A spin polaron in a two-dimensional antiferromagnet: From a local singlet to a complex quasiparticle

Барабанов, А. Ф.; Mikheenkov, A. V.; Belemuk, A. M.

doi:10.1134/1.1466487

Cited by 12 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…in models with one [14][15][16][17], two [18][19][20], three [21], or more [22,23] bands. While exact analytical solutions seem to be out of reach, numerical studies are always carried out with compromises such as the use of small clusters and variational approaches [24].…”

Section: Microscopic Hole-afm Interactions Have Been Studiedmentioning

confidence: 99%

See 1 more Smart Citation

High-Spin Polaron in Lightly DopedCuO2Planes

2011

View full text Add to dashboard Cite

We derive and investigate numerically a minimal yet detailed spin-polaron model that describes lightly doped CuO2 layers. The low-energy physics of a hole is studied by total-spin-resolved exact diagonalization on clusters of up to 32 CuO2 unit cells, revealing features missed by previous studies. In particular, spin-polaron states with total spin 3/2 are the lowest eigenstates in some regions of the Brillouin zone. In these regions, and also at other points, the quasiparticle weight is identically zero indicating orthogonal states to those represented in the one electron Green's function. This highlights the importance of the proper treatment of spin fluctuations in the many-body background.

show abstract

Section: Microscopic Hole-afm Interactions Have Been Studiedmentioning

confidence: 99%

“…Microscopic hole-AFM interactions have been studied in models with one [14][15][16][17], two [18][19][20], three [21], or more [22,23] bands. While exact analytical solutions seem to be out of reach, numerical studies are always carried out with compromises [24].…”

mentioning

confidence: 99%

High-Spin Polaron in Lightly DopedCuO2Planes

2011

View full text Add to dashboard Cite

show abstract

“…0h ). (17) Given that N -dependent scaling is impossible because N = 16 clusters have a different ground state (e.g. at momentum (0, π) instead of (π, π)), 24 and that a larger cluster cannot currently be solved, we estimate a reasonable lower bound for the binding energy by considering the one-and two-hole energies at fixed concentration n N = 2 32 = 1 16 ,…”

Section: Resultsmentioning

confidence: 99%

“…Such a theoretical or computational description is challenging because of the strongly-correlated many-body nature of the system. Microscopic hole-AFM interactions have been studied in models with one, [12][13][14][15][16][17][18][19] two, [20][21][22][23][24][25][26][27] three, [28][29][30][31] or more [32][33][34][35][36][37][38] bands. While exact analytical solutions seem to be out of reach, numerical studies are also carried out with various compromises, such as the use of small clusters, variational approaches, and/or modeling of the AFM state as a classical Néel state plus spinwaves.…”

Section: Introductionmentioning

confidence: 99%

Computational approach to a doped antiferromagnet: Correlations between two spin polarons in the lightly doped CuO2plane

2011

View full text Add to dashboard Cite

We extend the methods recently introduced in Phys. Rev. Lett. 106 036401 (2011) to investigate correlations between two spin-polarons in a quasi-two-dimensional CuO2 layer. The low-energy wavefunctions for two doped holes introduced in a half-filled CuO2 plane with 32 copper and 64 oxygen sites are calculated explicitly using an efficient yet accurate truncation scheme to model the antiferromagnet background. The energetics and wavefucntions show that the charges form three-spin polarons and the spin is carried by a disturbance around the three-spin polaron core. The low-energy band results from the competition between the kinetic energy and a local attractive potential which favors d x 2 −y 2 states. Lastly, we point out features that are expected to be robust for larger systems.

show abstract

“…The point is that strong interaction between charge carriers and the spin subsystem leads to the 'dressing' of bare carrier (electron or hole) by spin excitations and significant modification of bare energy spectrum. 'Dressed' carrier is a complex quasiparticle called spin polaron [20], which can be considered as a superposition of the states of bare hole and spin excitations. In this case, when solving the Boltzmann equation, it is inevitably necessary to use the multi-moment approximation.…”

Section: Introductionmentioning

confidence: 99%

Electrical resistivity and the Hall effect in the doped Mott-Hubbard material with strong spin-charge coupling

Korovushkin

2023

Phys. Scr.

View full text Add to dashboard Cite

The kinetic characteristics of the doped Mott-Hubbard material are considered within the realistic spin-fermion model which takes into account the strong spin-charge coupling. The kinetic equation constructed on the basis of the mechanism of carrier scattering on the spin fluctuations is solved using the multi-moment method, which allows one to analyze the temperature behavior of nonequilibrium distribution function in the problems of electrical resistivity ρ and the Hall coefficient R H . The calculated dependences ρ(T) and R H (T) for the underdoped and optimally doped regimes demonstrate good qualitative agreement with the experimental data. In particular, the Hall coefficient calculated for the underdoped regime reproduces the experimentally observed sharp drop and even a change in sign at low temperatures.

show abstract

A spin polaron in a two-dimensional antiferromagnet: From a local singlet to a complex quasiparticle

Cited by 12 publications

References 25 publications

High-Spin Polaron in Lightly DopedCuO2Planes

High-Spin Polaron in Lightly DopedCuO2Planes

Computational approach to a doped antiferromagnet: Correlations between two spin polarons in the lightly doped CuO2plane

Electrical resistivity and the Hall effect in the doped Mott-Hubbard material with strong spin-charge coupling

Contact Info

Product

Resources

About