Striped ferronematic ground states in a spin-orbit-coupled<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math>Bose gas

Natu, Stefan S.; Li, Xiaopeng; Cole, Wayne S.

doi:10.1103/physreva.91.023608

Cited by 53 publications

(63 citation statements)

References 49 publications

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“…In the presence of antiferromagnetic spin-dependent interactions (g 2 > 0), when the Raman coupling Ω is small, the ground state of the many-body system corresponds to the so-called striped phase [11,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. In this configuration the density profile of the gas exhibits periodic modulations in the form of stripes, which appear as a consequence of the spontaneous breaking of translational invariance.…”

Section: B Many-body Ground Statementioning

confidence: 99%

Optical-lattice-assisted magnetic phase transition in a spin-orbit-coupled Bose-Einstein condensate

Martone

Ozawa

et al. 2016

Phys. Rev. A

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We investigate the effect of a periodic potential generated by a one-dimensional optical lattice on the magnetic properties of an S = 1/2 spin-orbit-coupled Bose gas. By increasing the lattice strength one can achieve a magnetic phase transition between a polarized and an unpolarized Bloch wave phase, characterized by a significant enhancement of the contrast of the density fringes. If the wave vector of the periodic potential is chosen close to the roton momentum, the transition could take place at very small lattice intensities, revealing the strong enhancement of the response of the system to a weak density perturbation. By solving the Gross-Pitaevskii equation in the presence of a three-dimensional trapping potential, we shed light on the possibility of observing the magnetic phase transition in currently available experimental conditions.

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Section: B Many-body Ground Statementioning

confidence: 99%

Optical-lattice-assisted magnetic phase transition in a spin-orbit-coupled Bose-Einstein condensate

Martone

Ozawa

et al. 2016

Phys. Rev. A

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“…Experimentally, spin-orbit coupling for spin-1 Bose-Einstein condensates (BECs) has been realized recently [29,30] and interesting magnetism physics has been observed [31][32][33][34][35]. Mathematically, it is well known that there exist not only spin vectors, but also spin tensors [e.g., irreducible rank-2 spin-quadrupole tensor N ij = (F i F j + F j F i ) /2 − δ ij F 2 /3] in a large spin (≥ 1) system.…”

mentioning

confidence: 99%

Spin-Tensor–Momentum-Coupled Bose-Einstein Condensates

2017

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The recent experimental realization of spin-orbit coupling for ultracold atomic gases provides a powerful platform for exploring many interesting quantum phenomena. In these studies, spin represents spin vector (spin-1/2 or spin-1) and orbit represents linear momentum. Here we propose a scheme to realize a new type of spin-tensor-momentum coupling (STMC) in spin-1 ultracold atomic gases. We study the ground state properties of interacting Bose-Einstein condensates (BECs) with STMC and find interesting new types of stripe superfluid phases and multicritical points for phase transitions. Furthermore, STMC makes it possible to study quantum states with dynamical stripe orders that display density modulation with a long tunable period and high visibility, paving the way for direct experimental observation of a new dynamical supersolid-like state.. Our scheme for generating STMC can be generalized to other systems and may open the door for exploring novel quantum physics and device applications.Introduction.-The coupling between matter and gauge field plays a crucial role for many fundamental quantum phenomena and practical device applications in condensed matter [1][2][3] and atomic physics [4]. A prominent example is the spin-orbit coupling, the coupling between a particle's spin and orbit (e.g., momentum) degrees of freedom, which is responsible for important physics such as topological insulators and superconductors [2,3]. In this context, recent experimental realization of spin-orbit coupling in ultracold atomic gases [5][6][7][8][9][10][11][12][13] opens a completely new avenue for investigating quantum many-body physics under gauge field [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].So far in most works on spin-orbit coupling in solid state and cold atomic systems, the spin degrees of freedom are taken as rank-1 spin vectors F i (i = x, y, z), such as electron spin-1/2 or pseudospins formed by atomic hyperfine states that can be large (e.g., spin-1 or 3/2). Experimentally, spin-orbit coupling for spin-1 Bose-Einstein condensates (BECs) has been realized recently [29,30] and interesting magnetism physics has been observed [31][32][33][34][35]. Mathematically, it is well known that there exist not only spin vectors, but also spin tensors [e.g., irreducible rank-2 spin-quadrupole tensorin a large spin (≥ 1) system. Therefore two natural questions are: i ) Can the coupling between spin tensors of particles and their linear momenta be realized in experiments? ii ) What new physics may emerge from such spin-tensor-momentum coupling (STMC)?In this Letter, we address these two questions by proposing a simple experimental scheme for realizing STMC for spin-1 ultracold atomic gases. Our scheme is based on slight modification of previous experimental setup [29] and is experimentally feasible. The STMC changes the band structure dramatically, leading to interesting new physics in the presence of many-body interactions between atoms. Although both bosons and fermions can be studied, here we only consider spi...

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“…Apart from all these activities, a large number of review articles on the spinor Bose gas exist that emphasizes the studies in presence of disorder, [28,29] external magnetic field through the linear [30][31][32] and quadratic Zeeman strengths, [30,[33][34][35][36] spinorbit couplings (SOC) [37][38][39][40][41] and synthetic magnetic fields [42] etc. Among them, the inclusion of SOC after its recent experimental www.advancedsciencenews.com www.ann-phys.org realization using Raman coupling between hyperfine levels [43] gives rise to more than one minima in the single particle dispersion relation which leads to different exotic ground state structures like plane and standing wave [37] and various striped ferromagnetic phases.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the inclusion of SOC after its recent experimental www.advancedsciencenews.com www.ann-phys.org realization using Raman coupling between hyperfine levels [43] gives rise to more than one minima in the single particle dispersion relation which leads to different exotic ground state structures like plane and standing wave [37] and various striped ferromagnetic phases. [38] Also usages of the hyperfine spin states as short lattice dimension, known as the synthetic dimension, [44] to create spatially varying SOC gives rise to multiple density ordered SF phases such as the charge density or the spin density wave phases. [45] Although the different density ordered SF phases have been proposed for a spin-1 system using SOC, a specific concern is the possibility to study also the charge density wave (CDW) Mott insulating phase by employing a spin-1 BHM with non local nearest neighbour extended interactions apart from the usual onsite interaction, that may help in realizing the CDW phase.…”

Section: Introductionmentioning

confidence: 99%

Spin‐1 Bose Hubbard Model with Nearest Neighbour Extended Interaction

Nabi

Basu

2017

Annalen der Physik

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A spinor (F = 1) Bose gas is studied in presence of a density-density interaction through a mean field approach and a perturbation theory for either sign of the spin dependent interaction, namely the antiferromagnetic (AF) and the ferromagnetic cases. In the AF case, the charge density wave (CDW) phase appears to be sandwiched between the Mott insulating (MI) and the supersolid phases for small values of the extended interaction strength. But the CDW phase completely occupies the MI lobe when the extended interaction strength is larger than a certain critical value related to the width of the MI lobes and hence opens up the possibilities of spin singlet and nematic CDW insulating phases. In the ferromagnetic case, the phase diagram shows similar features as that of the AF case and are in complete agreement with a spin-0 Bose gas. The perturbation expansion calculations nicely corroborate the mean field phase results in both these cases. Further, we extend our calculations in presence of a harmonic confinement and obtained the momentum distribution profile that is related to the absorption spectra in order to distinguish between different phases.

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Striped ferronematic ground states in a spin-orbit-coupledS=1Bose gas

Cited by 53 publications

References 49 publications

Optical-lattice-assisted magnetic phase transition in a spin-orbit-coupled Bose-Einstein condensate

Optical-lattice-assisted magnetic phase transition in a spin-orbit-coupled Bose-Einstein condensate

Spin-Tensor–Momentum-Coupled Bose-Einstein Condensates

Spin‐1 Bose Hubbard Model with Nearest Neighbour Extended Interaction

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