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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Condensed Matter Physics
  • Quantum Many-Body Systems

Background:

  • Fermion pairing is crucial for understanding superconductivity and quantum matter.
  • Controlling and observing pairing in low dimensions presents significant experimental challenges.
  • Lattice systems offer tunable platforms to explore fundamental quantum phenomena.

Purpose of the Study:

  • To experimentally investigate fermion pairing in a one-dimensional (1D) lattice of tunable double-well potentials.
  • To characterize the different types of atom pairs and their symmetries.
  • To validate a theoretical model for predicting pairing phenomena in complex lattice structures.

Main Methods:

  • Utilized radio-frequency spectroscopy to probe atom pair states.
  • Employed a 1D lattice of tunable double-well potentials with bichromatic modulation.
  • Extended the Green's function method to incorporate bichromatic lattices and radial confinement.

Main Results:

  • Observed the coexistence of two distinct types of fermion pairs with differing symmetries.
  • Spectroscopic measurements showed excellent quantitative agreement with the developed theoretical model.
  • The model predicted hundreds of discrete transitions, highlighting symmetry-dependent populations and strengths.

Conclusions:

  • The study provides a comprehensive understanding of elementary pairing states in a superlattice.
  • Experimental validation of the theoretical model opens new avenues for studying strongly interacting systems.
  • This work paves the way for future investigations into complex quantum many-body phenomena.