期刊
NATURE PHYSICS
卷 7, 期 9, 页码 681-686出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2012
关键词
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资金
- Special Coordination Funds for Promoting Science and Technology in Japan
- Navy/SPAWAR [N66001-09-1-2024]
- N66001-09-1-2024, MEXT
- Japan Society for the Promotion of Science (JSPS)
- State of Bavaria
- NSF [DMR-0804775]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0804775] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [18001002] Funding Source: KAKEN
Macroscopic order appears as the collective behaviour of many interacting particles. Prime examples are superfluidity in helium(1), atomic Bose-Einstein condensation(2), s-wave(3) and d-wave superconductivity(4) and metal-insulator transitions(5). Such physical properties are tightly linked to spin and charge degrees of freedom and are greatly enriched by orbital structures(6). Moreover, high-orbital states of bosons exhibit exotic orders distinct from the orders with real-valued bosonic ground states(7). Recently, a wide range of related phenomena have been studied using atom condensates in optical lattices(8-10), but the experimental observation of high-orbital orders has been limited to momentum space(11,12). Here we establish microcavity exciton-polariton condensates as a promising alternative for exploring high-orbital orders. We observe the formation of d-orbital condensates on a square lattice and characterize their coherence properties in terms of population distributions both in real and momentum space.
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