Phonons in two-dimensional soft colloidal crystals
文献类型：期刊论文
| 作者 | Chen, K ; Still, T ; Schoenholz, S ; Aptowicz, KB ; Schindler, M ; Maggs, AC ; Liu, AJ ; Yodh, AG |
| 刊名 | PHYSICAL REVIEW E
 |
| 出版日期 | 2013 |
| 卷号 | 88期号:2 |
| ISSN号 | 1539-3755 |
| 通讯作者 | Chen, K (reprint author), Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA. |
| 中文摘要 | The vibrational modes of pristine and polycrystalline monolayer colloidal crystals composed of thermosensitive microgel particles are measured using video microscopy and covariance matrix analysis. At low frequencies, the Debye relation for two-dimensional harmonic crystals is observed in both crystal types; at higher frequencies, evidence for van Hove singularities in the phonon density of states is significantly smeared out by experimental noise and measurement statistics. The effects of these errors are analyzed using numerical simulations. We introduce methods to correct for these limitations, which can be applied to disordered systems as well as crystalline ones, and we show that application of the error correction procedure to the experimental data leads to more pronounced van Hove singularities in the pristine crystal. Finally, quasilocalized low-frequency modes in polycrystalline two-dimensional colloidal crystals are identified and demonstrated to correlate with structural defects such as dislocations, suggesting that quasilocalized low-frequency phonon modes may be used to identify local regions vulnerable to rearrangements in crystalline as well as amorphous solids. |
| 资助信息 | NASA [NNX08AO0G]; DAAD; [DMR12-05463]; [PENN-MRSEC DMR11-20901]; [DMR-1206231] |
| 语种 | 英语 |
| 公开日期 | 2014-01-16 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57334]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Chen, K,Still, T,Schoenholz, S,et al. Phonons in two-dimensional soft colloidal crystals[J]. PHYSICAL REVIEW E,2013,88(2). |
| APA | Chen, K.,Still, T.,Schoenholz, S.,Aptowicz, KB.,Schindler, M.,...&Yodh, AG.(2013).Phonons in two-dimensional soft colloidal crystals.PHYSICAL REVIEW E,88(2). |
| MLA | Chen, K,et al."Phonons in two-dimensional soft colloidal crystals".PHYSICAL REVIEW E 88.2(2013). |
入库方式： OAI收割
来源：物理研究所
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