1D-Coulomb drag serves as a platform for probing electron-electron interactions in 1D systems. Under the charge fluctuation formalism, the non-reciprocal component of Coulomb drag signal in mesoscopic devices is predicted to rely on the breaking of translational invariance due to intrinsic disorder. In this work, we report the measurement of a Coulomb drag device with a ballistic drag wire, allowing us to study the drag signal in nearly pristine quantum wires. Surprisingly, a non-reciprocal component with strength comparable to that of the reciprocal component is still detected across the measured regime, despite the drag wire being ballistic. We suggest that the non-reciprocal signal arises from low energy disorder in the device, which is consistent with the evolution of the drag wire's conductance at low biases voltages and temperatures. Additionally, the non-reciprocal component of the drag signal shows a power-law temperature dependence that coincides with a diffusive model, while the reciprocal component's temperature dependence cannot be explained under the existing framework. The bias voltage dependence of the drag wire conductance is fitted into three models to extract the interaction parameter and disorder level within the wire, but none of the models provides a fully self-consistent explanation for the data.
Tunable reciprocal and nonreciprocal contributions to 1D Coulomb Drag
University of Florida（佛罗里达大学）；National High Magnetic Field Laboratory（国家高磁场实验室）；Center for Integrated Nanotechnologies, Sandia National Laboratories（桑迪亚国家实验室集成纳米技术中心）
S-shaped current-voltage characteristics of n+-i-n-n+ graphene field-effect transistors due the Coulomb drag of quasi-equilibrium electrons by ballistic electrons
Quasi-1D Coulomb drag between spin-polarized quantum wires
University of Florida（佛罗里达大学）；National High Magnetic Field Laboratory（国家强磁场实验室）；University of Wisconsin–Madison（威斯康星大学麦迪逊分校）；Sandia National Laboratories（桑迪亚国家实验室）
Phonon wind and drag of excitons in monolayer semiconductors
从理论上研究了过渡金属双硫族化合物单层膜中激子的非平衡输运。我们考虑激子与非平衡声子相互作用的情况，例如，在局部激发的条件下形成“热点”。我们发展了声子对激子拖曳的理论，并详细分析了声子的扩散传播和声子的弹道传播的声子风形成的制度。我们证明了类似于在[Phys. Rev. Lett. 120，207401（2018）]可以由于非平衡声子或塞贝克效应的激子拖曳而形成。
Observation of Erratic Non-Hermitian Skin Localization and Transport
Nanjing University（南京大学）；The Pennsylvania State University（宾夕法尼亚州立大学）；Politecnico di Milano（米兰理工大学）；IFISC (UIB-CSIC), Instituto de Fisica Interdisciplinary Sistemas Complejos（复杂系统跨物理研究所（巴伊拉大学-西班牙国家科研委员会））
