Quantum electron liquid and its possible phase transition

Kim, Sunghun; Bang, Joonho; Lim, Chan-young; Lee, Seung Yong; Hyun, Jounghoon; Lee, Gyubin; Lee, Yeonghoon; Denlinger, Jonathan D.; Huh, Soonsang; Kim, Changyoung; Song, Sang Yong; Seo, Jungpil; Thapa, Dinesh; Kim, Seong‐Gon; Lee, Young Hee; Kim, Yeongkwan; Kim, Sung Wng

doi:10.1038/s41563-022-01353-8

Cited by 12 publications

(8 citation statements)

References 47 publications

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“…These IQEs, which can have interactions with each other or surrounding cations, can thus trigger antiferromagnet, ferromagnet, or permanent magnet, all the magnetism. Finally, the reversible substitution and conservation between magnetic IQEs and hydrogen anions can provide a possible platform to study the exotic magnetic state of quantum electron phases such as Wigner crystal on the electrides 22,45 .…”

Section: Discussionmentioning

confidence: 99%

Magnetic quasi-atomic electrons driven reversible structural and magnetic transitions between electride and its hydrides

Kim

Lee

Lim

et al. 2023

Preprint

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In electrides, interstitial anionic electrons (IAEs) in the quantized energy levels at cavities of positively charged lattice framework possess their own magnetic moment and interact with each or surrounding cations, behaving as quasi-atoms and inducing diverse magnetism. Here, we report the reversible structural and magnetic transitions by the substitution of the quasi-atomic IAEs in the ferromagnetic two-dimensional [Gd2C]2+×2e- electride with hydrogens and subsequent dehydrogenation of the canted antiferromagnetic Gd2CHy (y>2.0). It is demonstrated that structural and magnetic transitions are strongly coupled by the presence or absence of the magnetic quasi-atomic IAEs and non-magnetic hydrogen anions in the interlayer space, which dominate exchange interactions between out-of-plane Gd-Gd atoms. Furthermore, the magnetic quasi-atomic IAEs are inherently conserved by the hydrogen desorption from the P3̅1m structured Gd2CHy, restoring the original ferromagnetic state of the R3̅m structured [Gd2C]2+×2e- electride. This variable density of magnetic quasi-atomic IAEs enables the quantum manipulation of floating electron phases on the electride surface.

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Section: Discussionmentioning

confidence: 99%

Magnetic quasi-atomic electrons driven reversible structural and magnetic transitions between electride and its hydrides

Kim

Lee

Lim

et al. 2023

Preprint

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“…Solid state systems hosting Wigner crystals usually contain some form of quenched disorder, and a variety of studies have revealed nonlinear transport and possible depinning thresholds [44-46, 48, 54] associated with enhanced noise [51]. Wigner crystals can also undergo melting transitions as a function of increasing temperature [55][56][57][58][59]. There is a growing number of solid state systems in which Wigner crystals could be realized, including dichalcogenide monolayers [60], moiré heterostructures [61,62], bilayer systems [63], and Wigner crystals at zero field [64], while new advances in materials preparation point to a variety of future experiments that could be done in which the competition between quenched disorder and thermal effects could be studied [11].…”

Section: Introductionmentioning

confidence: 99%

Melting, reentrant ordering and peak effect for Wigner crystals with quenched and thermal disorder

Reichhardt

Reichhardt²

2023

New J. Phys.

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We consider simulations of Wigner crystals in solid state systems interacting with random quenched disorder in the presence of thermal fluctuations. When quenched disorder is absent, there is a well defined melting temperature determined by the proliferation of topological defects, while for zero temperature, there is a critical quenched disorder strength above which topological defects proliferate. When both thermal and quenched disorder are present, these effects compete, and the thermal fluctuations can reduce the effectiveness of the quenched disorder, leading to a reentrant ordered phase in agreement with the predictions of Nelson [Phys. Rev. B 27, 2902 (1983)]. There are two competing theories for the low temperature behavior, and our simulations show that both capture aspects of the actual response. The critical disorder strength separating ordered from disordered states remains finite as the temperature goes to zero, as predicted by Cha and Fertig [Phys. Rev. Lett. 74, 4867 (1995)], instead of dropping to zero as predicted by Nelson. At the same time, the critical disorder strength decreases with decreasing temperature, as predicted by Nelson, instead of remaining constant, as predicted by Cha and Fertig. The onset of the reentrant phase can be deduced based on changes in the transport response, where the reentrant ordering appears as an increase in the mobility or the occurrence of a depinning transition. We also find that when the system is in the ordered state and thermally melts, there is an increase in the effective damping or pinning. This produces a drop in the electron mobility that is similar to the peak effect phenomenon found in superconducting vortices, where thermal effects soften the lattice or break down its elasticity, allowing the particles to better adjust their positions to take full advantage of the quenched disorder.

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“…Furthermore, the mixed-cation [YGdC] 2+ ·2e − electride exhibited the ferrimagnetic state, which was attributed to the direct exchange interactions between magnetic IQEs at different crystallographic positions 21 . In addition to the magnetic ordering of IAEs in the electrides, the IAEs on the cleaved surface of 2D [Gd 2 C] 2+ ·2e − electride are found to be spin-polarized Fermi liquid and crystallized into the hexatic phase by decreasing their density on the surface 22 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic quasi-atomic electrons driven reversible structural and magnetic transitions between electride and its hydrides

Lee,

Lim,

Khan

et al. 2023

Nat Commun

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In electrides, interstitial anionic electrons (IAEs) in the quantized energy levels at cavities of positively charged lattice framework possess their own magnetic moment and interact with each or surrounding cations, behaving as quasi-atoms and inducing diverse magnetism. Here, we report the reversible structural and magnetic transitions by the substitution of the quasi-atomic IAEs in the ferromagnetic two-dimensional [Gd2C]2+·2e− electride with hydrogens and subsequent dehydrogenation of the canted antiferromagnetic Gd2CHy (y > 2.0). It is demonstrated that structural and magnetic transitions are strongly coupled by the presence or absence of the magnetic quasi-atomic IAEs and non-magnetic hydrogen anions in the interlayer space, which dominate exchange interactions between out-of-plane Gd−Gd atoms. Furthermore, the magnetic quasi-atomic IAEs are inherently conserved by the hydrogen desorption from the P$$\bar{3}$$ 3 ¯ 1m structured Gd2CHy, restoring the original ferromagnetic state of the R$$\bar{3}$$ 3 ¯ m structured [Gd2C]2+·2e− electride. This variable density of magnetic quasi-atomic IAEs enables the quantum manipulation of floating electron phases on the electride surface.

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Quantum electron liquid and its possible phase transition

Cited by 12 publications

References 47 publications

Magnetic quasi-atomic electrons driven reversible structural and magnetic transitions between electride and its hydrides

Magnetic quasi-atomic electrons driven reversible structural and magnetic transitions between electride and its hydrides

Melting, reentrant ordering and peak effect for Wigner crystals with quenched and thermal disorder

Magnetic quasi-atomic electrons driven reversible structural and magnetic transitions between electride and its hydrides

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