Polar metals by geometric design

Kim, T. H.; Puggioni, Danilo; Yuan, Yakun; Xie, Lin; Zhou, Hua; Campbell, Neil; Ryan, Philip; Choi, Y.; Kim, J. W.; Patzner, Jacob J.; Ryu, Sangwoo; Podkaminer, Jacob; Irwin, Julian; Ma, Yandong; Fennie, Craig J.; Rzchowski, M. S.; Pan, Xiaoqing; Gopalan, Venkatraman; Rondinelli, James M.; Eom, Chang‐Beom

doi:10.1038/nature17628

Cited by 299 publications

(264 citation statements)

References 41 publications

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“…Furthermore, the combination of GLE and SE may open another interesting dimension for controlled modifications of the bond-length and bond-angle in structural units by epitaxial strain along the unconventional crystallographic axes. [100][101][102] To summarize, with the modern state-of-the-art thin-film fabrication methods, the notion of GLE can be experimentally realized and used as another control knob. Despite the challenges of layering with atomic precision along unconventional crystallographic directions, GLE has excellent potential for the discovery of novel electronic, magnetic, and topological phases with complex oxides.…”

Section: Discussionmentioning

confidence: 99%

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

et al. 2016

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Epitaxial heterostructures composed of complex oxides have fascinated researchers for over a decade as they offer multiple degrees of freedom to unveil emergent many-body phenomena often unattainable in bulk. Recently, apart from stabilizing such artificial structures along the conventional [001]-direction, tuning the growth direction along unconventional crystallographic axes has been highlighted as a promising route to realize novel quantum many-body phases. Here we illustrate this rapidly developing field of geometrical lattice engineering with the emphasis on a few prototypical examples of the recent experimental efforts to design complex oxide heterostructures along the (111) orientation for quantum phase discovery and potential applications.

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Section: Discussionmentioning

confidence: 99%

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

et al. 2016

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“…polar structure and metallicity, could broaden the new research area of electronic devices. In fact, the polar metals have been observed in LiOsO 3 [46,47] and thin-film RNiO 3 [48], and also predicted in ruthenate oxide [49]. In our previous studied (YFeO 3 ) 2 /(YTiO 3 ) 2 , the metallicity is not robust, or even artificial.…”

Section: + Superlatticementioning

confidence: 99%

(LaTiO3)n/(LaVO3)n as a model system for unconventional charge transfer and polar metallicity

et al. 2017

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At interfaces between oxide materials, lattice and electronic reconstructions always play important roles in exotic phenomena. In this study, the density functional theory and maximally localized Wannier functions are employed to investigate the (LaTiO3)n/(LaVO3)n magnetic superlattices. The electron transfer from Ti 3+ to V 3+ is predicted, which violates the intuitive band alignment based on the electronic structures of LaTiO3 and LaVO3. Such unconventional charge transfer quenches the magnetism of LaTiO3 layer mostly and leads to metal-insulator transition in the n = 1 superlattice when the stacking orientation is altered. In addition, the compatibility among the polar structure, ferrimagnetism, and metallicity is predicted in the n = 2 superlattice.

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“…Oxide heterostructures have also enabled the stabilization of interesting electronic phases at the interfaces of dissimilar oxides 40 or via interactions with the substrate. A recent example of the former is the implementation of a polar metal: a novel form of a conducting material with a static microscopic polarization at equilibrium 41 .…”

Section: Nature Materials Doi: 101038/nmat5017mentioning

confidence: 99%

Towards properties on demand in quantum materials

2017

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Q uantum materials are on the ascent. This term embodies a vast portfolio of compounds and phenomena where ramifications of quantum mechanics are demonstrably real. Quantum materials are in the vanguard of contemporary physics in part because these systems afford an exceptional venue to uncover the many roles of symmetry, topology, dimensionality and strong correlations in macroscopic observables. Here we set out to explore the ways and means of creating new states of matter in quantum materials and manipulating their phases via external stimuli. Practical control of these properties is a precondition for exploiting quantum advantages in new photonic, electronic and energy technologies, a task of significant societal impact 1 . We will primarily focus on the following classes of quantum materials: transition metal oxides, Fe-and Cu-based high-T c superconductors, van der Waals semiconductors, topological insulators and Weyl semimetals, and, finally, graphene.The properties of quantum materials are anomalously sensitive to external stimuli. In these systems, interactions associated with spin, charge, lattice and orbital degrees of freedom are commonly on par with the electronic kinetic energy. A rather fragile balance between coexisting and competing ground states can be readily shifted via external stimuli, leading to a raft of quantum phases and transitions between them 2,3 . Furthermore, certain classes of driven quantum states (Fig. 1a and Box 1) are explicit products of coherent interaction between light and matter 4-6 . Alternatively, the properties of quantum materials can be pre-programmed by directly manipulating the electronic wavefunction and the attendant Berry phase that give rise to the anomalous velocity of electrons in a solid [7][8][9] . These complementary avenues of controls mean that investigations no longer need to be reduced to merely observing (in contrast, for example, to astrophysics). Instead, it is now feasible to attain, in a predictable fashion, 'properties on demand' by steering a quantum material towards a desirable ground, metastable or transient state. The past decade has witnessed an explosion in the field of quantum materials, headlined by the predictions and discoveries of novel Landau-symmetry-broken phases in correlated electron systems, topological phases in systems with strong spin-orbit coupling, and ultra-manipulable materials platforms based on two-dimensional van der Waals crystals. Discovering pathways to experimentally realize quantum phases of matter and exert control over their properties is a central goal of modern condensed-matter physics, which holds promise for a new generation of electronic/photonic devices with currently inaccessible and likely unimaginable functionalities. In this Review, we describe emerging strategies for selectively perturbing microscopic interaction parameters, which can be used to transform materials into a desired quantum state. Particular emphasis will be placed on recent successes to tailor electronic interaction parameters through th...

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Polar metals by geometric design

Cited by 299 publications

References 41 publications

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

(LaTiO3)n/(LaVO3)n as a model system for unconventional charge transfer and polar metallicity

Towards properties on demand in quantum materials

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