Alternating-domain supersolids in binary dipolar condensates

Abstract

Two-component dipolar condensates are now experimentally producible, and we theoretically investigate the nature of supersolidity in this system. We predict the existence of a binary supersolid state in which the two components form a series of alternating domains, producing an immiscible double supersolid. Remarkably, we find that a dipolar component can even induce supersolidity in a nondipolar component. In stark contrast to single-component supersolids, the number of crystal sites is not strictly limited by the condensate populations, and the density is hence substantially lower. Our results are applicable to a wide range of dipole moment combinations, marking an important step towards long-lived bulk-supersolidity.

Stability of a flattened dipolar binary condensate: emergence of the spin roton

“…This is also a regime where a domain-supersolid can develop in which the two components form a series of alternating domains, producing an immiscible double supersolid (e.g. see [12,13]). Interestingly, this can occur at lower densities where the quantum fluctuation effects are not significant and loss rates will be much lower.…”

“…related work on degenerate fermionic mixtures [5,6]). The case of a two-component (binary) magnetic superfluid has been the subject of theoretical proposals for a new class of quantum droplet states [7][8][9] and supersolid phases [10][11][12][13]. The interplay of immiscibility and the long-ranged interactions has been the subject of investigations exploring pattern formation and novel instabilities [14,15].…”

Control of $^{164}$Dy Bose-Einstein condensate phases and dynamics with dipolar anisotropy

“…On the other hand, the background density of a SS becomes gradually denser for larger φ, thus destroying its SS nature 2 and finally establishing a SF state 3 . Notice that the transition boundary from a SF to a SS can also be determined from the socalled contrast, C = (n max − n min )/(n max + n min ), where n max and n min are the neighbouring density maxima and minima, respectively [77]. Namely, a SF state occurs for C = 0, while C = 0 corresponds to a density modulated state.…”