Spin-momentum coupled Bose-Einstein condensates with lattice band pseudospins

Khamehchi, M. A.; Qu, Chunlei; Mossman, Maren; Zhang, Chuanwei; Engels, Peter

doi:10.1038/ncomms10867

Cited by 26 publications

(21 citation statements)

References 42 publications

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“…The fact that no known laws of physics and chemistry preclude biology's use of either of the two chiral systems, a chirally inverted version of a molecular machinery could be reproduced in the laboratory. Furthermore, the spin-momentum coupled Bose-Einstein condensates with lattice band pseudospins [22] may provide a new platform for our study. …”

Section: Conclusion and Prospectsmentioning

confidence: 99%

The Role of Chirality and Helicity between d- and l-Valine Optical Lattices

Wang

Gong

2018

Crystals

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Abstract:With the aim to investigate the role of chirality and helicity between D-and L-valine crystal lattices under Debye temperature 2-20 K, magnetic field dependence of zero-field and 1, 3 and 5 Tesla on the heat capacity were measured. The heat capacities of D-and L-valine crystals were plotted as C p vs. T, C p vs. lnT, C p /T 3 vs. T in the measured temperature. The four C p /T 3 vs. T curves show a split between D-and L-valine from 2 K to 12 K (T << Θ D ) which is due to the strength of magnetic fields. It is absent from 12 K to 20 K, which indicates the Schottky anomaly. The Bose-Einstein peak of the (e-p) condensation temperature is 11.20, 11.32, 11.44, 11.46 K for D-valine, and 11.49, 11.59, 11.73, 11.70 K for L-valine, respectively. This finding leads to a zero-field splitting of a broad maximum associated with the Schottky anomaly below the temperature of 12 K which is demonstrated by (e-p) Bose-Einstein condensation through the hydrogen of peptide bond in the alpha helix at zero momentum space onto D-and L-valine optical lattices.

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Section: Conclusion and Prospectsmentioning

confidence: 99%

The Role of Chirality and Helicity between d- and l-Valine Optical Lattices

Wang

Gong

2018

Crystals

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“…This idea becomes attractive, since using various experimental techniques, spin-orbit-coupled Bose-Einstein condensates (SOC-BECs) of hyperfine states of 87 Rb atoms has been created [15][16][17][18][19][20]. Notice that atoms of s and p bands of the static lattice were considered as pseudospins [21].The main goal of this paper is to show that with properly adjusted SOC, one can satisfy the phase matching conditions for homogeneous one-dimensional SOC-BECs. Importantly, the SOC properties in atomic systems are highly adjustable [22][23][24][25] and the matching conditions reported below are experimentally feasible.…”

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confidence: 99%

“…Inter-atomic interactions are also tunable, most commonly by Feshbach resonance; see reference [26] for the observation of Feshbach resonances for SOC fermions, or reference [27] for observation of partial waves, with nonlinear interactions controlled by the dressing technique. Additional degrees of freedom in manipulating the effective dispersion relation, and thus, of the matching conditions (see (8) and (9) below), may be reached by using moving lattices [17,21].Understanding the dynamics of the FWM process is important in the context of creation of pairs of correlated particles, which are crucial in the ultra-precise metrology. Particles undergoing elastic collisions may create entanglement and it can be of practical use in the experiment.…”

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Four-wave mixing in spin–orbit coupled Bose–Einstein condensates

2020

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We describe possibilities of spontaneous, degenerate four-wave mixing (FWM) processes in spin-orbit coupled Bose-Einstein condensates. Phase matching conditions (i.e., energy and momentum conservation laws) in such systems allow one to identify four different configurations characterized by involvement of distinct spinor states in which such a process can take place. We derived these conditions from first principles and then illustrated dynamics with direct numerical simulations. We found, among others, the unique configuration, where both probe waves have smaller group velocity than pump wave and proved numerically that it can be observed experimentally under proper choice of the parameters. We also reported the case when two different FWM processes can occur simultaneously. The described resonant interactions of matter waves is expected to play an important role in the experiments of BEC with artificial gauge fields. Beams created by FWM processes are an important source of correlated particles and can be used in the experiments testing quantum properties of atomic ensembles. © 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische GesellschaftNew J. Phys. 22 (2020) 053019 N V Hung et almomentum and energy conservation laws. These are often quite demanding constraints depending on the particular form of dispersion relation characteristic for the system under investigation. For instance, in one dimension they cannot be satisfied for a system of cold atoms obeying parabolic dispersion relation and confined to (quasi-)one dimension. The situation can be improved by artificial change of the dispersion law using linear optical lattices [7][8][9] or by the manipulation of the wavenumbers of the matter waves involved in the process by means of nonlinear lattices [10,11]. These modifications introduce the internal texture to the propagation medium, making it inherently inhomogeneous.If a system has a spinor nature, i.e., consists of two subsystems, an alternative way to manipulate the linear properties of the medium, even preserving homogeneity, is to employ coherent coupling of the constituents. In optics, for example, one can satisfy the matching conditions for the FWM of light propagating in homogeneous parity-time (PT )-symmetric coupled waveguides with gain and losses [12]. One can also consider the matching conditions, and thus observation of the FWM in PT -symmetric optical lattices which are available experimentally [13]. And yet another interesting application was demonstrated in multi-component vector solitons consisting of two perpendicular FWM dipole components created by electromagnetically induced gratings [14].A similar situation naturally occurs for spinor Bose-Einstein condensate, where coupling between two atomic states by means of the spin-orbit coupling (SOC) allows one to manipulate the dispersion relation in the presence of external potential. This idea becomes attractive, since using various experimental techniques, spin-orbit-coupled ...

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“…Note added : Recently, the modification of the band structure by the moving lattice has been observed experimentally with a BEC [53].…”

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confidence: 99%

Fulde-Ferrell Superfluids without Spin Imbalance in Driven Optical Lattices

Zheng¹,

Qu²,

Zou³

et al. 2016

Phys. Rev. Lett.

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Spin-imbalanced ultracold Fermi gases have been widely studied recently as a platform for exploring the long-sought Fulde-Ferrell-Larkin-Ovchinnikov superfluid phases, but so far conclusive evidence has not been found. Here we propose to realize an Fulde-Ferrell (FF) superfluid without spin imbalance in a three-dimensional fermionic cold atom optical lattice, where s-and p-orbital bands of the lattice are coupled by another weak moving optical lattice. Such coupling leads to a spin-independent asymmetric Fermi surface, which, together with the s-wave scattering interaction between two spins, yields an FF type of superfluid pairing. Unlike traditional schemes, our proposal does not rely on the spin imbalance (or an equivalent Zeeman field) to induce the Fermi surface mismatch and provides a completely new route for realizing FF superfluids.PACS numbers: 03.75. Ss, 74.20.Fg The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, characterized by Cooper pairs with finite center-of-mass momenta [1,2], is a central concept for understanding many exotic phenomena in different physics branches [3]. A crucial ingredient for realizing FFLO states is a large Zeeman field that induces a Fermi surface mismatch of two paired spins [1,2]. In recent years, FFLO states have been extensively studied in ultracold Fermi gases, where the population imbalance between two atomic internal states (pseudo-spins) serves as an effective Zeeman field [4][5][6][7][8][9][10][11][12][13][14]. Despite the intrinsic advantages of cold atoms compared to their solid state counterparts, conclusive evidence of FFLO states has not been found yet because of various obstacles. For instance, a large Zeeman field suppresses the superfluid order parameter, leading to a very narrow parameter region for FFLO states in 2D or 3D which can be easily destroyed by thermodynamic fluctuations [4][5][6]. In 1D, the parameter region for FFLO states could be large, but the quantum fluctuation is strong [7,12,14]. The recently proposed schemes using spin-orbit coupling and in-plane Zeeman field in a 3D Fermi gas may potentially overcome these obstacles [15][16][17][18][19][20][21] in principle, but they face practical experimental issues such as the large spontaneous photon emission from the near-resonant Raman lasers [22][23][24][25][26][27][28][29][30][31] and the strong three-body loss at Feshbach resonance in the presence of spin-orbit coupling [23][24][25][26].In this Letter, we propose a new route for realizing FF superfluids in ultracold Fermi gases without involving population imbalance of two spin states that interact for generating Cooper pairing. Instead, we induce an asymmetric Fermi surface for the generation of FF states by other means and the populations of the two spins are fully equal. Our main results are the following: 1) We show that the s-and p x -orbital bands of a 3D static optical lattice can be coupled using a weak 1D moving optical lattice along the x direction, which can be generated by two counter-propagating lasers with the frequency differ...

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Spin-momentum coupled Bose-Einstein condensates with lattice band pseudospins

Cited by 26 publications

References 42 publications

The Role of Chirality and Helicity between d- and l-Valine Optical Lattices

The Role of Chirality and Helicity between d- and l-Valine Optical Lattices

Four-wave mixing in spin–orbit coupled Bose–Einstein condensates

Fulde-Ferrell Superfluids without Spin Imbalance in Driven Optical Lattices

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