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3 results on '"GROUND STATE WAVEFUNCTIONS"'

1. Spin-orbit entangled j= 12 moments in Ba2CeIrO6: A frustrated fcc quantum magnet

Author

Revelli, A., Loo, C. C., Kiese, D., Becker, P., Fröhlich, T., Lorenz, T., Moretti, Sala, M., Monaco, G., Buessen, F. L., Attig, J., Hermanns, M., Streltsov, S. V., Khomskii, D. I., Van, Den, Brink, J., Braden, M., Van, Loosdrecht, P. H. M., Trebst, S., Paramekanti, A., Grüninger, M., Revelli, A., Loo, C. C., Kiese, D., Becker, P., Fröhlich, T., Lorenz, T., Moretti, Sala, M., Monaco, G., Buessen, F. L., Attig, J., Hermanns, M., Streltsov, S. V., Khomskii, D. I., Van, Den, Brink, J., Braden, M., Van, Loosdrecht, P. H. M., Trebst, S., Paramekanti, A., and Grüninger, M.

Abstract

We establish the double perovskite Ba2CeIrO6 as a nearly ideal model system for j=1/2 moments, with resonant inelastic x-ray scattering indicating that the ideal j=1/2 state contributes by more than 99% to the ground-state wave function. The local j=1/2 moments form an fcc lattice and are found to order antiferromagnetically at TN=14K, more than an order of magnitude below the Curie-Weiss temperature. Model calculations show that the geometric frustration of the fcc Heisenberg antiferromagnet is further enhanced by a next-nearest neighbor exchange, and a significant size of the latter is indicated by ab initio theory. Our theoretical analysis shows that magnetic order is driven by a bond-directional Kitaev exchange and by local distortions via a strong magnetoelastic effect. Both, the suppression of frustration by Kitaev exchange and the strong magnetoelastic effect are typically not expected for j=1/2 compounds making Ba2CeIrO6 a riveting example for the rich physics of spin-orbit entangled Mott insulators. © 2019 American Physical Society.

Published
2019

2. Spin-chain model for strongly interacting one-dimensional Bose-Fermi mixtures

Author

Luis Santos, Stephanie Reimann, Frank Deuretzbacher, Johannes Bjerlin, and Daniel Becker

Subjects
Interaction strength, Ground state, FOS: Physical sciences, Spin dynamics, 01 natural sciences, 010305 fluids & plasmas, Bethe ansatz, symbols.namesake, Bose-Fermi mixtures, Antiferromagnetism, Quantum mechanics, 0103 physical sciences, ddc:530, 010306 general physics, Wave function, Wave functions, Bosons, Boson, Physics, Condensed Matter::Quantum Gases, Condensed matter physics, Exact diagonalization, Chains, Fermion, Spin chain models, Momentum distributions, Antiferromagnetics, Ground state wavefunctions, Noninteracting fermions, Local density approximation, Quantum Gases (cond-mat.quant-gas), Mixtures, symbols, Condensed Matter::Strongly Correlated Electrons, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, Local-density approximation, Hamiltonian (quantum mechanics), Condensed Matter - Quantum Gases
Abstract

Strongly interacting one-dimensional (1D) Bose-Fermi mixtures form a tunable XXZ spin chain. Within the spin-chain model developed here, all properties of these systems can be calculated from states representing the ordering of the bosons and fermions within the atom chain and from the ground-state wave function of spinless noninteracting fermions. We validate the model by means of an exact diagonalization of the full few-body Hamiltonian in the strongly interacting regime. Using the model, we explore the phase diagram of the atom chain as a function of the boson-boson (BB) and boson-fermion (BF) interaction strengths and calculate the densities, momentum distributions, and trap-level occupancies for up to 17 particles. In particular, we find antiferromagnetic (AFM) and ferromagnetic (FM) order and a demixing of the bosons and fermions in certain interaction regimes. We find, however, no demixing for equally strong BB and BF interactions in agreement with earlier calculations that combined the Bethe ansatz with a local-density approximation., See the ancillary files for the Mathematica notebook

Published
2016

3. Spin-chain model for strongly interacting one-dimensional Bose-Fermi mixtures

Author

Deuretzbacher, Frank, Becker, D., Bjerlin, J., Reimann, S.M., Santos, Luis, Deuretzbacher, Frank, Becker, D., Bjerlin, J., Reimann, S.M., and Santos, Luis

Abstract

Strongly interacting one-dimensional (1D) Bose-Fermi mixtures form a tunable XXZ spin chain. Within the spin-chain model developed here, all properties of these systems can be calculated from states representing the ordering of the bosons and fermions within the atom chain and from the ground-state wave function of spinless noninteracting fermions. We validate the model by means of an exact diagonalization of the full few-body Hamiltonian in the strongly interacting regime. Using the model, we explore the phase diagram of the atom chain as a function of the boson-boson (BB) and boson-fermion (BF) interaction strengths and calculate the densities, momentum distributions, and trap-level occupancies for up to 17 particles. In particular, we find antiferromagnetic (AFM) and ferromagnetic (FM) order and a demixing of the bosons and fermions in certain interaction regimes. We find, however, no demixing for equally strong BB and BF interactions, in agreement with earlier calculations that combined the Bethe ansatz with a local-density approximation. © 2017 American Physical Society.

Published
2017

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