Abstract
The spectral and total electron densities of states in two-dimensional FeAs clusters, which simulate iron-based superconductors, have been calculated using the generalized quantum Monte Carlo algorithm within the full two-orbital model. Spectra have been reconstructed by solving the integral equation relating the Matsubara Green’s function and spectral density by the method combining the gradient descent and Monte Carlo algorithms. The calculations have been performed for clusters with dimensions up to 10 × 10 FeAs cells. The profiles of the Fermi surface for the entire Brillouin zone have been presented in the quasiparticle approximation. Data for the total density of states near the Fermi level have been obtained. The effect of the interaction parameter, size of the cluster, and temperature on the spectrum of excitations has been studied.
Similar content being viewed by others
References
Y. Kamihara, T. Watanabe, M. Hirano, and H. Hosono, J. Am. Chem. Soc. 130, 3296 (2008).
Yu. Isyumov and E. Kurmaev, High-Tc Superconductors Based on FeAs Compounds (Springer, Berlin, 2010).
E. Dagotto, Rev. Mod. Phys. 85, 849 (2013).
I. A. Nekrasov and M. V. Sadovskii, JETP Lett. 99, 598 (2014).
V. A. Kashurnikov and A. V. Krasavin, JETP Lett. 97, 333 (2013).
V. A. Kashurnikov and A. V. Krasavin, JETP Lett. 100, 16 (2014).
V. A. Kashurnikov and A. V. Krasavin, Phys. Lett. A 378, 2894 (2014).
A. Moreo, M. Daghofer, J. A. Riera, and E. Dagotto, Phys. Rev. B 79, 134502 (2009).
M. V. Sadovskii, Phys. Usp. 51, 1243 (2008).
M. V. Sadovskii, E. Z. Kuchinskii, and I. A. Nekrasov, J. Magn. Magn. Mater. 324, 3481 (2012).
Y. Wu, G. Liu, and T. Ma, Eur. Phys. Lett. 104, 27013 (2013).
I. A. Nekrasov, Z. V. Pchelkina, and M. V. Sadovskii, JETP Lett. 88, 543 (2008), JETP Lett. 88, 679 (2008).
S. Liang, G. Alvarez, C. Sen, A. Moreo, and E. Dagotto, Phys. Rev. Lett. 109, 047001 (2012).
V. A. Kashurnikov and A. V. Krasavin, Phys. Proc. 65, 21 (2015).
V. A. Kashurnikov and A. V. Krasavin, Phys. Proc. 71, 379 (2015).
K. Haule, J. H. Shim, and G. Kotliar, Phys. Rev. Lett. 100, 226402 (2008).
S. Liang, A. Moreo, and E. Dagotto, Phys. Rev. Lett. 111, 047004 (2013).
T. Ma, H.-Q. Lin, and J. Hu, Phys. Rev. Lett. 110, 107002 (2013).
S. Raghu, X.-L. Qi, Ch.-X. Liu, D. J. Scalapino, and Sh.-Ch. Zhang, Phys. Rev. B 77, 220503(R) (2008).
A. S. Mishchenko, Phys. Usp. 48, 887 (2005).
V. A. Kashurnikov and A. V. Krasavin, Numerical Methods of Quantum Statistics (Fizmatlit, Moscow, 2010), p. 377.
M. V. Medvedev, I. A. Nekrasov, and M. V. Sadovskii, JETP Lett. 95, 33 (2012).
P. D. Johnson, G. Xu, and W.-G. Yin, Iron-Based Superconductivity (Springer, Berlin, 2015).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.A. Kashurnikov, A.V. Krasavin, Ya.V. Zhumagulov, 2016, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 103, No. 5, pp. 378–384.
Rights and permissions
About this article
Cite this article
Kashurnikov, V.A., Krasavin, A.V. & Zhumagulov, Y.V. Electron density of states of Fe-based superconductors: Quantum trajectory Monte Carlo method. Jetp Lett. 103, 334–340 (2016). https://doi.org/10.1134/S0021364016050052
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0021364016050052