Electrical Control of Magnetic Phase Transition in a Type-I Multiferroic Double-Metal Trihalide Monolayer

Xu, Meiling; Huang, Chengxi; Li, Yinwei; Liu, Siyu; Zhong, Xin; Jena, Puru; Kan, Erjun; Wang, Yanchao

doi:10.1103/physrevlett.124.067602

Cited by 93 publications

(58 citation statements)

References 54 publications

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“…Structure predictions for NH 3 -He compounds were performed using a particle-swarm optimization algorithm implemented in CALYPSO code 47,48 . This method is unbiased, not using any known structural information, and has successfully been used to predict various systems under high pressure [49][50][51][52][53][54][55][56][57] . We performed structural searches on (NH 3 ) x He y (x, y = 1, 2, 3) at 0-300 GPa with maximum simulation cells up to four formula units.…”

Section: Methodsmentioning

confidence: 99%

Formation of ammonia–helium compounds at high pressure

et al. 2020

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Uranus and Neptune are generally assumed to have helium only in their gaseous atmospheres. Here, we report the possibility of helium being fixed in the upper mantles of these planets in the form of NH 3-He compounds. Structure predictions reveal two energetically stable NH 3-He compounds with stoichiometries (NH 3) 2 He and NH 3 He at high pressures. At low temperatures, (NH 3) 2 He is ionic with NH 3 molecules partially dissociating into (NH 2) − and (NH 4) + ions. Simulations show that (NH 3) 2 He transforms into intermediate phase at 100 GPa and 1000 K with H atoms slightly vibrate around N atoms, and then to a superionic phase at~2000 K with H and He exhibiting liquid behavior within the fixed N sublattice. Finally, (NH 3) 2 He becomes a fluid phase at temperatures of 3000 K. The stability of (NH 3) 2 He at high pressure and temperature could contribute to update models of the interiors of Uranus and Neptune.

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Section: Methodsmentioning

confidence: 99%

Formation of ammonia–helium compounds at high pressure

et al. 2020

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“…For example, considering the simple 2D triangular lattice as shown in Figure 6a, two stable states with opposite polarization can be generated only if the anion forms strong bonding with one of the three neighboring cations (D-type) or the other two neighboring cations (C-type). [66] Hence, the orbital orders and the electronic structures in the two stable states are no longer equivalent. Recently, Xu et al predicted two non-equivalent stable states in ReWCl 6 monolayer by the firstprinciples calculations.…”

Section: D Vdw Ferroelectricsmentioning

confidence: 99%

“…Recently, Xu et al predicted two non-equivalent stable states in ReWCl 6 monolayer by the firstprinciples calculations. [66] As shown in Figure 6b, in one stable state, each Re atom forms a bond with one of its three neighboring W atoms, forming a dimer structure. Further, in the other stable state, each Re atom forms bonds with the other two neighboring W atoms, forming a chain structure.…”

Section: D Vdw Ferroelectricsmentioning

confidence: 99%

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Review on Recent Developments in 2D Ferroelectrics: Theories and Applications

2021

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Although only a few 2D materials have been predicted to possess ferroelectricity, 2D ferroelectrics are expected to play a dominant role in the upcoming nano era as important functional materials. The ferroelectric properties of 2D ferroelectrics are significantly different than those of traditional bulk ferroelectrics owing to their intrinsic size and surface effects. To date, 2D ferroelectrics have been reported to exhibit diverse properties ranging from bulk photovoltaic and piezoelectric/pyroelectric effects to the spontaneous valley and spin polarization. These properties are either dependent on ferroelectric polarization or coupled with it for easy electric control, thus making 2D ferroelectrics applicable to multifunctional nanodevices. At present, cumulative efforts are being made to explore 2D ferroelectrics in theories, experiments, and applications. Herein, such theories and methods are briefly introduced. Subsequently, intrinsic and extrinsic origins of 2D ferroelectricity are separately summarized. In addition, invented or laboratory-validated 2D ferroelectric-based applications are listed. Finally, the existing challenges and prospects of 2D ferroelectrics are discussed.

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“…The 2DMs have demonstrated real and potential optical, electrical, mechanical, thermoelectrical, catalytic, energy conversion and storage, spintronic, photonics, etc. applications [3][4][5][6][7][8][9]. 2DMs-based devices exhibit outstanding characteristics with appropriate optical gain, controllable spectrum sensitivity, large photoresponse bandwidth, and acceptable conversion efficiency [10].…”

Section: Introductionmentioning

confidence: 99%