Controlling competing orders via nonequilibrium acoustic phonons: Emergence of anisotropic effective electronic temperature
Controlling competing orders via nonequilibrium acoustic phonons: Emergence of anisotropic effective electronic temperature
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DOI：
10.1103/physrevb.97.035135
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发表时间：
2017-02
影响因子：
3.7
通讯作者：
M. Schutt;P. P. Orth-P.;A. Levchenko;R. Fernandes
中科院分区：
文献类型：
--
作者：
M. Schutt;P. P. Orth-P.;A. Levchenko;R. Fernandes
超快扰动提供了一个独特的工具来操纵相关系统，因为它们能够促进瞬态行为，而没有平衡对应物。一种广泛采用的策略是激发相干光学声子，因为它们可以在短时间尺度上引起电子结构和相互作用的显着变化。在这里，我们探索一个有前途的替代路线：声学声子的非平衡激发。我们证明，它导致了显着的现象的动量依赖的温度，在费米表面的不同区域的电子态受到不同的局部温度。这种各向异性的电子温度可以对非常规超导体中竞争有序态之间的微妙平衡产生深远的影响，为控制相关相开辟了一条新途径。
Ultrafast perturbations offer a unique tool to manipulate correlated systems due to their ability to promote transient behaviors with no equilibrium counterpart. A widely employed strategy is the excitation of coherent optical phonons, as they can cause significant changes in the electronic structure and interactions on short time scales. Here, we explore a promising alternative route: the non-equilibrium excitation of acoustic phonons. We demonstrate that it leads to the remarkable phenomenon of a momentum-dependent temperature, by which electronic states at different regions of the Fermi surface are subject to distinct local temperatures. Such an anisotropic electronic temperature can have a profound effect on the delicate balance between competing ordered states in unconventional superconductors, opening a novel avenue to control correlated phases.