Programme

P.72 -- Poster, VCTP-46

Date: Wednesday, 6 October 2021

Time: 08:30 - 10:00

The possible coexistence of crystalline density modulation and super-fluidity with soft-core bosons in the optical lattice

Oanh Kim Thi Nguyen(1), Long Dinh Dang(2), Cong Thanh Bach(3), Giang Huong Bach(3)*

(1) Electric Power University, 235 Hoang Quoc Viet street, Bac Tu Liem, Hanoi, Vietnam (2) University of Engineering and Technology, Vietnam National University, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam (3) Computational Material Science Labs, Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam

Supersolid is the fantastic state of matter in which the two properties are that crystalline and flow without friction exist together. In the maturing of ultracold atom experiments in an optical lattice, the evidence of supersolid phase is more and more apparent. Stemming from that motivation, we examine the possible phases of soft-core bosons in the optical lattice by applying the Bose - Hubbard model of a two-dimensional square lattice under an application of a periodic external potential to trap the particles into stripe configurations. Using quantum Monte Carlo simulation with Worm algorithm, we have found three different types of charge-density-wave (CDW) orders at commensurate particle densities, which are 1/2, 1, and 3/2, with the support of a pinning potential and on-site repulsive interaction. We also figure out the coexistence of superfluidity and density modulation near the commensurate fillings.

Presenter: Nguyen Oanh