arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1204.0883cond-mat.str-el
收藏

三维多重电荷密度波固体中Peierls相变的证据

Evidence for a Peierls phase-transition in a three-dimensional multiple charge-density waves solid

B. Mansart, M. J. G. Cottet, T. J. Penfold, S. B. Dugdale, R. Tediosi, M. Chergui, F. Carbone

摘要:

随着最近石墨烯的发现,维度对材料性质的影响变得非常明显。电荷有序现象可以通过材料的晶体结构的周期性扭曲在一维中诱导,称为Peierls有序转变。电荷密度波也可以在固体中通过载流子之间的强烈库仑排斥而产生,在极端情况下,维格纳预测,在接近绝对零度的自由空间中,电子气体本身可以诱导结晶。类似的现象在更高的维度中也被观察到,但是相应的相变的微观描述经常是有争议的,并且仍然是基础物理学的一个开放的研究领域。在这里,我们在一个复杂的三维固体中光诱导的电荷排序的熔化和监测随之而来的电荷重新分布,通过探测在一个广泛的光谱范围内的超短激光脉冲的光学响应。虽然光致电子温度远远超过临界值,电荷密度波被保存,直到晶格足够扭曲,诱导相变。结合从头算电子结构计算,我们首次确定了三维体系中多重电荷密度波的Peierls起源.

英文摘要:

The effect of dimensionality on materials properties has become strikingly evident with the recent discovery of graphene. Charge ordering phenomena can be induced in one dimension by periodic distortions of a material's crystal structure, termed Peierls ordering transition. Charge-density waves can also be induced in solids by strong Coulomb repulsion between carriers, and at the extreme limit, Wigner predicted that crystallization itself can be induced in an electrons gas in free space close to the absolute zero of temperature. Similar phenomena are observed also in higher dimensions, but the microscopic description of the corresponding phase transition is often controversial, and remains an open field of research for fundamental physics. Here, we photoinduce the melting of the charge ordering in a complex three-dimensional solid and monitor the consequent charge redistribution by probing the optical response over a broad spectral range with ultrashort laser pulses. Although the photoinduced electronic temperature far exceeds the critical value, the charge-density wave is preserved until the lattice is sufficiently distorted to induce the phase transition. Combining this result with it ab initio} electronic structure calculations, we identified the Peierls origin of multiple charge-density waves in a three-dimensional system for the first time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑