论文标题
在非甲米系统中的特殊点处的量子公制和波袋
Quantum metric and wavepackets at exceptional points in non-Hermitian systems
论文作者
论文摘要
拓扑物理学的通常概念，例如浆果曲率，不能直接应用于非炎症系统。我们表明，另一个对象，量子指标经常在冬宫系统中起次要角色，它在非赫米特系统中的特殊点附近成为一个关键数量，在该系统中，它以完全控制波袋轨迹的描述的方式差异。量子公制行为是构成固定方向的恒定加速度的原因，以及具有可控方向的非恒定恒定速度。这两种贡献都与波袋大小无关。
The usual concepts of topological physics, such as the Berry curvature, cannot be applied directly to non-Hermitian systems. We show that another object, the quantum metric, which often plays a secondary role in Hermitian systems, becomes a crucial quantity near exceptional points in non-Hermitian systems, where it diverges in a way that fully controls the description of wavepacket trajectories. The quantum metric behaviour is responsible for a constant acceleration with a fixed direction, and for a non-vanishing constant velocity with a controllable direction. Both contributions are independent of the wavepacket size.
