Confinement effects on an ultra-cold matter wave-packet by a square well impurity near the de-localization threshold: analytic solutions, scaling, and width properties

2015 ◽  
Vol 69 (5) ◽  
Author(s):  
Ricardo Méndez-Fragoso ◽  
Remigio Cabrera-Trujillo
2000 ◽  
Vol 14 (10) ◽  
pp. 1059-1065 ◽  
Author(s):  
JIAN ZOU ◽  
BIN SHAO

The quantum behavior of a particle in a one-dimensional infinite square well potential with a moving wall is studied. The particle is assumed to be initially prepared in the coherent state (Gaussian wave packet) and although the boundary is far from the particle, it is shown that the changing of the boundary conditions can instantaneously affect the dynamical behavior of the particle. It is also shown that the initial state can evolve into a squeezed state, and in some cases the spreading of the wavepacket could be suppressed. Finally the Pancharatnam phase is also discussed.


2012 ◽  
Vol 27 (33) ◽  
pp. 1250194 ◽  
Author(s):  
L. G. MEDEIROS

In this paper one examines analytical solutions for flat and non-flat universes composed by four components namely hot matter (ultra-relativistic), warm matter (WM) (relativistic), cold matter (CM) (non-relativistic) and cosmological constant. The WM is treated as a reduced relativistic gas (RRG) and the other three components are treated in the usual way. The solutions achieved contains one, two or three components of which one component is of WM type. A solution involving all the four components was not found.


2021 ◽  
Author(s):  
Henning Albers ◽  
Robin Corgier ◽  
Alexander Herbst ◽  
Ashwin Rajagopalan ◽  
Christian Schubert ◽  
...  

Abstract The stability of matter-wave sensors benefits from interrogating large-particle-number atomic ensembles at high cycle rates. The use of quantum-degenerate gases with their low effective temperatures allows constraining systematic errors towards highest accuracy, but their production by evaporative cooling is costly with regard to both atom number and cycle rate. In this work, we report on the creation of cold matter-waves using a crossed optical dipole trap and shaping it by means of an all-optical matter-wave lens. We demonstrate the trade off between residual kinetic energy and atom number by short-cutting evaporative cooling and estimate the corresponding performance gain in matter-wave sensors. Our method is implemented using time-averaged optical potentials and hence easily applicable in optical dipole trapping setups.


2004 ◽  
Vol 70 (5) ◽  
Author(s):  
Wenhua Hai ◽  
Chaohong Lee ◽  
Guishu Chong
Keyword(s):  

2015 ◽  
Vol 56 (12) ◽  
pp. 122110 ◽  
Author(s):  
M. Vubangsi ◽  
M. Tchoffo ◽  
L. C. Fai ◽  
Yu. M. Pisma’k

2014 ◽  
Vol 38 (4) ◽  
pp. 53-67 ◽  
Author(s):  
Rodrigo F. Cádiz ◽  
Javier Ramos

This article describes a synthesis technique based on the sonification of the dynamic behavior of a quantum particle enclosed in an infinite square well. More specifically, we sonify the momentum distribution of a one-dimensional Gaussian bouncing wave packet model. We have chosen this particular case because of its relative simplicity and interesting dynamic behavior, which makes it suitable for a novel sonification mapping that can be applied to standard synthesis techniques, resulting in the generation of appealing sounds. In addition, this sonification might provide useful insight into the behavior of the quantum particle. In particular, this model exhibits quantum revivals, minimizes uncertainty, and exhibits similarities to the case of a classical bouncing ball. The proposed model has been implemented in real time in both the Max/MSP and the Pure Data environments. The algorithm is based on concepts of additive synthesis where each oscillator describes the eigenfunctions that characterize the state evolution of the wave packet. We also provide an analysis of the sounds produced by the model from both a physical and a perceptual point of view.


Geophysics ◽  
1981 ◽  
Vol 46 (9) ◽  
pp. 1301-1303 ◽  
Author(s):  
Y. Leblanc ◽  
L. J. Pascoe ◽  
F. W. Jones

Analytic solutions for the temperature stabilization of both square and circular boreholes are considered. It is found that a previously published solution for a square borehole is incorrect in that it does not reproduce the initially assumed conditions. The correct analytic solution for a square well, as well as that for a circular well, indicates a much more rapid approach to the formation temperature. The temperature stabilization curves for a range of thermal diffusivity values are given.


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