Cascade of Magnetic-Field-Induced Lifshitz Transitions in the Ferromagnetic Kondo Lattice Material 
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Pfau, Heike; Daou, Ramzy; Friedemann, Sven; Karbassi, Sara; Ghannadzadeh, Saman; Küchler, R.; Hamann, Sandra; Steppke, Alexander; Sun, Dan; König, Markus; Mackenzie, A. P.; Kliemt, Kristin; Krellner, C.; Brando, M.

doi:10.1103/physrevlett.119.126402

Cited by 27 publications

(28 citation statements)

References 48 publications

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“…By applying a gate voltage or hole doping, γ‐GeSe will undergo a Lifshitz transition as shown in Figure 2d. Since the Lifshitz transition leads to a variation of the topology of the Fermi surface, lots of efforts have been made to investigate the related transport, [ 14 ] topological, [ 15 ] and magnetic [ 16 ] properties. Similar band structures are found for monolayer γ‐SnS and γ‐SnSe.…”

Section: Resultsmentioning

confidence: 99%

Excitons and Electron–Hole Liquid State in 2D γ‐Phase Group‐IV Monochalcogenides

Luo

Duan

Yakobson

et al. 2020

Adv Funct Materials

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Different dispersion near the electronic band edge of a semiconductor can have great influence on its transport, thermoelectric, and optical properties. Using first-principles calculations, it is demonstrated that a new phase of group-IV monochalcogenides (γ-MX, M = Ge, Sn; X = S, Se, or Te) can be stabilized in monolayer limit. γ-MXs are shown to possess a unique band dispersion-that is, camel's back like structure-in the top valence band. The band nesting effect near the camel's back region induces a large excitonic absorbance and significantly different exciton behaviors from other 2D materials. Importantly, the small effective mass and the indirect characteristics of lowest-energy exciton render it advantageous for the generation of electron-hole liquid state. After careful evaluation of the electron-hole dissociation temperature and the Mott critical density, it is predicted that a high-temperature exciton gas to electron-hole liquid phase transition can be achieved in these materials with a low excitation power density. The findings open up new opportunities for both the fundamental research on exciton physics and design of excitonic devices based on 2D materials with distinct band dispersion.

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Section: Resultsmentioning

confidence: 99%

Excitons and Electron–Hole Liquid State in 2D γ‐Phase Group‐IV Monochalcogenides

Luo

Duan

Yakobson

et al. 2020

Adv Funct Materials

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“…Contrary to thermodynamic measurements, anomalies in MR are comparatively magnified through the large factor of ( ω c τ ) 2 , where ω c and τ denote the cyclotron frequency and the relaxation time 38 . In recent experiments of heavy fermion systems, similar kinds of changes in topology of the FSs manifest as distinct anomalies in the transport properties, whereas there are no distinct anomalies in the thermodynamic quantities 39–42 . In addition, it is also not clear why we do not observe similar anomaly for B || bisectrix.…”

Section: Discussionmentioning

confidence: 99%

Thermodynamic evidence of magnetic-field-induced complete valley polarization in bismuth

Iwasa

Kondo

Kawachi

et al. 2019

Sci Rep

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We investigated the fundamental physical properties in the ultra-quantum limit state of bismuth through measurements of magnetoresistance, magnetization, magnetostriction, and ultrasound attenuation in magnetic fields up to 60T. For magnetic fields applied along the bisectrix direction of a single crystal, a drastic sign reversal in magnetostriction was observed at approximately 39T, which could be ascribed to the complete valley polarization in the electron Fermi pockets. The application of magnetic fields along the binary direction presented an anomalous feature at approximately 50T only in the magnetoresistance. The emergence of a field-induced splitting of a valley was proposed as a possible origin of this anomaly.

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“…( 35) contains only the even degree of ω it is easy to understand that the integrand in Eq. (11) in the main paper is the odd function of ω and, hence, the integral is equal to zero.…”

Section: Gapless Statementioning

confidence: 97%

“…The ideas proposed 60 years ago remain still requested in modern studies on the stability of current-biased superconducting wires (see [10] and references therein), transformations of the complex heavy fermion Fermi surfaces due to magnetic field effects [11,12], etc. Moreover, the concept of a connection between the topological properties of the different materials exhibiting gapless states and the occurrence of the exotic Lifshitz transitions was recently discussed in literature based on very general topological arguments.…”

Section: Introductionmentioning

confidence: 99%

Topological phase transition between the gap and the gapless superconductors

2022

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It is demonstrated that the known for a long time transition between the gap and the gapless states in the Abrikosov-Gor’kov theory of a superconductor with paramagnetic impurities is of the Lifshitz type, i.e. of the 2\frac12212 order phase transition. We reveal the emergence of a cuspidal edge at the density of states surface N(\omega,\Delta_0)N(ω,Δ0) (\Delta_0Δ0 is the value of the superconducting order parameter in the absence of magnetic impurities) and the occurrence of the catastrophe phenomenon at the transition point. We study the stability of such a transition with respect to the spatial fluctuations of the magnetic impurities critical concentration n_sns and show that the requirement for validity of its mean field description is unobtrusive: \nabla \left( {\ln{n_s}} \right) \ll \xi^{-1}∇(lnns)≪ξ−1 (here \xiξ is the superconducting coherence length). Finally, we show that, similarly to the Lifshitz transition, the transition between gap and gapless states should be accompanied by the corresponding singularities. For instance, the superconducting thermoelectric effect has a giant peak exceeding the normal value of the Seebeck coefficient by the ratio of the Fermi energy and the superconducting gap. The concept of the experiment for the confirmation of 2\frac12212 order transition nature is proposed. The obtained theoretical results can be applied for the explanation of recent experiments with lightwave-driven gapless superconductivity, for the new interpretation of the disorder induced transition s_{\pm}s±-s_{++}s++ states via gapless state in multi-band superconductors, for better understanding of the gapless color superconductivity in quantum chromodynamics, the string theory.

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Cascade of Magnetic-Field-Induced Lifshitz Transitions in the Ferromagnetic Kondo Lattice Material YbNi4P2

Abstract: General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available:

Cited by 27 publications

References 48 publications

Excitons and Electron–Hole Liquid State in 2D γ‐Phase Group‐IV Monochalcogenides

Excitons and Electron–Hole Liquid State in 2D γ‐Phase Group‐IV Monochalcogenides

Thermodynamic evidence of magnetic-field-induced complete valley polarization in bismuth

Topological phase transition between the gap and the gapless superconductors

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