Magnetic order, Bose-Einstein condensation, and superfluidity in a bosonic t-J model of CP{sup 1} spinons and doped Higgs holons

Journal Article · Thu Oct 01 00:00:00 EDT 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.80.144510· OSTI ID:21294408

Aoki, Koji; Ichinose, Ikuo ^[1]; Sakakibara, Kazuhiko ^[2]; Matsui, Tetsuo ^[3]

---

1. Department of Applied Physics, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan)
2. Department of Physics, Nara National College of Technology, Yamatokohriyama 639-1080 (Japan)
3. Department of Physics, Kinki University, Higashi-Osaka 577-8502 (Japan)

We study the three-dimensional U(1) lattice gauge theory of a CP{sup 1} spinon (Schwinger boson) field and a Higgs field. It is a bosonic t-J model in slave-particle representation, describing the antiferromagnetic (AF) Heisenberg spin model with doped bosonic holes expressed by the Higgs field. The spinon coupling term of the action favors AF long-range order, whereas the holon hopping term in the ferromagnetic channel favors Bose-Einstein condensation (BEC) of holons. We investigate the phase structure by means of Monte Carlo simulations and study an interplay of AF order and BEC of holes. We consider the two variations in the model; (i) the three-dimensional model at finite temperatures, and (ii) the two-dimensional model at vanishing temperature. In the model (i) we find that the AF order and BEC coexist at low temperatures and certain hole concentrations. In the model (ii), by varying the hole concentration and the stiffness of AF spin coupling, we find a phase diagram similar to the model (i). Implications of the results to systems of cold atoms and the fermionic t-J model of strongly correlated electrons are discussed.

• OSTI ID: 21294408
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 80, Issue 14; Other Information: DOI: 10.1103/PhysRevB.80.144510; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
ATOMS
BOSE-EINSTEIN CONDENSATION
COMPUTERIZED SIMULATION
COUPLING
CP INVARIANCE
DENSITY
DOPED MATERIALS
ELECTRON CORRELATION
FERMIONS
FERROMAGNETISM
FLEXIBILITY
GAUGE INVARIANCE
HEISENBERG MODEL
HIGGS BOSONS
HIGGS MODEL
HOLES
LATTICE FIELD THEORY
MAGNETIC PROPERTIES
MONTE CARLO METHOD
PHASE DIAGRAMS
SPIN
SUPERFLUIDITY
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS
U-1 GROUPS
VARIATIONS