Analogs of Basic Electronic Circuit Elements in a Free-Space Atom Chip

Lee, Jeffrey G.; McIlvain, Brian J.; Lobb, C. J.; Hill, W. T.

doi:10.1038/srep01034

Cited by 43 publications

(60 citation statements)

References 13 publications

(17 reference statements)

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“…spatially varying chemical potential and/or temperature. Indeed, atomic systems containing interconnected reservoirs initialized with temperature and chemical potential gradients between the wells have been used to demonstrate behavior analogous to the thermoelectric effect [1] and that of a discharging RLC circuit [2]. In the quantum domain current can exist even in thermal equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of an atomtronic battery

2017

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Operation of an atomtronic battery is demonstrated where a finite-temperature Bose-Einstein condensate stored in one half of a double-well potential is coupled to an initially empty load well that is impedance matched by a resonant terminator beam. The atom number and temperature of the condensate are monitored during the discharge cycle, and are used to calculate fundamental properties of the battery. The discharge behavior is analyzed according to a Thévenin equivalent circuit that contains a finite internal resistance to account for dissipation in the battery. Battery performance at multiple discharge rates is characterized by the peak power output, and the current and energy capacities of the system.

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Section: Introductionmentioning

confidence: 99%

Experimental demonstration of an atomtronic battery

2017

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“…Characteristics of the atoms in these devices include tunable collisional interactions, internal structure, long-range coherence and superfluidity. Thus atom-gas analogs of quite a number of electronic devices have been proposed including diodes [3,4] and transistors [5], and a capacitor discharged through a resistor [6,7]. The coherence and superfluid properties of these systems make them useful as sensors and other devices that can take advantage of superfluidity.…”

Section: Introductionmentioning

confidence: 99%

Probing the circulation of ring-shaped Bose-Einstein condensates

et al. 2013

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This paper reports the results of a theoretical and experimental study of how the initial circulation of ring-shaped Bose-Einstein condensates (BECs) can be probed by time-of-flight (TOF) images. We have studied theoretically the dynamics of a BEC after release from a toroidal trap potential by solving the 3D Gross-Pitaevskii (GP) equation. The trap and condensate characteristics matched those of a recent experiment. The circulation, experimentally imparted to the condensate by stirring, was simulated theoretically by imprinting a linear azimuthal phase on the initial condensate wave function. The theoretical TOF images were in good agreement with the experimental data. We find that upon release the dynamics of the ring-shaped condensate proceeds in two distinct phases. First, the condensate expands rapidly inward, filling in the initial hole until it reaches a minimum radius that depends on the initial circulation. In the second phase, the density at the inner radius increases to a maximum after which the hole radius begins slowly to expand. During this second phase a series of concentric rings appears due to the interference of ingoing and outgoing matter waves from the inner radius. The results of the GP equation predict that the hole area is a quadratic function of the initial circulation when the condensate is released directly from the trap in which it was stirred and is a linear function of the circulation if the trap is relaxed before release. These scalings matched the data. Thus, hole size after TOF can be used as a reliable probe of initial condensate circulation. This connection between circulation and hole size after TOF will facilitate future studies of atomtronic systems that are implemented in ultracold quantum gases.

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“…In the past decade, a variety of atomtronics devices such as atomtronic batteries, diodes, transistors, atom circuits have been proposed theoretically [3][4][5][6][7][8][9][10][11][12][13] and in certain cases realized experimentally [14][15][16]. More recently, a considerable effort has been devoted to the realization of atomic SQUID (superconducting quantum interference device), which are experimentally created by a Bose-Einstein condensate trapped in a toroidal trap with weak links provided by a variety of techniques such as rotating potential barriers, painted potentials, or Laguerre-Gaussian modes of a laser beam.…”

Section: Introductionmentioning

confidence: 99%

Quasi-molecular bosonic complexes-a pathway to SQUID with controlled sensitivity

Safavi-Naini¹,

Capogrosso-Sansone²,

Kuklov³

et al. 2016

New J. Phys.

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Recent experimental advances in realizing degenerate quantum dipolar gases in optical lattices and the flexibility of experimental setups in attaining various geometries offer the opportunity to explore exotic quantum many-body phases stabilized by anisotropic, long-range dipolar interaction. Moreover, the unprecedented control over the various physical properties of these systems, ranging from the quantum statistics of the particles, to the inter-particle interactions, allow one to engineer novel devices. In this paper, we consider dipolar bosons trapped in a stack of one-dimensional optical lattice layers, previously studied in (Safavi-Naini et al 2014 Phys. Rev. A 90 043604). Building on our prior results, we provide a description of the quantum phases stabilized in this system which include composite superfluids (CSFs), solids, and supercounterfluids, most of which are found to be threshold-less with respect to the dipolar interaction strength. We also demonstrate the effect of enhanced sensitivity to rotations of a SQUID-type device made of two CSF trapped in a ring-shaped optical lattice layer with weak links. a dc-SQUID have been carried out in [22,23]. These experiments have paved the way to the atomtronic rotation sensors analogous to magnetic field sensors formed by superconducting devices. While the atom SQUID experiments listed above were performed in the continuum, recent theoretical proposals call for the realization of atomic rf-SQUIDS in ring-shaped optical lattices [24,25].Ultracold atoms in optical lattices provide an ideal platform for engineering systems and devices in a highly controllable manner. The unprecedented level of control and flexibility of these experimental setups allow one to construct a variety of system geometries and manipulate inter-particle interactions in an almost ideal, decoherence-free setup. Moreover the experimental realization of atomic and molecular systems featuring longrange and anisotropic dipolar interactions [26-36] may lead to the experimental observation of the predicted novel phenomena such as p-wave superfluidity, superfluidity of multimers, solids and supersolids. In what follows we discuss quantum phases of hard-core dipolar bosons trapped in a multi-tube geometry, where each tube is a one-dimensional optical lattice and all tubes are parallel to each other and belong to the same plane. An external field is used to align the dipole moments perpendicular to the tubes. This system features a variety of solid phases, composite superfluids (CSFs), and supercounterfluids (SCFs), most of which are predicted to be stabilized at infinitesimal values of dipolar interactions [1]. In particular we use bosonization and renormalization group (RG) techniques, in association with large scale quantum Monte Carlo simulations, to study and confirm the threshold-less nature of these phases.It is important to note that such phases can potentially be used for creating nonlinear elements (and their networks) which can be viewed as generalized Josephson junctions with interestin...

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Analogs of Basic Electronic Circuit Elements in a Free-Space Atom Chip

Cited by 43 publications

References 13 publications

Experimental demonstration of an atomtronic battery

Experimental demonstration of an atomtronic battery

Probing the circulation of ring-shaped Bose-Einstein condensates

Quasi-molecular bosonic complexes-a pathway to SQUID with controlled sensitivity

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