Exchange Intervalley Scattering And Magnetic Phase Diagram Of Transition Metal Dichalcogenide Monolayers

Abstract

We analyze magnetic phases of monolayers of transition metal dichalcogenides that are two-valley materials with electron-electron interactions. The exchange inter-valley scattering makes two-valley systems less stable to the spin fluctuations but more stable to the valley fluctuations. We predict a first order ferromagnetic phase transition governed by the non-analytic and negative cubic term in the free energy that results in a large spontaneous spin magnetization. Finite spin-orbit interaction leads to the out-of-plane Ising order of the ferromagnetic phase. Our theoretical prediction is consistent with the recent experiment on electron-doped monolayers of MoS${}_2$ reported by Roch $\text{et al.}$ [1]. The proposed first order phase transition can also be tested by measuring the linear magnetic field dependence of the spin susceptibility in the paramagnetic phase which is a direct consequence of the non-analyticity of the free energy.

arXiv comment9 pages, 6 figures

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Cited by in corpus (12)

• First-order magnetic phase-transition of mobile electrons in monolayer MoS${}_2$
• Spontaneous valley polarization of interacting carriers in a monolayer semiconductor
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ monolayers
• Valley two-qubit system in a MoS${}_2$-monolayer gated double quantum dot
• Superconducting contacts to a monolayer semiconductor
• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Electronic properties and polaronic dynamics of semi-Dirac system within ladder approximation
• Topological Interlayer Superconductivity in a van der Waals Heterostructure
• Attractive polaron formed in doped nonchiral/chiral parabolic system within ladder approximation
• Magnetic phase transitions in two-dimensional two-valley semiconductors with in-plane magnetic field
• Spin susceptibility in interacting two-dimensional semiconductors and bilayer systems at first order: Kohn anomalies and spin density wave ordering
• Strong intervalley correlation induced a magnetic order transition in monolayer ${\text{MoS}}_2$