论文标题
三层激子在原子薄的异质结构中的量子相变
Quantum phase transitions of tri-layer excitons in atomically thin heterostructures
论文作者
论文摘要
我们确定了对称过渡金属二甲基三层异质结构WSE2/MOSE2/WSE2中激子中激子的零气压相图。第一个原理计算显示了两种不同类型的层间激体状态，较低的能量对称四极杆和较高的能量不对称偶极子。虽然四极激激子之间的相互作用总是令人反感的，但反行偶极激子在大距离上吸引。我们发现，由Ickiton-Exciton相互作用与单个激子能量之间的竞争驱动，排斥四极晶格相和交错的（反平行）偶极晶格相之间的量子相变。值得注意的是，每个阶段中每个层间激子的内在性质都是完全不同的。这是一个引人注目的示例，用于在一个系统中可能具有丰富的量子物理学的示例，在该系统中，单个粒子特性和多体状态通过粒子相互作用动态耦合。
We determine the zero temeperature phase diagram of excitons in the symmetric transition-metal dichalcogenide tri-layer heterosctructure WSe2/MoSe2/WSe2. First principle calculations reveal two distinct types of interlayer excitonic states, a lower energy symmetric quadrupole and a higher energy asymmetric dipole. While interaction between quadrupolar excitons is always repulsive, anti-parallel dipolar excitons attract at large distances. We find quantum phase transitions between a repulsive quadrupole lattice phase and a staggered (anti-parallel) dipolar lattice phase, driven by the competition between the exciton-exciton interactions and the single exciton energies. Remarkably, the intrinsic nature of each interlayer exciton is completely different in each phase. This is a striking example for the possible rich quantum physics in a system where the single particle properties and the many-body state are dynamically coupled through the particle interactions.
