<i>Colloquium</i>: Emergent properties in plane view: Strong correlations at oxide interfaces

Chakhalian, Jak; Freeland, J. W.; Millis, Andrew J.; Panagopoulos, C.; Rondinelli, James M.

doi:10.1103/revmodphys.86.1189

Cited by 253 publications

(250 citation statements)

References 235 publications

(315 reference statements)

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“…For example, electrostatic tuning of a high-mobility electron liquid in graphene allows one to select the regime of carrier density when the flow of electrons becomes viscous, whereas electric conductance can exceed the limits of ballistic transport 39 . 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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Section: Nature Materials Doi: 101038/nmat5017mentioning

confidence: 99%

Towards properties on demand in quantum materials

2017

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“…Toward this goal, ultra-thin heterostructures composed of two or more structurally, chemically, and electronically dissimilar constituent oxides have been developed into a powerful approach over the past decade. [1][2][3][4][5][6] The main notion here is that at the interface where the dissimilarities meet, the frustration caused by mismatches between arrangement of atoms, charges, orbitals, or spins can trigger the emergence of phenomena with electronic and magnetic structures markedly different from the corresponding bulk compositions. [1] As a result, the interface engineering (IE) has opened a route to novel material behaviors by means of those mismatches as the control parameters.…”

Section: Introductionmentioning

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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“…[1][2][3][4][5][6][7] Due to recent advances in atomic level synthesis technique, interface engineering [8][9][10][11][12][13] of oxides has emerged as a useful approach to explore and fine tune their functional properties. Because manipulating the interface is often associated with the added structural distortions, it is crucial to understand how the interfacial modification affects not only the structural but also the physical properties of entire constituent oxide layers.…”

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confidence: 99%

Research Update: Interface-engineered oxygen octahedral tilts in perovskite oxide heterostructures

et al. 2015

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Interface engineering of structural distortions is a key for exploring the functional properties of oxide heterostructures and superlattices. In this paper, we report on our comprehensive investigations of oxygen octahedral distortions at the heterointerface between perovskite oxides SrRuO3 and BaTiO3 on GdScO3 substrates and of the influences of the interfacially engineered distortions on the magneto-transport properties of the SrRuO3 layer. Our state-of-the-art annular bright-field imaging in aberration-corrected scanning transmission electron microscopy revealed that the RuO6 octahedral distortions in the SrRuO3 layer have strong dependence on the stacking order of the SrRuO3 and BaTiO3 layers on the substrate. This can be attributed to the difference in the interfacial octahedral connections. We also found that the stacking order of the oxide layers has a strong impact on the magneto-transport properties, allowing for control of the magnetic anisotropy of the SrRuO3 layer through interface engineering. Our results demonstrate the significance of the interface engineering of the octahedral distortions on the structural and physical properties of perovskite oxides.

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Colloquium: Emergent properties in plane view: Strong correlations at oxide interfaces

Cited by 253 publications

References 235 publications

Towards properties on demand in quantum materials

Towards properties on demand in quantum materials

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

Research Update: Interface-engineered oxygen octahedral tilts in perovskite oxide heterostructures

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