Helicoidal excitonic phase in an electron-hole double-layer system

Helicoidal excitonic phase in an electron-hole double-layer system
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电子空穴双层系统中的螺旋激子相

DOI:
10.1103/physrevb.100.035130
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发表时间:
2019-04
期刊:
影响因子:
3.7
通讯作者:
Ryuichi Shindou
Ryuichi Shindou
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ke Chen;Ryuichi Shindou

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我们提出了具有相对论自旋轨道相互作用的库仑耦合二维电子空穴双层(EHDL)系统中的螺旋激子相。此前,研究表明层状InAs/AlSb/GaInSb异质结构是寻找激子凝聚相的理想实验平台,其电子层具有不可忽略的Rashba相互作用。我们阐明,由于 Rashba 项,EHDL 系统中的自旋三重态 (spin-1) 激子场形成螺旋结构,并且螺旋平面可以由面内塞曼场控制。我们表明,由于重空穴层中小但有限的狄拉克项,面内场下激子场的螺旋结构导致电子层中的螺旋{\it磁}序。基于线性化分析,我们进一步计算了螺旋激子相中低能戈德斯通模式的动量-能量色散。我们讨论了 EHDL 系统中激子相的可能实验探针。
We propose helicoidal excitonic phase in a Coulomb-coupled two-dimensional electron-hole double layer (EHDL) system with relativistic spin-orbit interaction. Previously, it was demonstrated that layered InAs/AlSb/GaInSb heterostructure is an ideal experimental platform for searching excitonic condensate phases, while its electron layer has non-negligible Rashba interaction. We clarify that due to the Rashba term, the spin-triplet (spin-1) exciton field in the EHDL system forms a helicoidal structure and the helicoid plane can be controlled by an in-plane Zeeman field. We show that due to small but finite Dirac term in the heavy hole layer the helicoidal structure of the excitonic field under the in-plane field results in a helicoidal {\it magnetic} order in the electron layer. Based on linearization analyses, we further calculate momentum-energy dispersions of low-energy Goldstone modes in the helicoidal excitonic phase. We discuss possible experimental probes of the excitonic phase in the EHDL system.
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