Overview Silicon-based electronics have been successful for a number of reasons, including the reliability and cascadability of electronic circuit elements. Electronic circuits can be reliably assembled using well-characterized devices and techniques. Furthermore, electronic logic gates robustly tolerate large errors in the input levels, producing outputs close to ideal logic levels. The output of a device is encoded in the same form (a current or a voltage) as the input of other devices, allowing devices to be cascaded, enabling large-scale systems.

Atomtronics – circuitry composed of interconnected systems of ultracold atoms – is a potentially transformative platform for devices with capabilities beyond those of modern electronics. We propose a research plan to launch atomtronics as a practical platform, keeping in mind the elements required for an effective circuit paradigm. Because atomtronics is embryonic, we will focus on developing the key understanding needed to make it a practical technology.

Our MURI combines the different scientific approaches of atomic, molecular, and optical (AMO) and condensed matter (CM) physics in both experiment and theory, with the practical methodology of electrical engineering (EE), and our research team represents all of these.

Research goals In this MURI, we focus on near-term goals that use the unique properties of ultracold atoms allowing for devices, leading to those with functionality not found in electronic systems. At the same time, we maintain a longer-term vision of a more complete atomtronics architecture. We identify three overarching research themes whose pursuit is essential to more practical development of atomtronic devices, and address these two themes in the five tasks comprising this MURI.

Among the different opportunities for cold atoms as a new material platform are: different atomic species with Fermi or Bose statistics; richness of internal spin states; charge neutrality; control of interactions; different and large masses; and excellent isolation from the environment.

Vortex nucleation in a Bose–Einstein condensate: from the inside out

We observed a new mechanism for vortex nucleation in Bose–Einstein condensates (BECs) subject to synthetic magnetic fields. We made use of a strong synthetic magnetic field initially localized between a pair of merging BECs to rapidly create vortices in the

Posted in Atomtronics, Group News, Papers Published, RbLi

Geometrical Pumping with a Bose-Einstein Condensate

We realized a quantum geometric “charge” pump for a Bose-Einstein condensate (BEC) in the lowest Bloch band of a novel bipartite magnetic lattice [JQI writeup]. Topological charge pumps in filled bands yield quantized pumping set by the global—topological—properties of the

Posted in Atomtronics, Group News, Papers Published, RbK

Rashba realization: Raman with RF

We theoretically explore a Rashba spin–orbit coupling scheme which operates entirely in the absolute ground state manifold of an alkali atom, thereby minimizing all inelastic processes. An energy gap between ground eigenstates of the proposed coupling can be continuously opened

Posted in Atomtronics, Group News, Papers Published, RbLi

Magnetic phases of spin-1 spin–orbit-coupled Bose gases

Phases of matter are characterized by order parameters describing the type and degree of order in a system. Here we experimentally explore the magnetic phases present in a near-zero temperature spin-1 spin–orbit-coupled atomic Bose gas and the quantum phase transitions

Posted in Atomtronics, Group News, Papers Published, RbLi, Uncategorized

Interaction-driven exotic quantum phases in spin-orbit-coupled spin-1 bosons

We study the interplay between large-spin, spin-orbit coupling, and superfluidity for bosons in a two-dimensional optical lattice, focusing on the spin-1 spin-orbit-coupled system recently realized at the Joint Quantum Institute [Campbell et al., arXiv:1501.05984]. We find a rich quantum phase

Posted in Atomtronics, Group News, Papers Published, Theory

Feshbach enhanced s-wave scattering of fermions: direct observation with optimized absorption imaging

We directly measured the normalized s-wave scattering cross-section of ultracold 40K atoms across a magnetic-field Feshbach resonance by colliding pairs of degenerate Fermi gases (DFGs) and imaging the scattered atoms. We extracted the scattered fraction for a range of bias

Posted in Atomtronics, Group News, Papers Published, RbK

Fourth year review

The fourth year MURI review scheduled for Sep. 26; unlike the past two years this review will be a single-day review. Approximate times: starting at 9:00 AM on the 26th, and ending at 5:00 PM, followed by a 60 minute

Posted in Atomtronics

Measuring Topology featured as a NJP “Highlight of 2013”

Nathan Goldman et al‘s result describing techniques for measuring topology in a laser-coupled honeycomb lattice has been featured as a “Highlight of 2013” by The New Journal of Physics! This rocks! Highlights page: http://iopscience.iop.org/1367-2630/page/highlights-of-2013 Article: http://iopscience.iop.org/1367-2630/15/1/013025/article

Posted in Atomtronics, Group News, Papers Published, Theory

Zitterbewegung featured as a NJP “Highlight of 2013”

Lindsay LeBlanc et al‘s result demonstrating Zitterbewegung in a spin-orbit coupled atomic Bose gas has been featured as a “Highlight of 2013” by The New Journal of Physics!  Way to go team! Highlights page: http://iopscience.iop.org/1367-2630/page/highlights-of-2013 Article: http://iopscience.iop.org/1367-2630/15/7/073011/article

Posted in Atomtronics, Group News, Papers Published, RbK

Third year review rescheduled

Third year review on Dec. 12-13 the atomtronics MURI, and like with last year the review will be a 1.5 day event. Approximate times: starting at 1:00 PM on the 12th, and ending at 5PM on the 13th. The location

Posted in Atomtronics