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Spinning fermions

R. A. Duine

Spin dependence of atomic and electronic interactions can give rise to propagating regions of aligned spins in solids called spin waves. These have now been observed in a gas of ultracold fermionic atoms.

PhysicsOct 6, 20082 citations

Viewpoint: Swimming in the Fermi sea

Frédéric Chevy

The fermionic analog of a solid-state polaron (an electron surrounded by a cloud of phonons) has been created by dropping a spin-down atom into a Fermi sea of spin-up ultracold atoms.

Jun 8, 20090 citations

Fermionic Atoms Appear to Pair Up Much as Electrons Do in a Superconductor

Barbara Goss Levi

A new experiment reports pair formation when a gas of ultracold potassium-40 atoms is in the largely unexplored region of strong interactions.

Physics TodayMar 1, 20042 citations

Swimming in the Fermi sea

Frédéric Chevy

The fermionic analog of a solid-state polaron (an electron surrounded by a cloud of phonons) has been created by dropping a spin-down atom into a Fermi sea of spin-up ultracold atoms.

PhysicsJun 8, 20094 citations

Spin and charge go their separate ways

Jelena Stajic

Quantum Simulation Strongly interacting chains of fermions are predicted to exhibit two types of collective excitations: spinons, which carry only spin, and holons, which carry only charge. These excitations move at different velocities. Signatures of this so-called spin-charge separation have been observed in solid-state systems, but obtaining direct dynamical evidence is tricky. With this goal in mind, Vijayan et al. perturbed a chain of ultracold interacting fermions housed in a one-dimensional optical lattice by removing one of the atoms. This gave rise to two independent excitations, which the researchers identified as spinons and holons using a quantum gas microscope. Science , this issue p. [186][1] [1]: /lookup/doi/10.1126/science.aay2354Quantum Simulation Strongly interacting chains of fermions are predicted to exhibit two types of collective excitations: spinons, which carry only spin, and holons, which carry only charge. These excitations move at different velocities. Signatures of this so-called spin-charge separation have been observed in solid-state systems, but obtaining direct dynamical evidence is tricky. With this goal in mind, Vijayan et al. perturbed a chain of ultracold interacting fermions housed in a one-dimensional optical lattice by removing one of the atoms. This gave rise to two independent excitations, which the researchers identified as spinons and holons using a quantum gas microscope. Science , this issue p. [186][1] [1]: /lookup/doi/10.1126/science.aay2354

ScienceJan 9, 20200 citations

Coherent spin and spin-spatial excitations in an ultracold Fermi gas

C. R. Becker, Jannes Heinze, J. Krauser +5 more

Bulletin of the American Physical SocietyJun 5, 20130 citations

Viewpoint: Spinning fermions

Abstract

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Viewpoint: Spinning fermions

Abstract

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