Low-energy effective theory for spin dynamics of fluctuating stripes

Research output: Contribution to journalArticle

Abstract

We derive an effective Hamiltonian for spin dynamics of fluctuating smectic stripes from the t-J model in the weak coupling limit t J. Besides the modulation of spin magnitude, the high energy hopping term would induce a low-energy antiferromagnetic interaction between two neighboring "blocks of spins." Based on the effective Hamiltonian, we applied the linear spin-wave theory and found that the spin-wave velocity is almost isotropic for La2-xSrxCuO4 unless the structural effect is considered. The intensity of the second harmonic mode is found to be about 10% to that of the fundamental mode.

Original languageEnglish
Article number184516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number18
DOIs
Publication statusPublished - 2005 Nov 1

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Spin dynamics
Hamiltonians
Spin waves
spin dynamics
magnons
Modulation
harmonics
modulation
energy
interactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Low-energy effective theory for spin dynamics of fluctuating stripes",
abstract = "We derive an effective Hamiltonian for spin dynamics of fluctuating smectic stripes from the t-J model in the weak coupling limit t J. Besides the modulation of spin magnitude, the high energy hopping term would induce a low-energy antiferromagnetic interaction between two neighboring {"}blocks of spins.{"} Based on the effective Hamiltonian, we applied the linear spin-wave theory and found that the spin-wave velocity is almost isotropic for La2-xSrxCuO4 unless the structural effect is considered. The intensity of the second harmonic mode is found to be about 10{\%} to that of the fundamental mode.",
author = "Cheng, {Chi Ho}",
year = "2005",
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language = "English",
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journal = "Physical Review B-Condensed Matter",
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Low-energy effective theory for spin dynamics of fluctuating stripes. / Cheng, Chi Ho.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 18, 184516, 01.11.2005.

Research output: Contribution to journalArticle

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N2 - We derive an effective Hamiltonian for spin dynamics of fluctuating smectic stripes from the t-J model in the weak coupling limit t J. Besides the modulation of spin magnitude, the high energy hopping term would induce a low-energy antiferromagnetic interaction between two neighboring "blocks of spins." Based on the effective Hamiltonian, we applied the linear spin-wave theory and found that the spin-wave velocity is almost isotropic for La2-xSrxCuO4 unless the structural effect is considered. The intensity of the second harmonic mode is found to be about 10% to that of the fundamental mode.

AB - We derive an effective Hamiltonian for spin dynamics of fluctuating smectic stripes from the t-J model in the weak coupling limit t J. Besides the modulation of spin magnitude, the high energy hopping term would induce a low-energy antiferromagnetic interaction between two neighboring "blocks of spins." Based on the effective Hamiltonian, we applied the linear spin-wave theory and found that the spin-wave velocity is almost isotropic for La2-xSrxCuO4 unless the structural effect is considered. The intensity of the second harmonic mode is found to be about 10% to that of the fundamental mode.

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