Excitation Spectrum and Stability from a Filled Landau Level in Rotating Dipolar Fermi Gases

Filled Landau levels in neutral quantum gases

We consider the signatures of the Integer Quantum Hall Effect in a degenerate gas of electrically neutral atomic fermions. An effective magnetic field is achieved by applying two incident light beams with a high orbital angular momentum. We show how states corresponding to completely filled Landau levels are obtained and discuss various possibilities to measure the incompressible nature of the trapped two-dimensional gas

Few-body bound states in dipolar gases and their detection

We consider dipolar interactions between heteronuclear molecules in a low-dimensional setup consisting of two one-dimensional tubes. We demonstrate that attraction between molecules in different tubes can overcome intratube repulsion and complexes with several molecules in the same tube are stable. In situ detection schemes of the few-body complexes are proposed. We discuss extensions to the case of many tubes and layers, and outline the implications of our results on many-body physics.

Strongly Correlated States of Ultracold Rotating Dipolar Fermi Gases

We study strongly correlated ground and excited states of rotating quasi-2D Fermi gases constituted of a small number of dipole-dipole interacting particles with dipole moments polarized perpendicular to the plane of motion. As the number of atoms grows, the system enters {\it an intermediate regime}, where ground states are subject to a competition between distinct bulk-edge configurations. This effect obscures their description in terms of composite fermions and leads to the appearance of novel composite fermion quasi-hole states. In the presence of dipolar interactions, the principal Laughl…

范德瓦尔斯异质结中由排斥偶极相互作用驱动的激子输运

Excitonic transport driven by repulsive dipolar interaction in a van der Waals heterostructure

本研究针对范德瓦尔斯异质结中稀薄体系的层间激子，探究排斥偶极相互作用对其输运动力学的影响，通过时空分辨光致发光成像观测发现相互作用可使扩散系数提升一个数量级，为激子器件发展提供了新方向。

Fractional Quantum Hall States of Dipolar Gases in Chern Bands

We study fermions and hardcore bosons with long range dipolar interactions at fractional fillings in a topological checkerboard lattice with short-range hoppings up to next-next-nearest neighbors \cite{Neupert2011}. We consider the case that the dipoles are aligned in the perpendicular direction by an external field without the complication of anisotropic interaction. Using exact diagonalization, we find clear signatures of fractional quantum Hall (FQH) states at filling factors 1/3 and 1/5 for fermions (1/2 and 1/4 for bosons) in the lowest Chern band with a robust spectrum gap at moderate di…

Few-Body Bound Complexes in One-dimensional Dipolar Gases and Non-Destructive Optical Detection

We consider dipolar interactions between heteronuclear molecules in low-dimensional geometries. The setup consists of two one-dimensional tubes. We study the stability of possible few-body complexes in the regime of repulsive intratube interaction, where the binding arises from intertube attraction. The stable dimers, trimers, and tetramers are found and we discuss their properties for both bosonic and fermionic molecules. To observe these complexes we propose an optical non-destructive detection scheme that enables in-situ observation of the creation and dissociation of the few-body complexes…

超冷偶极费米气体中半导体激子的量子模拟

Quantum Simulation of Semiconductor Excitons in Ultracold Dipolar Fermi Gases

受TMD半导体激子物理研究启发，研究冷原子系统中激子类似物形成。通过单组分费米子，预测冷原子激子存在，展示用晶格调制光谱观察及量子气体显微镜绘制波函数的方法，为模拟复杂电子态奠定基础。