Hidden and mirage collective modes in two dimensional Fermi liquids

Hidden and mirage collective modes in two dimensional Fermi liquids
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二维费米液体中的隐藏集体模式和海市蜃楼集体模式

DOI:
10.1038/s41535-020-0250-4
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发表时间:
2020
影响因子:
5.7
通讯作者:
Chubukov, Andrey V.
Chubukov, Andrey V.
中科院分区:
材料科学2区
文献类型:
--
作者:
Klein, Avraham;Maslov, Dmitrii L.;Chubukov, Andrey V.

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对于费米液体中的零声模,长期以来的观点是,对于排斥相互作用,它位于粒子-空穴连续体之外,并在相应的磁化率中产生尖锐的峰值,而对于吸引相互作用,它是粒子-空穴连续体内部的共振。我们认为,在二维费米液体中存在两种额外类型的零声:“隐藏”和“海市蜃楼”模式。一个隐藏的模式已经存在于粒子-空穴连续体之外,用于吸引相互作用。它在磁化率中不表现为尖锐的峰,但决定了费米液体的长时间瞬态响应,并且可以在泵浦-探测实验中识别。当排斥力足够强时,海市蜃楼模式就会出现。与传统的零声不同,它不对应于真正的极点,但它会引起粒子-空穴磁化率的峰值。它可以通过测量峰的宽度来检测,对于海市蜃楼模式,峰的宽度大于单粒子散射率。
The longstanding view of the zero sound mode in a Fermi liquid is that for repulsive interaction it resides outside the particle-hole continuum and gives rise to a sharp peak in the corresponding susceptibility, while for attractive interaction it is a resonance inside the particle-hole continuum. We argue that in a two-dimensional Fermi liquid there exist two additional types of zero sound: “hidden” and “mirage” modes. A hidden mode resides outside the particle-hole continuum already for attractive interaction. It does not appear as a sharp peak in the susceptibility, but determines the long-time transient response of a Fermi liquid and can be identified in pump-probe experiments. A mirage mode emerges for strong enough repulsion. Unlike the conventional zero sound, it does not correspond to a true pole, yet it gives rise to a peak in the particle-hole susceptibility. It can be detected by measuring the width of the peak, which for a mirage mode is larger than the single-particle scattering rate.
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