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首页> 外文期刊>Physical review >Exciton condensate modulation in electron-hole bilayers: A real-space visualization
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Exciton condensate modulation in electron-hole bilayers: A real-space visualization

机译：电子-空穴双层中的激子凝结物调制：真实空间可视化

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摘要

We study the texture of the exciton condensate at low temperatures in an independently gated electron-hole bilayer system. A model Hamiltonian is solved in real space within a mean-field approximation. It is found that, with increased electron-hole density polarization, the system experiences phase transformations from the zero center-of-mass momentum superfluid state, through one- and two-dimensional exciton pair modulated states, into the normal state. At weak density polarization, the modulating state resembles the Larkin-Ovchinnikov state in superconductors in the presence of an exchange field in the weak-coupling BCS limit and becomes stripe-like in the strong-coupling BEC limit. In the one-dimensional modulated phase, the density of states exhibits low-energy intragap resonance quasiparticle states, which are localized in the nodal region.
机译：我们研究了在独立门控电子-空穴双层系统中低温下激子冷凝物的织构。哈密​​顿量模型是在平均空间近似范围内的真实空间中求解的。发现随着电子-空穴密度极化的增加，系统经历了从零质心动量超流体状态到一维和二维激子对调制态到正常态的相变。在弱密度极化下，在弱耦合BCS极限中存在交换场的情况下，调制态类似于超导体中的Larkin-Ovchinnikov态，而在强耦合BEC极限中则呈条纹状。在一维调制相中，态密度表现出低能隙内共振准粒子态，其位于节点区域。

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