Experiments on Quantum Transport of Ultra-Cold Atoms in Optical Potentials

2009 ◽  
pp. 205-237
Author(s):  
Martin C. Fischer ◽  
Mark G. Raizen
Keyword(s):  
Quantum Transport ◽  
Cold Atoms ◽  
Optical Potentials

scholarly journals Nanoscale “Dark State” Optical Potentials for Cold Atoms

2016 ◽  
Vol 117 (23) ◽  
Author(s):  
M. Łącki ◽  
M. A. Baranov ◽  
H. Pichler ◽  
P. Zoller
Keyword(s):  
Cold Atoms ◽  
Dark State ◽  
Optical Potentials

scholarly journals Quantum transport of bosonic cold atoms in double-well optical lattices

2011 ◽  
Vol 84 (1) ◽  
Author(s):  
Yinyin Qian ◽  
Ming Gong ◽  
Chuanwei Zhang
Keyword(s):  
Quantum Transport ◽  
Optical Lattices ◽  
Cold Atoms

scholarly journals Cold atoms in cavity-generated dynamical optical potentials

2013 ◽  
Vol 85 (2) ◽  
pp. 553-601 ◽  
Author(s):  
Helmut Ritsch ◽  
Peter Domokos ◽  
Ferdinand Brennecke ◽  
Tilman Esslinger
Keyword(s):  
Cold Atoms ◽  
Optical Potentials

scholarly journals Cold atoms in twisted-bilayer optical potentials

2019 ◽  
Vol 100 (5) ◽  
Author(s):  
A. González-Tudela ◽  
J. I. Cirac
Keyword(s):  
Cold Atoms ◽  
Optical Potentials

Multi-Frequency Delta-Kicked Models for the Quantum Ratchet Effect

2014 ◽  
Vol 1049-1050 ◽  
pp. 1431-1435
Author(s):  
Lei Chen ◽  
Chao Xiong ◽  
Jin Xiao ◽  
Hong Chun Yuan
Keyword(s):  
Experimental Investigation ◽  
Quantum Transport ◽  
Cold Atoms ◽  
Ratchet Effect ◽  
Frequency Model ◽  
Quantum Resonances

We investigate two multi-frequency delta-kicked models for the quantum ratchet effect, in which a flashing multi-frequency potential periodically acts on a particle. Ratchet currents emerge when quantum resonances are excited. Currents in multi-frequency models may be stronger than those in the previous two-frequency model. Our work expands upon the quantum delta-kicked model and may contribute to experimental investigation of the quantum transport of cold atoms.

Quantum ratchet effect in a time non-uniform double-kicked model

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744063
Author(s):  
Lei Chen ◽  
Zhen-Yu Wang ◽  
Wu Hui ◽  
Cheng-Yu Chu ◽  
Ji-Min Chai ◽  
...  
Keyword(s):  
Evolution Equation ◽  
Quantum System ◽  
Quantum Transport ◽  
Cold Atoms ◽  
Ratchet Effect ◽  
Initial State ◽  
Quantum Resonances ◽  
Quantum Hamiltonian ◽  
Hamiltonian Model ◽  
Zero Momentum

The quantum ratchet effect means that the directed transport emerges in a quantum system without a net force. The delta-kicked model is a quantum Hamiltonian model for the quantum ratchet effect. This paper investigates the quantum ratchet effect based on a time non-uniform double-kicked model, in which two flashing potentials alternately act on a particle with a homogeneous initial state of zero momentum, while the intervals between adjacent actions are not equal. The evolution equation of the state of the particle is derived from its Schrödinger equation, and the numerical method to solve the evolution equation is pointed out. The results show that quantum resonances can induce the ratchet effect in this time non-uniform double-kicked model under certain conditions; some quantum resonances, which cannot induce the ratchet effect in previous models, can induce the ratchet effect in this model, and the strengths of the ratchet effect in this model are stronger than those in previous models under certain conditions. These results enrich people’s understanding of the delta-kicked model, and provides a new optional scheme to control the quantum transport of cold atoms in experiment.

Ratchet Effect in a Triple Delta-Kicked Model

2014 ◽  
Vol 687-691 ◽  
pp. 692-695
Author(s):  
Lei Chen ◽  
Chao Xiong ◽  
Jin Xiao ◽  
Hong Chun Yuan
Keyword(s):  
Experimental Investigation ◽  
Quantum Transport ◽  
Cold Atoms ◽  
Previous Model ◽  
Ratchet Effect ◽  
Initial State ◽  
Quantum Resonances ◽  
Zero Momentum

We investigate the quantum ratchet effect in a triple delta-kicked model. Three symmetric flashing potentials alternately act on a particle with a symmetric and homogeneous initial state of zero momentum. Ratchet currents emerge when quantum resonances are excited. Ratchet currents in the triple model may be stronger than those in the previous model. Our work expands upon the quantum delta-kicked model and may contribute to experimental investigation of the quantum transport of cold atoms.

scholarly journals Comparing the Ratchet Effects of Cold Atoms in Periodically Symmetric and Asymmetric Optical Potentials

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Nkongho Ayuketang Arreyndip ◽  
Kenfack Anatole
Keyword(s):  
Phase Space ◽  
Floquet Theory ◽  
Cold Atoms ◽  
Chaotic Behaviour ◽  
Time Dependent ◽  
Ratchet Effect ◽  
Optical Potentials ◽  
Asymmetric Case ◽  
Ac Fields ◽  
Time Periodic

We consider a particle in a spatial symmetric/asymmetric potential driven by time periodic bichromatic AC fields of ratchet type. The associated time-dependent Schrödinger equation is conveniently tackled with the Floquet theory. We next proceed to investigate the ratchet effect induced by the driver, comparing the symmetric with the asymmetric cases. It turns out that the current in the asymmetric case is stronger than that of the symmetric one. Besides, we also investigate the case where the driver is a delta kicked acting on our spatial potential with more emphasis on its chaotic behaviour. Here we check that the current emerges as the phase space is mixed and that the system with asymmetric spatial potential becomes more chaotic than the symmetric one at low kicking strength.

Loading a dressed Zeeman trap with cold atoms

2004 ◽  
Vol 116 ◽  
pp. 247-252 ◽  
Author(s):  
Y. Colombe ◽  
B. Mercier ◽  
H. Perrin ◽  
V. Lorent
Keyword(s):  
Cold Atoms
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