Unusual Finite-Temperature Phase Diagram for Semi-hard-core Bosons in Two Dimensions / Konev V. V.,Panov Yu. D.,Korolev A. V.,Moskvin A. S. // JOURNAL OF LOW TEMPERATURE PHYSICS. - 2016. - V. 185, l. 5-6. - P. 680-685.

ISSN/EISSN:

0022-2291 / 1573-7357

Type:

Article

Abstract:

The extended bosonic Hubbard model (EBHM) is a paradigmatic model for the highly topical field of ultracold gases in optical lattices. Using quantum Monte Carlo simulations, we have determined the finite-temperature phase diagram of the EBHM with truncation of the on-site Hilbert space to the three lowest occupation states: n = 0, 1, 2 (semi-hard-core boson Hubbard model) given nearest-neighbor repulsion, however, both positive and negative values of the on-site boson-boson coupling U. This model is equivalent to an anisotropic spin-1 XXZ model () in a magnetic field. In the limit of large negative U (the boson-boson attraction), the model turns into the well-known model of hard-core bosons whose rich phase diagram demonstrates several puzzling features, in particular, signatures of an unusual reentrant behavior with a charge ordering upon increasing the temperature. We have shown that the rise of the correlation parameter U to positive values (the boson-boson repulsion) expectedly leads to a lowering of the temperature of the superfluid transition and unexpectedly to the more and more pronounced ``reentrance{''} effect.

Author keywords:

Semi-hard-core bosons; On-site correlations; Reentrant transition

DOI:

10.1007/s10909-016-1598-5

Web of Science ID:

ISI:000387226100045

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC
Publisher	SPRINGER/PLENUM PUBLISHERS
Address	233 SPRING ST, NEW YORK, NY 10013 USA
Language	English
EISSN	1573-7357
Research-Areas	Physics
Web-of-Science-Categories	Physics, Applied; Physics, Condensed Matter
Author-Email	konefvitbka53@gmail.com
ORCID-Numbers	Panov, Yury/0000-0001-5751-2400 Konev, Vitaliy/0000-0001-7470-6397 Korolev, Aleksandr/0000-0002-5104-3997
Funding-Acknowledgement	Government of the Russian Federation {[}02.A03.21.0006]; Ministry of Education and Science of the Russian Federation {[}1437, 2725]
Funding-Text	The research was supported by the Government of the Russian Federation, Program 02.A03.21.0006, and by the Ministry of Education and Science of the Russian Federation, project Nos. 1437 and 2725.
Number-of-Cited-References	8
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	3
Journal-ISO	J. Low Temp. Phys.
Doc-Delivery-Number	EB2XO