Wath Time an Incident Wave Packet is Reflected?

Reflection of matter waves by a moving wall

Reflection of a normal incident matter wave by a perfectly reflecting wall moving with a constant velocity is investigated. A surprising phenomenon is found-that if the the wall moves faster than the phase velocity of the incident wave, both the reflected and incident waves propagate in the same direction. This counter-intuitive result is an example which shows that common sense is not always credible when one deals with quantum problems.

Perfect Reflection of Light by an Oscillating Dipole

We show theoretically that a directional dipole wave can be perfectly reflected by a single point-like oscillating dipole. Furthermore, we find that in the case of a strongly focused plane wave up to 85 % of the incident light can be reflected by the dipole. Our results hold for the full spectrum of the electromagnetic interactions and have immediate implications for achieving strong coupling between a single propagating photon and a single quantum emitter.

物质波巨古斯-汉欣位移的观测

Observation of a giant Goos-Hänchen shift for matter waves

本文利用中子自旋回波技术和磁性多层镜观测到物质波的巨古斯-汉欣位移，发现波导效应导致0.65 mm的共振增强位移，并提出可用于薄磁性层量子增强传感。

Analyses of reflection and transmission at moving potential step

The reflection and transmission of wave functions at a potential step is a well-known issue in a textbook of quantum mechanics. We studied the reflection and transmission characteristics analytically when the potential step is moving at a constant velocity $v$ in the same direction as an incident wave function by means of solving the time-dependent Schrödinger equation. As for an infinite potential step, it is known that group velocity is the same as the moving velocity of the potential step. We found two interesting results when the potential step has a finite height of $V_0$. The transmissio…

Goos-Hanchen-like shift of three-level matter wave incident on Raman beams

When a three-level atomic wavepacket is obliquely incident on a "edium slab" consisting of two far-detuned laser beams, there exists lateral shift between reflection and incident points at the surface of a "medium slab", analogous to optical Goos-Hanchen effect. We evaluate lateral shifts for reflected and transmitted waves via expansion of reflection and transmission coefficients, in contrast to the stationary phase method. Results show that lateral shifts can be either positive or negative dependent on the incident angle and the atomic internal state. Interestingly, a giant lateral shift of …

通过反射波的非厄米特皮肤效应探测Floquet拓扑相

Probing Floquet topological phases via non-Hermitian skin effect of reflected waves

研究Floquet陈绝缘体的散射问题，揭示反射波的非厄米特皮肤效应，通过边界共振将反射矩阵的非厄米特 winding 数与Floquet不变量联系起来，提出频率依赖的非平衡拓扑识别方法。