Linear Magnetoelectric Phase in Ultrathin MnPS3 Probed by Optical Second Harmonic Generation
Physical Review Letters
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The transition metal thiophosphates MPS₃ (M=Mn, Fe, Ni) are a class of van der Waals stacked insulating antiferromagnets that can be exfoliated down to the ultrathin limit. MnPS₃ is particularly interesting because its Neel ordered state breaks both spatial-inversion and time-reversal symmetries, allowing for a linear magnetoelectric phase that is rare among van der Waals materials. However, it is unknown whether this unique magnetic structure of bulk MnPS₃ remains stable in the ultrathin limit. Using optical second harmonic generation rotational anisotropy, we show that long-range linear magnetoelectric type Neel order in MnPS₃ persists down to at least 5.3 nm thickness. However an unusual mirror symmetry breaking develops in ultrathin samples on SiO₂ substrates that is absent in bulk materials, which is likely related to substrate induced strain.
Linear magnetoelectric phase; Metal thiophosphates; Antiferromagnets; Ultrathin limit; Optical second harmonic generation rotational anisotropy
Physical Sciences and Mathematics | Physics
Jae Roh, C.,
Island, J. O.,
Young, A. F.,
Seok Lee, J.,
Linear Magnetoelectric Phase in Ultrathin MnPS3 Probed by Optical Second Harmonic Generation.
Physical Review Letters, 124(2),