Topological phase separation in a two-dimensional quantum lattice Bose-Hubbard system away from half-filling / Moskvin AS // PHYSICAL REVIEW B. - 2004. - V. 69, l. 21.

ISSN/EISSN:

2469-9950 / 2469-9969

Type:

Article

Abstract:

We suppose that the doping of the two-dimensional (2D) hard-core (hc) boson system away from half-filling may result in the formation of a multicenter topological inhomogeneity (defect), such as charge order (CO) bubble domain(s) with Bose superfluid (BS) and extra bosons both localized in domain wall(s), or else in a topological CO+BS phase separation rather than a uniform mixed CO+BS supersolid phase. Starting from the classical model, we predict the properties of the respective quantum system. The long-wavelength behavior of the system is believed to be reminiscent of that of granular superconductors, charge-density wave materials, Wigner crystals, and multi-Skyrmion systems akin to the quantum Hall ferromagnetic state of a 2D electron gas. To elucidate the role played by quantum effects and that of the lattice discreteness, we have addressed the simplest nanoscopic counterpart of the bubble domain in the checkerboard CO phase of a 2D hc Bose-Hubbard (BH) square lattice. It is shown that the relative magnitude and symmetry of a multicomponent order parameter are mainly determined by the sign of the nearest-neighbor and next-nearest-neighbor transfer integrals. In general, the topologically inhomogeneous phase of the hc-BH system away from the half-filling can exhibit the signatures of the s, d, and p symmetries of the off-diagonal order.

Author keywords:

SINGLET-TRIPLET MAGNETISM; SUPERCONDUCTIVITY; GAS; ANTIFERROMAGNETS; FLUCTUATIONS; TEMPERATURE; SUPERFLUID; SKYRMIONS; STATES; ORDER

DOI:

10.1103/PhysRevB.69.214505

Web of Science ID:

ISI:000222530200088

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUN
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	214505
EISSN	2469-9969
Keywords-Plus	SINGLET-TRIPLET MAGNETISM; SUPERCONDUCTIVITY; GAS; ANTIFERROMAGNETS; FLUCTUATIONS; TEMPERATURE; SUPERFLUID; SKYRMIONS; STATES; ORDER
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Number-of-Cited-References	39
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	6
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	836BO