Výsledky vyhledávání - "Morgenstern, I"

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Dynamical mean-field driven spinor condensate physics beyond the single-mode approximation

Autor: Jie, J., Zhong, S., Zhang, Q., Morgenstern, I., Ooi, H. G., Guan, Q., Bhagat, A., Nematollahi, D., Schwettmann, A., Blume, D.

Publikováno v: Physical Review A 107, 053309 (2023)

$^{23}$Na spin-1 Bose-Einstein condensates are used to experimentally demonstrate that mean-field physics beyond the single-mode approximation can be relevant during the non-equilibrium dynamics. The experimentally observed spin oscillation dynamics

Externí odkaz: http://arxiv.org/abs/2301.06461

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Evidence for d-wave superconductivity in the repulsive Hubbard-model

Autor: Fettes, W., Morgenstern, I.

We perform numerical simulations of the Hubbard model using the projector Quantum Monte Carlo method. A novel approach for finite size scaling is discussed. We obtain evidence in favor of d-wave superconductivity in the repulsive Hubbard model. For U

Externí odkaz: http://arxiv.org/abs/cond-mat/9801227

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Parallelization of the exact diagonalization of the t-t'-Hubbard model

Autor: Fettes, W., Morgenstern, I., Husslein, T.

We present a new parallel algorithm for the exact diagonalization of the $t-t'$-Hubbard model with the Lanczos-method. By invoking a new scheme of labeling the states we were able to obtain a speedup of up to four on 16 nodes of an IBM SP2 for the ca

Externí odkaz: http://arxiv.org/abs/cond-mat/9709336

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Quantum Monte Carlo Evidence for d-wave Pairing in the 2D Hubbard Model at a van Hove Singularity

Autor: Husslein, T., Morgenstern, I., Newns, D. M., Pattnaik, P. C., Singer, J. M., Matuttis, H. G.

We implement a Quantum Monte Carlo calculation for a repulsive Hubbard model with nearest and next-nearest neighbor hopping interactions on clusters up to 12x12. A parameter region where the Fermi level lies close to the van Hove singularity at the S

Externí odkaz: http://arxiv.org/abs/cond-mat/9608030

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