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Ferromagnetism in a few-fermion atom gas
Gareth Conduit
TCM Group, Department of Physics
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Condensed matter across the length scales
Few-fermionic atoms Electron gas Alloy design
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Condensed matter across the length scales
Few-fermionic atoms Electron gas Alloy design
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Ni combustor linerRolls-Royce invention NC13006 (2013)
Mo-Hf forging alloyPatent GB1307533.8 (2013)
Mo-Nb forging alloyPatent GB1307535.3 (2013)
RR1000 grain growthActa Materialia, 61, 3378 (2013)
Concurrent materials design
Ni disc alloyRolls-Royce invention NC12261 (2012)
Discovery algorithmPatent GB1302743.8 (2013)
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Homogeneous electron gas
Interaction strength
Paramagnet Ferromagnet
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Homogeneous electron gas
Interaction strength
Paramagnet Spiral Ferromagnet
GJ Conduit, AG Green, BD Simons, Phys. Rev. Lett. 103, 200403 (2009)
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Homogeneous electron gas
S Lausberg et al. Phys. Rev. Lett. 109, 216402 (2012)
Experiment
Interaction strength
Paramagnet Spiral Ferromagnet
GJ Conduit, AG Green, BD Simons, Phys. Rev. Lett. 103, 200403 (2009)
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Few-fermion ferromagnet
6Li atom
Up spin
Down spin
GJ Conduit & PO Bugnion, arXiv:1304.3299
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Trapped atoms
F Serwane et al., Science 332, 336 (2011)G Zürn et al., Phys. Rev. Lett. 108, 075303 (2012)
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Tunneling probe
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Tunneling probe
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Tunneling probe
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Tunneling probability
StrongWeak
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Tunneling probability
StrongWeak
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Tunneling probability
StrongWeak
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Why probability of ½?
Lose
Lose
Ferro
Ferro
Para
∣⟩
∣⟩+∣⟩
∣⟩-∣⟩
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Tunneling probability
StrongWeak
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Two-atom scattering
r
V(r)
a
Repulsive
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Two-atom scattering
r
V(r)
ar
V(r)
a
Repulsive Attractive
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Two-atom scattering
r
V(r)
ar
V(r)
ar
V(r)
a
Repulsive Attractive Repulsive
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Two-atom scattering
r
V(r)
ar
V(r)
ar
V(r)
a
Repulsive Attractive Repulsive
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Three-atom bound state
StrongWeak
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Loss affected region
StrongWeak
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Time evolution
StrongWeak
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Time evolution
StrongWeak
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Single atom tunneling
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Single atom tunneling
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Single atom tunneling
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Quantum coherent tunneling
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Quantum coherent tunneling
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Condensed matter across the length scales
Few-fermionic atoms Electron gas Alloy design