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In the middle of the nineteenth century, it was observed that two trains passing each other at a high relative speed get pulled towards each other. The same occurs when two cars pass each other at a high relative speed. The reason is that the fluid pressure drops in the region where the fluid speeds up. As the air between the trains or the cars increases in speed, its pressure reduces. The pressure on the outer parts of the vehicles is still the atmospheric pressure, while the resultant...
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Geometrical Pumping with a Bose-Einstein Condensate.

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  • 1Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland, Gaithersburg, Maryland 20899, USA.

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We demonstrated a novel quantum geometric charge pump for Bose-Einstein condensates (BECs). Unlike topological pumps, this method uses local band geometry for non-quantized charge pumping in magnetic lattices.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomic physics

Background:

  • Topological charge pumps in filled bands are quantized by global band properties.
  • Bose-Einstein condensates (BECs) are a state of matter with unique quantum properties.
  • Bipartite magnetic lattices offer novel platforms for studying quantum phenomena.

Purpose of the Study:

  • To realize a quantum geometric charge pump for a BEC.
  • To investigate non-quantized charge pumping in a single crystal momentum state.
  • To explore the role of local band geometry in charge transport.

Main Methods:

  • Utilized a Bose-Einstein condensate (BEC) in the lowest Bloch band.
  • Employed a novel bipartite magnetic lattice.
  • Investigated a quantum geometric pumping mechanism.

Main Results:

  • Achieved non-quantized charge pumping, distinct from topological pumps.
  • Demonstrated that pumping is governed by local geometrical properties of the band structure.
  • Observed overall displacement and temporal modulation (polarization) of the atomic wave packet per pump cycle.

Conclusions:

  • The study presents a new paradigm for charge pumping based on local geometry.
  • This geometric charge pump offers a tunable mechanism for controlling BECs.
  • Findings open avenues for exploring novel quantum transport phenomena in engineered lattices.