Local spin structure of large spin fermions

Ho, Tin-Lun; Huang, Biao

doi:10.1103/physreva.91.043601

Cited by 11 publications

(11 citation statements)

References 24 publications

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“…The open-shell lanthanide atoms Dy [28,29] and Er [30,31] are suitable candidates with L = 6 and L = 5, respectively. Moreover, these atoms' large total spine.g., F = 21/2 for 161 Dy [32]-can enable the study of (possibly non-Abelian) spinors coupled to large synthetic gauge fields [27,33]. Though spontaneous emission can be eliminated, the strong dipole-dipole interaction (DDI) between these highly magnetic, large-spin atoms induces decay from metastable Zeeman levels that leads to heating and trap loss [34][35][36].…”

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confidence: 99%

Long-Lived Spin-Orbit-Coupled Degenerate Dipolar Fermi Gas

2016

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We describe the creation of a long-lived spin-orbit-coupled gas of quantum degenerate atoms using the most magnetic fermionic element, dysprosium. Spin-orbit-coupling arises from a synthetic gauge field created by the adiabatic following of degenerate dressed states comprised of optically coupled components of an atomic spin. Because of dysprosium's large electronic orbital angular momentum and large magnetic moment, the lifetime of the gas is limited not by spontaneous emission from the light-matter coupling, as for gases of alkali-metal atoms, but by dipolar relaxation of the spin. This relaxation is suppressed at large magnetic fields due to Fermi statistics. We observe lifetimes up to 400 ms, which exceeds that of spin-orbit-coupled fermionic alkali atoms by a factor of 10-100, and is close to the value obtained from a theoretical model. Elastic dipolar interactions are also observed to influence the Rabi evolution of the spin, revealing an interacting fermionic system. The long lifetime of this weakly interacting spin-orbit-coupled degenerate Fermi gas will facilitate the study of quantum many-body phenomena manifest at longer timescales, with exciting implications for the exploration of exotic topological quantum liquids. arXiv:1605.03211v2 [cond-mat.quant-gas]

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confidence: 99%

Long-Lived Spin-Orbit-Coupled Degenerate Dipolar Fermi Gas

2016

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“…To access the off-diagonal element of the density matrix, short radio-frequency pulses should be applied, which rotates the spin with ϑ in spin space, and then results in a coupling of all possible spin components, whose magnetic quantum numbers ranges from m = − F , ··· , F . Finally, the Stern-Gerlach method can be used to determine the diagonal element 45 , which contains information of the off-diagonal element because they relate with each other through the rotation matrix.…”

Section: Resultsmentioning

confidence: 99%

Spontaneous separation of large-spin Fermi gas in the harmonic trap: a density functional study

Sun

2016

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The component separation of the trapped large-spin Fermi gas is studied within density functional theory. The ground state and ferromagnetic transition in the gas, with and without the spin mixing collision, are calculated. In the absence of spin mixing, two patterns of separation are observed as the interaction between atoms increases, whereas only one of them corresponds to a ferromagnetic transition. The phase diagram suggests that the pattern which the system chooses depends on the interaction strength in the collision channels. With the presence of spin mixing, the distribution of phase region changes because of the interplay between different collision channels. Specifically, the spin exchange benefits the FM transition, while it suppresses the component separation of CS-II pattern.

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“…The engineering of synthetic coupling involving the particle's spin, such as spin-spin or spin-orbit coupling, opens the door to the realisation of exotic states such as, on the many-body level, topological superfluids [145][146][147][148][149][150][151][152] as well as highly nonclassical or topological spin states [153][154][155][156], that can even be produced at the singleatom level for large-spin atoms. Spin-dependent light shifts or optical Raman dressing of internal spin states may be used to effect such coupling for the introduction of abelian (magnetic field-like) or non-abelian (spinorbit coupling-like) gauge fields [157,158].…”

Section: Light-induced Coupling Of Spins In Magnetic Atomsmentioning

confidence: 99%