp;</span><span style="line-height: 1.6em;">circuit elements. An atomtronic battery is realized in a double-well trapping potential in\&nbsp;</span><span style="line-height: 1.6em;">which a finite-temperature Bose-Einstein condensate is prepared in a non-equilibrium state\&nbsp;</span><span style="line-height: 1.6em;">to generate thermodynamic gradients that drive atom current \&nbsp;fl</span><span style="line-height: 1.6em;">ow. Powered by the atomtronic\&nbsp;</span><span style="line-height: 1.6em;">battery, a triple-well atomtronic transistor is demonstrated, and quasi-steady-state\&nbsp;</span><span style="line-height: 1.6em;">behavior of the device is characterized. Results are found to be in agreement with a semiclassical\&nbsp;</span><span style="line-height: 1.6em;">model of the transistor that is also used to study the active properties of the device,\&nbsp;</span><span style="line-height: 1.6em;">including current gain. Based on these results, future directions regarding signal processing\&nbsp;</span><span style="line-height: 1.6em;">operations are proposed.</span></p>
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University of Colorado Boulder
Boulder, CO
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