Comment on “New Limit on Lorentz-Invariance- and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi><mml:mi>T</mml:mi></mml:math>-Violating Neutron Spin Interactions Using a Free-Spin-Precession<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>He</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow><mml:

Romalis, Michael; Sheng, Dong; Saam, B.; Walker, Thad

doi:10.1103/physrevlett.113.188901

Cited by 25 publications

(18 citation statements)

References 9 publications

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“…This is roughly 1% of the classical dipolar field created by uniform magnetization [1]. We can also estimate the second-order Bloch-Siegert shift created by the counter-rotating component of the dipolar field to be on the order of (0.5µG/5mG) 2 = 10 −8 fractional shift for 3 He.…”

Section: Fig 7 Frequency Ratio Formentioning

confidence: 77%

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
113
2
81
0
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We describe a 3 He-129 Xe comagnetometer using 87 Rb atoms for noble-gas spin polarization and detection. We use a train of 87 Rb π pulses and σ + /σ − optical pumping to realize a finite-field Rb magnetometer with suppression of spin-exchange relaxation. We suppress frequency shifts from polarized Rb by measuring the 3 He and 129 Xe spin precession frequencies in the dark, while applying π pulses along two directions to depolarize Rb atoms. The plane of the π pulses is rotated to suppress the Bloch-Siegert shifts for the nuclear spins. We measure the ratio of 3 He to 129 Xe spin precession frequencies with sufficient absolute accuracy to resolve the Earth's rotation without changing the orientation of the comagnetometer. A frequency resolution of 7 nHz is achieved after integration for 8 hours without evidence of significant drift.PACS numbers: 32.30. Dx, 06.30.Gv, 39.90.+d Spin comagnetometers first introduced in [1] are used for several types of fundamental physics experiments, such as tests of Lorentz, CP and CPT symmetries [2][3][4][5] and searches for spin-dependent forces [6][7][8][9][10]. They also have practical applications as inertial rotation sensors [11][12][13][14][15][16]. When two different spin ensembles occupy the same volume they experience nearly the same average magnetic field [17]. The ratio of their spin precession frequencies f r = ω He /ω Xe can then be used to measure the inertial rotation rate Ω or a spin coupling beyond the Standard Model b:( 1) where B 0 is the bias field alongẑ and γ He , γ Xe are the gyromagnetic ratios for 3 He and 129 Xe, which are well known [18]. Since I = 1/2 nuclear spins are free from quadrupolar energy shifts [19], f r provides an absolute measure of non-magnetic spin interactions-this is particularly important in searches for spin-gravity coupling [20] (where the interaction is hard to modulate), and for use as a gyroscope.An alkali-metal magnetometer provides a natural way to detect nuclear-spin signals because Rb atoms are already used to polarize the nuclear spins by spin-exchange collisions; these collisions enhance the classical dipolar field from the nuclear magnetization by a factor κ 0 [21], which is about 5 for Rb-3 He [22] and 500 for Rb-Xe [23]. However, the presence of polarized Rb atoms also causes large noble-gas frequency shifts that affect the accuracy of Eq. (1). In the past, these frequency shifts have been avoided in 3 He-129 Xe comagnetometers by detecting a smaller dipolar field outside of an alkali-free cell using an RF coil [24] or a SQUID magnetometer [25].In this Letter we describe a new method for operating the 3 He-129 Xe comagnetometer using 87 Rb readout with high sensitivity and accuracy. We develop a 87 Rb magnetometer that can operate in a finite magnetic field of about 5 mG while suppressing Rb-Rb spin-exchange relaxation to increase the magnetometer sensitivity. It

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Section: Fig 7 Frequency Ratio Formentioning

confidence: 77%

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
113
2
81
0
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“…This motivates consideration of SERF magnetometers for NMR detection in CASPEr [8]. SERF magnetometers are applied in fundamental symmetry tests [12,14,15,16,17];…”

Section: Introductionmentioning

confidence: 99%

Application of spin-exchange relaxation-free magnetometry to the Cosmic Axion Spin Precession Experiment

Wang

Kimball

Sushkov

et al. 2018

Physics of the Dark Universe

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“…The limit of 3.6 nHz on sidereal frequency variations was extracted on top of µHz-level anomalous frequency variations. The explanation for these variations in terms of self-interactions due to the transverse gas magnetization was controversial [18,19], and as demonstrated here, incorrect. In this paper we present a new technique that allows dynamic control of each component of the nuclear magnetization and use it measure the self-interactions of the 3 He-129 Xe system.…”

mentioning

confidence: 65%

Frequency shifts in noble-gas comagnetometers

et al. 2019

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Polarized nuclei are a powerful tool in nuclear spin studies and in searches for beyond-the-standard model physics. Noble-gas comagnetometer systems, which compare two nuclear species, have thus far been limited by anomalous frequency variations of unknown origin. We studied the self-interactions in a 3 He-129 Xe system by independently addressing, controlling and measuring the influence of each component of the nuclear spin polarization. Our results directly rule out prior explanations of the shifts, and demonstrate experimentally that they can be explained by species dependent self-interactions. We also report the first gas phase frequency shift induced by 129 Xe on 3 He.

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Comment on “New Limit on Lorentz-Invariance- andCPT-Violating Neutron Spin Interactions Using a Free-Spin-PrecessionHe3

Cited by 25 publications

References 9 publications

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
113
2
81
0
View full text Add to dashboard Cite

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
113
2
81
0
View full text Add to dashboard Cite

Application of spin-exchange relaxation-free magnetometry to the Cosmic Axion Spin Precession Experiment

Frequency shifts in noble-gas comagnetometers

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Comment on “New Limit on Lorentz-Invariance- andCPT-Violating Neutron Spin Interactions Using a Free-Spin-PrecessionHe3

Cited by 25 publications

References 9 publications

He3−Xe129 Comagnetometery using Limes1, Sheng2, Romalis3 2018Phys. Rev. Lett.1132810View full textAdd to dashboardCite

He3−Xe129 Comagnetometery using Limes1, Sheng2, Romalis3 2018Phys. Rev. Lett.1132810View full textAdd to dashboardCite

Application of spin-exchange relaxation-free magnetometry to the Cosmic Axion Spin Precession Experiment

Frequency shifts in noble-gas comagnetometers

Contact Info

Product

Resources

About

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
113
2
81
0
View full text Add to dashboard Cite

He3−Xe129 Comagnetometery using
Limes
¹
,
Sheng
²
,
Romalis
³

2018
Phys. Rev. Lett.
113
2
81
0
View full text Add to dashboard Cite