Publisher’s Note: Ultracold Fermi Gases with Resonant Dipole-Dipole Interaction [Phys. Rev. Lett. 110, 045301 (2013)]

Shi, Ting-Yun; Zou, S. H.; Hu, Hong Liang; Sun, Cherng-Yuan; Yi, Su

doi:10.1103/physrevlett.112.019904

Cited by 7 publications

(15 citation statements)

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“…Since the low-dimensional dipolar gases may give rise to the strongly correlated states of matter [19,20] and the resonant dipolar Fermi gases may lead to the novel quantum phases [21,22], it is of great interest to study the resonant scatterings of particles with dipole-dipole interaction (DDI) in QLD geometries. The scatterings of dipolar particles in both free and confined spaces have been extensively studied [23][24][25][26][27][28][29][30][31][32][33][34][35].…”

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confidence: 99%

Observing dipolar confinement-induced resonances in quasi-one-dimensional atomic gases

Shi

2014

Phys. Rev. A

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We develop a theoretical framework for the quasi-low-dimensional confinement-induced resonances (CIRs) of particles with the arbitrary three-dimensional two-body interactions, based on the HuangYang pseudopotential and the treatment of Feshbach resonances. Using this new approach, we analytically obtain some universal properties of dipolar CIRs in quasi-one-dimensional (1D) waveguides. We also show that the dipolar CIRs can be induced by tuning the angle between the dipole moments and the waveguide, which is experimentally observable in quasi-1D Cr and Dy atomic gases. We expect that these tilting angle induced CIRs will open up a new simpler way to control the resonant scatterings in quasi-low-dimensional systems. Introduction.-Recently, ultracold gases in quasi-lowdimensional (QLD) geometries have attracted much attention [1][2][3] as the reduced dimensionality leads to rich many-body physics, such as the one-dimensional (1D) Tonks-Girardeau gases [4,5] and the BerezinskiiKosterlitz-Thouless transitions in two-dimensional (2D) gases [6]. Remarkably, the tightly confining traps that define the QLD geometries offer an alternative means for tuning the effective two-body interactions via the confinement-induced resonances (CIRs) [7]. In terms of the Feshbach resonance, the modes of the confining potential provide the open and closed channels for the QLD systems, which are coupled by the two-body interactions. A CIR occurs when the bound state energy induced by the interactions in the closed channels matches the threshold energy of the open channel [8]. Over the past decade, significant progress has been made on the theoretical [8][9][10][11][12][13][14][15] and experimental [16][17][18] studies of the CIRs with isotropic interactions.

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confidence: 99%

Observing dipolar confinement-induced resonances in quasi-one-dimensional atomic gases

Shi

2014

Phys. Rev. A

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“…The effects of the anisotropic dipolar interaction on the fermion many-body physics have been extensively investigated [23]. In particular, this provides the possibility of superfluid pairing between dipolar Fermi atoms in spinless or multicomponent systems [24][25][26][27] at low temperatures. For dipoles aligned parallel to the z direction, a p-wave superfluid state with the dominant p z symmetry was studied in a three-dimensional dipolar Fermi gas [28] and the competition between this superfluidity and nematic charge-density-wave (CDW) was also discussed [29].…”

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confidence: 99%

Weyl Superfluidity in a Three-Dimensional Dipolar Fermi Gas

Liu

Yin

et al. 2015

Phys. Rev. Lett.

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Weyl superconductivity or superfluidity, a fascinating topological state of matter, features novel phenomena such as emergent Weyl fermionic excitations and anomalies. Here we report that an anisotropic Weyl superfluid state can arise as a low temperature stable phase in a 3D dipolar Fermi gas. A crucial ingredient of our model is a direction-dependent two-body effective attraction generated by a rotating external field. Experimental signatures are predicted for cold gases in radio-frequency spectroscopy. The finite temperature phase diagram of this system is studied and the transition temperature of the Weyl superfluidity is found to be within the experimental scope for atomic dipolar Fermi gases.Weyl superfluids or semimetals represent recent developments in generalizing topological phases from gapped to gapless systems (e.g., from topological insulators to semimetals), in condensed matter physics [1,2]. These Weyl states are characterized by the presence of two (or more) gapless Weyl points, which are topologically protected against small perturbations. The Weyl nodes lead to a variety of fascinating phenomena such as unusual surface states [3,4], Hall effects [5,6], and other transport features [7,8]. Finding electronic materials supporting Weyl states has attracted considerable interests [9]. There are many proposed potential candidate materials, such as the pyrochlore iridates [3], topological insulator multilayer structures [7,[10][11][12], as well as certain quasicrystals [13]. However, there is still no compelling experimental evidence for the observation of one. In the field of ultracold atoms, this phase was predicted to appear in spinorbit coupled Fermi gases [14,15]. This line of active research awaits for the future experimental breakthrough of synthesizing higher dimensional artificial spin-orbit coupling with controlled heating [16]. After all, the search for Weyl superconductors remains an open problem for both electronic and ultracold atomic systems.In this letter, we report the emergence of Weyl superfluidity in a 3D single-component dipolar Fermi gas with an effective attraction engineered by a rotating external field. Recently, degenerate dipolar Fermi gases witnessed rapid developments in both magnetic dipolar atoms (such as 167 Er [17,18] and 161 Dy [19,20] atoms) and polar molecules [21,22], stimulating tremendous interests in dipolar effects in many-body phases. The effects of the anisotropic dipolar interaction on the fermion many-body physics have been extensively investigated [23]. In particular, this provides the possibility of superfluid pairing between dipolar Fermi atoms in spinless or multicomponent systems [24][25][26][27] at low temperatures. For dipoles aligned parallel to the z direction, a p-wave superfluid state with the dominant p z symmetry was studied in a three-dimensional dipolar Fermi gas [28] and the competition between this superfluidity and nematic charge-density-wave (CDW) was also discussed [29]. For a dipolar Fermi gas confined in a 2D plane, superfluid states o...

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“…The dispersion of the collective zero sound mode is also anisotropic: the zero sound mode can only propagate in a certain range of the solid angle direction, and its sound velocity is maximal if the propagation direction is along the north or south poles 34,36 . The anisotropy of the electric dipolar interaction also results in unconventional Cooper pairing symmetries 28,29,[44][45][46][47][48][49][50][51][52][53][54] . The electric dipolar interaction is neither purely attractive nor purely repulsive.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, for the single component case, the pairing symmetry is mostly of p z -like slightly hybridized with even higher odd partial wave components 28,29,44,45 . The pairing structure of the two-component dipolar fermions is even more interesting, which allows both the s + d-wave channel singlet and the p z -wave triplet pairings 50,52,53,55 . The dipolar interaction induced triplet pairing is to first order in interaction strength.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the progress on topics of strong correlation physics with dipolar fermions [67][68][69] , the Feshbach resonance with dipo-lar fermions 52,53 , the synthetic gauge field with dipolar fermions 70,71 , and the engineering of exotic and topological many-body states [72][73][74] . Some of these progresses have been excellently reviewed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Unconventional symmetries of Fermi liquid and Cooper pairing properties with electric and magnetic dipolar fermions

2014

J. Phys.: Condens. Matter

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The rapid experimental progress of ultra-cold dipolar fermions opens up a whole new opportunity to investigate novel many-body physics of fermions. In this article, we review theoretical studies of the Fermi liquid theory and Cooper pairing instabilities of both electric and magnetic dipolar fermionic systems from the perspective of unconventional symmetries. When the electric dipole moments are aligned by the external electric field, their interactions exhibit the explicit d r 2 −3z 2 anisotropy. The Fermi liquid properties, including the single-particle spectra, thermodynamic susceptibilities, and collective excitations, are all affected by this anisotropy. The electric dipolar interaction provides a mechanism for the unconventional spin triplet Cooper pairing, which is different from the usual spin-fluctuation mechanism in solids and the superfluid 3 He. Furthermore, the competition between pairing instabilities in the singlet and triplet channels gives rise to a novel time-reversal symmetry breaking superfluid state. Unlike electric dipole moments which are induced by electric fields and unquantized, magnetic dipole moments are intrinsic proportional to the hyperfine-spin operators with a Lande factor. Its effects even manifest in unpolarized systems exhibiting an isotropic but spin-orbit coupled nature. The resultant spin-orbit coupled Fermi liquid theory supports a collective sound mode exhibiting a topologically non-trivial spin distribution over the Fermi surface. It also leads to a novel p-wave spin triplet Cooper pairing state whose spin and orbital angular momentum are entangled to the total angular momentum J = 1 dubbed the J-triplet pairing. This J-triplet pairing phase is different from both the spin-orbit coupled 3 He-B phase with J = 0 and the spin-orbit decoupled 3 He-A phase.

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Publisher’s Note: Ultracold Fermi Gases with Resonant Dipole-Dipole Interaction [Phys. Rev. Lett. 110, 045301 (2013)]

Cited by 7 publications

References 0 publications

Observing dipolar confinement-induced resonances in quasi-one-dimensional atomic gases

Observing dipolar confinement-induced resonances in quasi-one-dimensional atomic gases

Weyl Superfluidity in a Three-Dimensional Dipolar Fermi Gas

Unconventional symmetries of Fermi liquid and Cooper pairing properties with electric and magnetic dipolar fermions

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