Intrinsic plasmarons in warm graphene

Liu, Daqing; Chen, Shuyue; Zhang, Shengli; Ma, Ning

doi:10.1088/1361-648x/aa81ad

Cited by 4 publications

(4 citation statements)

References 34 publications

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“…This is an electron-boson interaction similar to that considered in the context of electron-phonon or electron-magnon scattering. Such an interaction has been anticipated by Lundqvist [54,55], and observed in quasi-freestanding graphene by angle-resolved photoemission spectroscopy (ARPES) [56], what's more, intrinsic 'plasmaron' also appear in warm graphene [57]. The 'plasmaron' feature in quasi-freestanding graphene and warm graphene share some similarities, such as: in the larger x = q/T region, the 'plasmaron' energy is always below the fermion energy; and the 'plasmaron' and fermion are the same at q = 0.…”

Section: Resultsmentioning

confidence: 71%

Revealing ‘plasmaron’ feature in DySb by optical spectroscopy study

Ban¹,

Wu²,

Xu³

et al. 2019

J. Phys.: Condens. Matter

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We report magnetic susceptibility, resistivity and optical spectroscopy study on single crystal sample DySb. It exhibits extremely large magnetoresistance (XMR), and a magnetic phase transition from paramagnetic (PM) to antiferromagnetic (AFM) state at about 10 K. A 'screened' plasma edge at about 4000 cm −1 is revealed by optical measurement, which suggests that the material has a low carrier density. With decreasing temperature, the 'screened' plasma edge shows a blue shift, possibly due to a decrease of the effective mass of carriers. Notably, an anomalous temperature dependent midinfrared absorption feature is observed in the vicinity of the 'screened' plasma edge. In addition, it can be connected to the inflection point in the real part of the dielectric function 1 (ω), the frequency of which exactly tracks the temperature dependent 'screened' plasma frequency. This phenomena can be explained by the appearance of a coupled electron-plasmon 'plasmaron' feature.

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Section: Resultsmentioning

confidence: 71%

Revealing ‘plasmaron’ feature in DySb by optical spectroscopy study

Ban¹,

Wu²,

Xu³

et al. 2019

J. Phys.: Condens. Matter

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“…By incorporating the Heisenberg interactions, the Kondo-lattice model we study readily captures the effect of geometrical frustration. In addition, instead of treating the Kondo screening and magnetic order in terms of the longitudinal and transverse components of the Kondo-exchange interactions 33,34,36 , we will treat both effects in terms of interactions that are spin-rotationally invariant; this will turn out to be important in mapping out the global phase diagram. We use the spinon representation for S i , i.e., by…”

Section: Model and Methodsmentioning

confidence: 99%

Global phase diagram of a spin–orbit-coupled Kondo lattice model on the honeycomb lattice*

Li¹,

Yu²,

Si³

2019

Chinese Phys. B

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Motivated by the growing interest in the novel quantum phases in materials with strong electron correlations and spin-orbit coupling, we study the interplay between the spin-orbit coupling, Kondo interaction, and magnetic frustration of a Kondo lattice model on a two-dimensional honeycomb lattice. We calculate the renormalized electronic structure and correlation functions at the saddle point based on a fermionic representation of the spin operators. We find a global phase diagram of the model at half-filling, which contains a variety of phases due to the competing interactions. In addition to a Kondo insulator, there is a topological insulator with valence bond solid correlations in the spin sector, and two antiferromagnetic phases. Due to a competition between the spin-orbit coupling and Kondo interaction, the direction of the magnetic moments in the antiferromagnetic phases can be either within or perpendicular to the lattice plane. The latter antiferromagnetic state is topologically nontrivial for moderate and strong spin-orbit couplings.arXiv:1812.07979v1 [cond-mat.str-el]

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“…This suggests that the paramagnetic phase at large value of V is different from the phase when E f is fay away from the symmetric point. The hybridization between conduction and localized orbitals is responsible for the creation of the Kondo singlet, and in the mean field level the hybridization parameters are introduced to qualify the formation of Kondo singlet 40,41 . In order to characterize the Kondo screening, a hybridization parameter V u is defined as:…”

Section: B Spin Correlations and Kondo Singletmentioning

confidence: 99%

Degenerate orbital effect in a three-orbital periodic Anderson model

Yang

Wang

et al. 2019

Phys. Rev. B

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The competition between the Ruderman-Kittel-Kasuya-Yosida effect and Kondo effect is a central subject of the periodic Anderson model. By using the density matrix embedding theory, we study a three-orbital periodic Anderson model, in which the effects of degenerate conduction orbitals, via the local magnetic moments, number of electrons, and spin-spin correlation functions, are investigated. From the phase diagram at half filling, we find there exist two different antiferromagnetic phases and one paramagnetic phase. To explore the difference between the two antiferromagnetic phases, the topology of the Fermi surface and the connection with the standard periodic Anderson model are considered. The spin-spin correlation functions yield insight into the competition between Ruderman-Kittel-Kasuya-Yosida interaction and Kondo interaction. We further find there exist "scaling transformations," and by applying them to the data with different hybridization strength, all the data collapses. Our calculations agree with previous studies on the standard periodic Anderson model.

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Intrinsic plasmarons in warm graphene

Cited by 4 publications

References 34 publications

Revealing ‘plasmaron’ feature in DySb by optical spectroscopy study

Revealing ‘plasmaron’ feature in DySb by optical spectroscopy study

Global phase diagram of a spin–orbit-coupled Kondo lattice model on the honeycomb lattice*

Degenerate orbital effect in a three-orbital periodic Anderson model

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