| Probing the flat band of optically trapped spin-orbital-coupled Bose gases using Bragg spectroscopy |
| W.; Chen Li, L.; Chen, Z.; Hu, Y.; Zhang, Z. D.; Liang, Z. X.
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| 2015
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| 发表期刊 | Physical Review A
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| ISSN | 1050-2947
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| 卷号 | 91期号:2 |
| 摘要 | Motivated by recent efforts in creating flat bands in ultracold atomic systems, we investigate how to probe a flat band in an optically trapped spin-orbital-coupled Bose-Einstein condensate using Bragg spectroscopy. We find that the excitation spectrum and the dynamic structure factor of the condensate are dramatically altered when the band structure exhibits various levels of flatness. In particular, when the band exhibits perfect flatness around the band minima corresponding to a near-infinite effective mass, a quadratic dispersion emerges in the low-energy excitation spectrum; in sharp contrast, for the opposite case when an ordinary band is present, the familiar linear dispersion arises. Such linear-to-quadratic crossover in the low-energy spectrum presents a striking manifestation of the transition of an ordinary band into a flat band, thereby allowing a direct probe of the flat band by using Bragg spectroscopy. |
| 部门归属 | [li, wu
; chen, lei
; zhang, zhidong
; liang, zhaoxin] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china. [chen, zhu] inst appl phys & computat math, natl key lab sci & technol computat phys, beijing 100088, peoples r china. [hu, ying] austrian acad sci, inst quantum opt & quantum informat, a-6020 innsbruck, austria.
; liang, zx (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, liaoning, peoples r china.
; zhxliang@imr.ac.cn
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| 关键词 | Einstein Condensate
Neutral Atoms
Superfluidity
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| URL | 查看原文
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/73846
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| 专题 | 中国科学院金属研究所
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推荐引用方式
GB/T 7714 |
W.,Chen Li, L.,Chen, Z.,et al. Probing the flat band of optically trapped spin-orbital-coupled Bose gases using Bragg spectroscopy[J]. Physical Review A,2015,91(2).
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| APA |
W.,Chen Li, L.,Chen, Z.,Hu, Y.,Zhang, Z. D.,&Liang, Z. X..(2015).Probing the flat band of optically trapped spin-orbital-coupled Bose gases using Bragg spectroscopy.Physical Review A,91(2).
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| MLA |
W.,et al."Probing the flat band of optically trapped spin-orbital-coupled Bose gases using Bragg spectroscopy".Physical Review A 91.2(2015).
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