Solitary magnons in one-dimensional ferromagnetic chain

Pushkarov, D. I.; Pushkarov, Kh. I.

doi:10.1016/0375-9601(77)90635-1

Cited by 84 publications

(29 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This observation also excludes a spin entropy effect as a likely origin of the metallic behavior [26]. In analogy to atomic transport in solid 3 He, and noting that the atomic diffusion coefficient is analogous to the inverse resistivity in the electronic QS, we can write the total T in the form [29] …”

Section: Prl 100 016805 (2008) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 92%

“…4(b)]. This suggests inter-quasi-particle scattering in a gas of degenerate defectons as the dominant relaxation mechanism [29]. The deviations from 2 at lowest densities may be explained by the onset of stronger disorder scattering, making it harder to resolve the T 2 component of the resistivity.…”

Section: Prl 100 016805 (2008) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

See 1 more Smart Citation

Low-Temperature Collapse of Electron Localization in Two Dimensions

et al. 2008

View full text Add to dashboard Cite

We report direct experimental evidence that the insulating phase of a disordered, yet strongly interacting two-dimensional electron system becomes unstable at low temperatures. As the temperature decreases, a transition from insulating to metal-like transport behavior is observed, which persists even when the resistivity of the system greatly exceeds the quantum of resistivity h=e 2 . The results have been achieved by measuring transport on a mesoscopic length scale while systematically varying the strength of disorder. DOI: 10.1103/PhysRevLett.100.016805 PACS numbers: 73.21.ÿb, 73.20.Jc, 73.20.Qt Ever since the first two-dimensional electron systems (2DES) were realized, they have been used extensively to investigate various theories and concepts of charge localization [1]. The scaling theory of localization prohibits extended electronic states in two dimensions (2D) at absolute zero in the presence of disorder [2]. While there has been extensive theoretical work on the possibility of a delocalization caused by electron-electron interactions, e.g., [3][4][5][6][7][8][9], conclusive experimental evidence of such an effect has not been observed. On the contrary, the insulating phase in 2D at low temperatures has proven robust, in particular, in the case of strong localization, where the resistivity h=e 2 . For strong disorder, insulating variable-range hopping transport has been observed, with interaction effects leading only to a modification of the single-particle density of states [10]. In low but finite disorder an interaction driven localization mechanism has been suggested in the form of pinned charge-density waves [11,12]. However, no deviation from the insulating nature of transport has been reported in potential realizations of such phases, nor is it expected theoretically. The intermediate regime where disorder and interaction effects are equally important is very challenging to study theoretically and experimentally and is still not well understood. Our work represents an attempt to close this gap.A crucial property of disorder is the characteristic length scale of its potential fluctuations. If the disorder is mainly long range, at low electron densities the system becomes increasingly inhomogeneous. Transport then behaves according to classical percolation law, masking possible interactions between electrons [13]. Hence, an experimental approach for investigating interaction effects in the presence of disorder should minimize the effects of longrange disorder and focus on short-range fluctuations.In modulation doped GaAs=AlGaAs heterojunctions, the disorder mainly comes from the remote charged ions in the doping layer, and the strength of disorder depends strongly on the width of the undoped spacer layer between 2DES and the doping layer. The possibility of changing the strength of disorder by varying provides a powerful tool in the investigation of disorder effects. In theoretical treatment, an entirely random distribution of the dopants is generally assumed, giving a uniform spectral density of...

show abstract

Section: Prl 100 016805 (2008) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 92%

Section: Prl 100 016805 (2008) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Low-Temperature Collapse of Electron Localization in Two Dimensions

et al. 2008

View full text Add to dashboard Cite

show abstract

“…There was the availability of real magnetic compounds which because of extremely small coupling between neighboring chains, could be considered as reasonable realizations of magnetically onedimensional materials. Soliton solutions for classical sine-Gordon chains [2] and Heisenberg chains with various anisotropies [3][4][5][6] were obtained and analyzed. In recent years there is a renewed interest to the topic due to their application.…”

Section: Introductionmentioning

confidence: 99%

“…Bright and dark solitons as exact solutions of the nonlinear Schrödinger (NLS) equation have been studied intensively [3,4,11,12]. Another interesting topic of research with practical importance is the propagation of solitons in coupled parallel chains [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Soliton dynamics in two coupled ferromagnetic chains

Varbev

Primatarowa

Kamburova

2017

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract. The soliton dynamics in a system of two ferromagnetic chains coupled through the interaction between opposite spins is studied. The on-site anisotropy in the chains is also taken into account. The conditions for the existence of different soliton solutions (bright or dark) in the chains are obtained. The system is reduced to a coupled set of discrete equations with complicated coupling interactions which are linear and nonlinear. We investigate the propagation of a soliton excitation launched in one of the chains with a given velocity. The condition for a perfect switch of the soliton is analysed. Numerical simulations have been performed for a variety of the magnetic parameters and the soliton characteristics.

show abstract

“…Bright and dark solitons as exact solutions of the nonlinear Schrödinger (NLS) equation have been studied intensively [3,4,11]. But models describing the physical effects in solids are mainly discrete and the question arises as to how this discreteness modifies the properties of the nonlinear excitations [12,13].…”

Section: Introductionmentioning

confidence: 99%

Dark solitons in ferromagnetic chains with first- and second-neighbor interactions

Primatarowa

Kamburova

2012

Open Physics

View full text Add to dashboard Cite

Abstract:We present a study of the ferromagnetic spin chain with both first-and second-neighbor interactions. We obtain the condition for the appearance and stability of bright and dark solitons for arbitrary wave number in the Brillouin zone. The influence of the second-neighbor interaction and the anisotropy on the soliton properties is considered. The scattering of dark solitons from point defects in the discrete spin chain is investigated numerically.PACS (2008)

show abstract

Solitary magnons in one-dimensional ferromagnetic chain

Cited by 84 publications

References 1 publication

Low-Temperature Collapse of Electron Localization in Two Dimensions

Low-Temperature Collapse of Electron Localization in Two Dimensions

Soliton dynamics in two coupled ferromagnetic chains

Dark solitons in ferromagnetic chains with first- and second-neighbor interactions

Contact Info

Product

Resources

About