Oriented Polar Molecules in a Solid Inert-Gas Matrix: A Proposed Method for Measuring the Electric Dipole Moment of the Electron

Vutha, Amar C.; Horbatsch, Marko; Hessels, E. A.

doi:10.3390/atoms6010003

Cited by 56 publications

(59 citation statements)

References 48 publications

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“…In 33 Hz/e.cm 2 , respectively. We have seen that their E eff and W s values are smaller than the values reported by our method but for W M , the trend is reversed.…”

Section: Resultsmentioning

confidence: 93%

“…Still, we believe that the nuclear P,T -odd NMQM effect can enhance the EDM of the said molecule to some extent. On the other hand, we have already mentioned above that Vutha et al [33] proposed a new experiment in which HgF could be embedded in a solid matrix of inert gas atoms to measure the eEDM. Thus, HgF can be an experimental candidate in search of new physics.…”

Section: Resultsmentioning

confidence: 99%

“…It has high diagonal Franck-Condon matrix element between the ground and first excited electronic state, which is a characteristic of laser coolable molecule and the corresponding transition frequency between these two states lies in the ultra visible region [32]. Recently, Vutha et al [33] proposed an experiment in which polar molecules such as HgF could be embedded in a solid matrix of inert gas atoms to measure the eEDM. On the other hand, Kozlov [34,35] studied the P, T -odd interactions in HgF using the relativistic semiempirical method.…”

Section: Introductionmentioning

confidence: 99%

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Relativistic coupled-cluster investigation of parity (P) and time-reversal (T ) symmetry violations in HgF

Talukdar

Nayak

Vaval

et al. 2019

The Journal of Chemical Physics

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We employ the Z-vector method in the four-component relativistic coupled-cluster framework to calculate the parity (P) and time-reversal (T ) symmetry violating scalar-pseudoscalar (S-PS) nucleus-electron interaction constant (Ws), the effective electric field (E eff ) experienced by the unpaired electron and the nuclear magnetic quadrupole moment (NMQM)-electron interaction constant (WM) in the open-shell ground electronic state of HgF. The molecular frame dipole moment and the magnetic hyperfine structure (HFS) constant of the molecule are also calculated at the same level of theory. The outcome of our study is that HgF has a high value of E eff (115.9 GV/cm), Ws (266.4 kHz) and WM (3.59 × 10 33 Hz/e.cm 2 ), which shows that it can be a possible candidate for the search of new physics beyond the Standard model. Our results are in good agreement with the available literature values. Furthermore, we investigate the effect of the basis set and that of the virtual energy functions on the computed properties. The role of the high-energy virtual spinors are found to be significant in the calculation of the HFS constant and the P, T -odd interaction coefficients.

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“…In 33 Hz/e.cm 2 , respectively. We have seen that their E eff and W s values are smaller than the values reported by our method but for W M , the trend is reversed.…”

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relativistic coupled-cluster investigation of parity (P) and time-reversal (T ) symmetry violations in HgF

Talukdar

Nayak

Vaval

et al. 2019

The Journal of Chemical Physics

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“…The location of these contours would shift downwards for higher values of Λ 6 / √ c 6 . All of this parameter space could potentially be probed in future electron EDM searches [38][39][40].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Electroweak baryogenesis from temperature-varying couplings

Ellis

Ipek

White

2019

J. High Energ. Phys.

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The fundamental couplings of the Standard Model are known to vary as a function of energy scale through the Renormalisation Group (RG), and have been measured at the electroweak scale at colliders. However, the variation of the couplings as a function of temperature need not be the same, raising the possibility that couplings in the early universe were not at the values predicted by RG evolution. We study how such temperaturevariance of fundamental couplings can aid the production of a baryon asymmetry in the universe through electroweak baryogenesis. We do so in the context of the Standard Model augmented by higher-dimensional operators up to dimension 6.

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“…This will enable greater resolution in EPR spectroscopy, and is of use for improving ensemble magnetometry [22,23] and for fundamental physics experiments with atoms and molecules in matrices [24,25]. We note that for these applications, the superposition states we have explored have two advantages: their inhomogenous broadening is reduced and they evolve phase faster than Larmor precession states, limited to a factor of 2F for the stretched states.…”

mentioning

confidence: 99%

Enhanced spin coherence of rubidium atoms in solid parahydrogen

et al. 2019

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We measure the transverse relaxation of the spin state of an ensemble of ground-state rubidium atoms trapped in solid parahydrogen at cryogenic temperatures. We find the spin dephasing time of the ensemble (T * 2 ) is limited by inhomogeneous broadening. We determine that this broadening is dominated by electrostatic interactions with the host matrix, and can be reduced by preparing nonclassical spin superposition states. Driving these superposition states gives significantly narrower electron paramagnetic resonance lines and the longest reported electron spin T * 2 in any solid-phase system other than solid helium.PACS numbers: 07.55. Ge, 33.35.+r Measuring the energy splitting between Zeeman levels is at the heart of atomic magnetometry [1], electron paramagntic resonance (EPR) spectroscopy [2], and fundamental physics measurements [3][4][5]. For an ensemble of N atoms, the shot-noise limited precision of a single measurement is σ E ∼ T * 2 √ N [1], where T * 2 is the ensemble's spin dephasing time. In this paper, we show that rubidium atoms in parahydrogen have favorable T * 2 times for a solid state electron spin ensemble. Moreover, their T * 2 can be further extended by using nonclassical superposition states instead of traditional Larmor precession states.Our apparatus is similar to that described in Refs. [6,7]. We grow our crystal by co-depositing hydrogen and rubidium gases onto a cryogenically-cooled sapphire window at 3 Kelvin. We enrich the parahydrogen fraction of hydrogen by flowing the gas over a cryogenicallycooled catalyst. In the data presented in this paper, the orthohydrogen fraction is < 10 −4 . Typical thicknesses of the doped crystals are ∼ 0.3 mm. We use naturalisotopic-abundance rubidium; typical rubidium densities are on the order of 10 17 cm −3 , or a few ppm.We apply a static "bias" magnetic field (B z ) normal to the surface of the crystal. We polarize the spin state of the implanted Rb atoms by optically pumping the atoms with a circularly-polarized laser. We measure the polarization through circular dichroism, measuring the relative transmission of left-hand-and right-hand-circularlypolarized light (LHC and RHC). We drive transitions between Zeeman states with transverse RF magnetic fields generated by a wire a few mm above the surface of the crystal. We take data with bias fields ranging from 40 to 120 Gauss, giving Zeeman shifts that are small compared to the hyperfine splitting, but sufficiently large that transitions between different Zeeman levels can be spectrally resolved. The level structure of ground-state 85 Rb is shown in Fig. 1. * weinstein@physics.unr.edu; http://www.physics.unr.edu/xap/ We measure rubidium's transverse relaxation time by free-induction-decay (FID) decay measurements. After polarizing the spin through optical pumping, an RF pulse is applied to induce Larmor precession. The Larmor precession and its decay are measured optically via circular dichroism [1]. The measured values of T * 2 are shorter than our spin-echo measurements of T 2 by over an order ...

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Oriented Polar Molecules in a Solid Inert-Gas Matrix: A Proposed Method for Measuring the Electric Dipole Moment of the Electron

Cited by 56 publications

References 48 publications

Relativistic coupled-cluster investigation of parity (P) and time-reversal (T ) symmetry violations in HgF

Relativistic coupled-cluster investigation of parity (P) and time-reversal (T ) symmetry violations in HgF

Electroweak baryogenesis from temperature-varying couplings

Enhanced spin coherence of rubidium atoms in solid parahydrogen

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