Ejection of magnetic-field-sensitive atoms from an optical dipole trap

Kafer, Carol J.; Bourouis, R.; Eurisch, J.; Tripathi, Ajay; Helm, H.

doi:10.1103/physreva.80.023409

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…[48]. We then apply a magnetic field gradient to remove the atoms on |m F = ±1 out of the BEC cloud [49], followed by equilibrating the system by holding for 1 s. After that, we shine a π/2-pulse radio frequency radiation to create a nearly AFM state, which has zero magnetization and zero component on the m F = 0 level. Since the experiment is very sensitive to the initial value of ρ 0 [50], we then immediately apply a microwave pulse for 300 ms with a frequency of 1.7716264 GHz, whose detuning is zero for the clock transition from |F = 1, m F = 0 to |F = 2, m F = 0 [the Rabi rate is about 1.9kHz [51] and the applied magnetic field ranges from 0.2 G to 0.373 G for the experiments in Fig.…”

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confidence: 99%

Observation of Dynamical Quantum Phase Transitions with Correspondence in an Excited State Phase Diagram

et al. 2020

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Dynamical quantum phase transitions are closely related to equilibrium quantum phase transitions for ground states. Here, we report an experimental observation of a dynamical quantum phase transition in a spinor condensate with correspondence in an excited state phase diagram, instead of the ground state one. We observe that the quench dynamics exhibits a non-analytical change with respect to a parameter in the final Hamiltonian in the absence of a corresponding phase transition for the ground state there. We make a connection between this singular point and a phase transition point for the highest energy level in a subspace with zero spin magnetization of a Hamiltonian. We further show the existence of dynamical phase transitions for finite magnetization corresponding to the phase transition of the highest energy level in the subspace with the same magnetization. Our results open a door for using dynamical phase transitions as a tool to probe physics at higher energy eigenlevels of many-body Hamiltonians.

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confidence: 99%

Observation of Dynamical Quantum Phase Transitions with Correspondence in an Excited State Phase Diagram

et al. 2020

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“…In presence of a magnetic field gradient, the atoms in different Zeeman hyperfine state (|F, m F ) experience a force which is dependent on m F . This force is called Stern-Gerlach (SG) force and is given as [20] ,…”

Section: Stern-gerlach Forcementioning

confidence: 99%

Efficient quantum state preparation using Stern-Gerlach effect on cold atoms

Singh,

Tiwari,

Mishra

2022

Preprint

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The Zeeman hyperfine state dependent force in a Stern-Gerlach (SG) experiment has been exploited to separate and detect atoms having different Zeeman hyperfine states in a cold atom cloud. Utilizing this SG technique, we have made the quantitative estimate of atoms in different Zeeman hyperfine states in an atom cloud, which has been helpful in optimizing the optical pumping of atoms for efficient preparation of atomic state. Employing an optimized optical pumping, nearly 92% of cold 87 Rb atoms from a grey magneto-optical trap (G-MOT) on atom-chip have been optically pumped to the trappable Zeeman hyperfine state |F = 2, mF = +2 . These optically pumped atoms have been trapped in an Ioffe-Pritchard magnetic trap near the atom-chip surface.

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“…In presence of a magnetic field gradient, the atoms in different Zeeman hyperfine state (|F, m F ⟩) experience a force which is dependent on m F . This force is called SG force and is given as [25],…”

Section: Sg Forcementioning

confidence: 99%