scholarly journals Quantum metric and wave packets at exceptional points in non-Hermitian systems

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
D. D. Solnyshkov ◽  
C. Leblanc ◽  
L. Bessonart ◽  
A. Nalitov ◽  
Jiahuan Ren ◽  
...  
Keyword(s):  
Wave Packets ◽  
Exceptional Points

Interferometric (Fourier-Spectroscopic) Measurement of Electron Energy Distributions

1990 ◽  
Vol 48 (2) ◽  
pp. 110-111 ◽  
Author(s):  
F. Hasselbach ◽  
A. Schäfer
Keyword(s):  
Group Velocity ◽  
Wave Packets ◽  
Index Of Refraction ◽  
Electron Wave ◽  
Fringe Contrast ◽  
Faraday Cage ◽  
Optical Index ◽  
Wien Filter ◽  
Coherent Wave ◽  
Electric And Magnetic Fields

Möllenstedt and Wohland proposed in 1980 two methods for measuring the coherence lengths of electron wave packets interferometrically by observing interference fringe contrast in dependence on the longitudinal shift of the wave packets. In both cases an electron beam is split by an electron optical biprism into two coherent wave packets, and subsequently both packets travel part of their way to the interference plane in regions of different electric potential, either in a Faraday cage (Fig. 1a) or in a Wien filter (crossed electric and magnetic fields, Fig. 1b). In the Faraday cage the phase and group velocity of the upper beam (Fig.1a) is retarded or accelerated according to the cage potential. In the Wien filter the group velocity of both beams varies with its excitation while the phase velocity remains unchanged. The phase of the electron wave is not affected at all in the compensated state of the Wien filter since the electron optical index of refraction in this state equals 1 inside and outside of the Wien filter.

Thermal self-action of acoustic wave packets in a liquid

1995 ◽  
Vol 165 (10) ◽  
pp. 1145 ◽  
Author(s):  
F.V. Bunkin ◽  
Gennadii A. Lyakhov ◽  
K.F. Shipilov
Keyword(s):  
Acoustic Wave ◽  
Wave Packets

Propagation properties of Airy Ince–Gaussian wave packets in gradient-index media

2019 ◽  
Vol 16 (2) ◽  
pp. 026004 ◽  
Author(s):  
Xi Peng ◽  
Yingji He ◽  
Dongmei Deng ◽  
Yunli Qiu ◽  
Xing Zhu ◽  
...  
Keyword(s):  
Wave Packets ◽  
Gradient Index ◽  
Propagation Properties ◽  
Gaussian Wave Packets
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