Metastable hard-axis polar state of a spinor Bose-Einstein condensate under a magnetic field gradient

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Title
Metastable hard-axis polar state of a spinor Bose-Einstein condensate under a magnetic field gradient
Author(s)
Joon Hyun Kim; Deokhwa Hong; Seji Kang; Yongil Shin
Publication Date
2019-02
Journal
PHYSICAL REVIEW A, v.99, no.2, pp.023606 -
Publisher
AMER PHYSICAL SOC
Abstract
We investigate the stability of a hard-axis polar state in a spin-1 antiferromagnetic Bose-Einstein condensate under a magnetic field gradient, where the easy-plane spin anisotropy is controlled by a negative quadratic Zeeman energy q<0. In a uniform magnetic field, the axial polar state is dynamically unstable and relaxes into the planar polar ground state. However, under a field gradient B′, the excited spin state becomes metastable down to a certain threshold qth, and as q decreases below qth its intrinsic dynamical instability is rapidly recalled. The incipient spin excitations in the relaxation dynamics appear with stripe structures, indicating the rotational symmetry breaking by the field gradient. We measure the dependences of qth on B′ and the sample size, and we find that qth is highly sensitive to the field gradient in the vicinity of B′=0, exhibiting power-law behavior of |qth|-B′α with α∼0.5. Our results demonstrate the significance of the field gradient effect in the quantum critical dynamics of spinor condensates. © 2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5706
ISSN
2469-9926
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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