论文标题
具有中性和带电的GAAS双层双极激子的双密度波
Dual density waves with neutral and charged dipolar excitons of GaAs bilayers
论文作者
论文摘要
晶格电位中密切相关的量子颗粒是多种量子绝缘子的构建块，例如莫特相和密度波破坏了晶格对称性。这种集体状态可用于骨髓和费米子系统。为了进一步扩大可访问量子物质阶段的光谱，将这两个物种混合在理论上具有吸引力，因为密度顺序随后与相分离竞争。在这里，我们通过限制中性（玻色子状）并在GAAS双层的人造方形晶格中进行带电（Fermion样的）偶极激子来操纵这种Bose-Fermi混合物。在统一的晶格填充时，当带电的激子的分数约为1/3、1/2、2/3）时，强烈的间和内物种相互作用稳定了绝缘阶段。我们证明然后实现双玻色纤维密度波，并在交替条纹中排序物种。我们的观察结果表明，偶性激子允许通过异地相互作用扩展的Bose-Fermi Hubbard模型的控制实现。
Strongly correlated quantum particles in lattice potentials are the building blocks for a large variety of quantum insulators, for instance Mott phases and density waves breaking the lattice symmetry. Such collective states are accessible to bosonic and fermionic systems. To expand further the spectrum of accessible quantum matter phases, mixing both species is theoretically appealing, since density order then competes with phase separation. Here we manipulate such Bose-Fermi mixture by confining neutral (boson-like) and charged (fermion-like) dipolar excitons in an artificial square lattice of a GaAs bilayer. At unitary lattice filling, strong inter- and intra-species interactions stabilise insulating phases when the fraction of charged excitons is around (1/3, 1/2, 2/3). We evidence that dual Bose-Fermi density waves are then realised, with species ordered in alternating stripes. Our observations highlight that dipolar excitons allow for controlled implementations of Bose-Fermi Hubbard models extended by off-site interactions.
