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Phases of d-orbital bosons in optical lattices
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.
2015 (English)In: New Journal of Physics, ISSN 1367-2630, Vol. 17, 053004Article in journal (Refereed) Published
Abstract [en]

We explore the properties of bosonic atoms loaded into the d bands of an isotropic square optical lattice. Following the recent experimental success reported in Zhai et al (2013 Phys. Rev. A 87 063638), in which populating d bands with a 99 fidelity was demonstrated, we present a theoretical study of the possible phases that can appear in this system. Using the Gutzwiller ansatz for the three d band orbitals we map the boundaries of the Mott insulating phases. For not too large occupation, two of the orbitals are predominantly occupied, while the third, of a slightly higher energy, remains almost unpopulated. In this regime, in the superfluid phase we find the formation of a vortex lattice, where the vortices come in vortex/anti-vortex pairs with two pairs locked to every site. Due to the orientation of the vortices time-reversal symmetry is spontaneously broken. This state also breaks a discrete -symmetry. We further derive an effective spin-1/2 model that describe the relevant physics of the lowest Mott-phase with unit filling. We argue that the corresponding two dimensional phase diagram should be rich with several different phases. We also explain how to generate anti-symmetric spin interactions that can give rise to novel effects like spin canting.

Place, publisher, year, edition, pages
2015. Vol. 17, 053004
Keyword [en]
cold atoms, optical lattice, phase diagram, spin model
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-170266DOI: 10.1088/1367-2630/17/5/053004ISI: 000355277100004ScopusID: 2-s2.0-84930007874OAI: diva2:831696

QC 20150630

Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2015-08-17Bibliographically approved

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Pinheiro, Fernanda
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