Doped colloidal artificial spin ice
We examine square and kagome artificial spin ice for colloids confined in arrays of double-well traps. Conversely, magnetic artificial spin ices, unlike colloidal and vortex artificial spin ice realizations, allow creation of doping sites through double occupation of individual traps. We find that doping square and kagome ice geometries produces opposite effects. For square ice, doping creates local excitations in the ground state configuration that produce a local melting effect as the temperature is raised. In contrast, the kagome ice ground state can absorb the doping charge without generating non-ground-state excitations, while at elevated temperatures the hopping of individual colloids is suppressed near the doping sites. Our results indicate that in the square ice, doping adds degeneracy to the ordered ground state and creates local weak spots, while in the kagome ice, which has a highly degenerate ground state, doping locally decreases the degeneracy and creates local hard regions.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- Grant/Contract Number:
- AC52-06NA25396; PN-II-RU-TE-2011-3-0114
- OSTI ID:
- 1238997
- Alternate ID(s):
- OSTI ID: 1236014; OSTI ID: 1238998
- Report Number(s):
- LA-UR-15-24826
- Journal Information:
- New Journal of Physics, Journal Name: New Journal of Physics Vol. 17 Journal Issue: 10; ISSN 1367-2630
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
Similar Records
Topological defects from doping and quenched disorder in artificial ice systems
Ice rule fragility via topological charge transfer in artificial colloidal ice