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Rich many-body phase diagram of electrons and holes in doped monolayer transition metal dichalcogenides

Journal Contribution - e-publication

We use a variational technique to study the many-body phase diagram of electrons and holes in n-doped and p-doped monolayer transition metal dichalcogenides (TMDs). We find a total of four different phases. (i) A fully spin polarized and valley polarized ferromagnetic state. (ii) A state with no global spin polarization but with spin polarization in each valley separately, i.e., spin-valley locking. (iii) A state with spin polarization in one of the valleys and little to no spin polarization in the other valley. (iv) A paramagnetic state with no valley polarization. These phases are separated by first-order phase transitions and are determined by the particle density and the dielectric constant of the substrate. We find that in the presence of a perpendicular magnetic field the four different phases persist. In the case of n-doped MoS2, a fifth phase, which is completely valley polarized but not spin polarized, appears for magnetic fields larger than 7 T and for magnetic fields larger than 23 T completely replaces the second phase.
Journal: Physical review B
ISSN: 2469-9969
Volume: 98
Publication year:2018
Keywords:A1 Journal article
BOF-keylabel:yes
BOF-publication weight:2
CSS-citation score:1
Authors from:Higher Education
Accessibility:Open