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Topological flat bands from dipolar spin systems.

N Y Yao1, C R Laumann, A V Gorshkov

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

We propose a physical system with two-dimensional topological nearly flat bands using driven dipoles. This system exhibits exotic quantum phases like superfluidity and supersolidity.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomic physics

Background:

  • Topological phases of matter offer unique properties for quantum technologies.
  • Nearly flat bands are crucial for realizing strongly correlated quantum phenomena.
  • Controlling gauge fields in quantum systems is a key challenge.

Purpose of the Study:

  • To propose and analyze a novel physical system exhibiting two-dimensional topological nearly flat bands.
  • To investigate the potential for creating tunable gauge fields using dipolar interactions.
  • To explore the quantum phases emerging in this system.

Main Methods:

  • Utilizing an array of three-level dipoles (effective S=1 spins) driven by inhomogeneous electromagnetic fields.
  • Employing dipolar interactions to generate uniform background gauge fields for dressed spin flips (hard-core bosons).
  • Performing exact diagonalization of the full interacting Hamiltonian at half-filling.

Main Results:

  • Demonstrated a physical system naturally admitting two-dimensional topological nearly flat bands.
  • Showcased the creation of tunable gauge fields via dipolar interactions.
  • Identified superfluid, crystalline, and supersolid phases in the system.
  • Observed topological band structures where the band gap exceeds the bandwidth.

Conclusions:

  • The proposed system provides a promising platform for realizing topological phenomena and strongly correlated states.
  • Experimental realization using ultracold polar molecules or solid-state spins is feasible.
  • This work opens avenues for exploring novel quantum phases and applications in quantum information science.