All-in-all-out magnetic domain wall conduction in a pyrochlore iridate heterointerface

Fujita, Takahiro; Uchida, Masaki; Kozuka, Y.; Sano, Wataru; Tsukazaki, Atsushi; Arima, T.; Kawasaki, Masashi

doi:10.1103/physrevb.93.064419

Cited by 29 publications

(29 citation statements)

References 41 publications

(61 reference statements)

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“…Alternatively, one can view our work as a study of spin (local moment) models with SOC on decorated kagome lattices, possibly artificially created in an optical lattice using artificial gauge fields to realize the SOC and spin interaction terms [58][59][60][61]. While experiments on Eu 2 Ir 2 O 7 provide evidence for an AIAO order in thicker thin films [62][63][64], theoretical studies on atomically thin bilayers and trilayers are less conclusive [41,52,53]. We find that, in the strong coupling limit and on the mean field level, the magnetic ground state is AIAO in the trilayer system, and closely related to it in the bilayer.…”

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confidence: 99%

Topological Magnon Bands and Unconventional Superconductivity in Pyrochlore Iridate Thin Films

Laurell

Fiete

2017

Phys. Rev. Lett.

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We theoretically study the magnetic properties of pyrochlore iridate bilayer and trilayer thin films grown along the [111] direction using a strong coupling approach. We find the ground state magnetic configurations on a mean field level and carry out a spin-wave analysis about them. In the trilayer case the ground state is found to be the all-in/all-out (AIAO) state, whereas the bilayer has a deformed AIAO state. For all parameters of the spin-orbit coupled Hamiltonian we study, the lowest magnon band in the trilayer case has a non-zero Chern number. In the bilayer case we also find a parameter range with non-zero Chern numbers. We calculate the magnon Hall response for both geometries, finding a striking sign change as function of temperature. Using a slave-boson mean-field theory we study the doping of the trilayer system and discover an unconventional timereversal symmetry broken d +id superconducting state. Our study complements prior work in the weak coupling limit and suggests that the [111] grown thin film pyrochlore iridates are a promising candidate for topological properties and unconventional orders. 75.30.Ds,71.27.+a Introduction -One of the main focal points of quantum materials research is topological states of matter, where the essential physics is generally due to spin-orbit coupling (SOC) [1][2][3][4]. Another is correlated electron systems, in which electron-electron interactions dominate, leading to interaction-driven insulators, magnetism, and unconventional superconductivity [5]. Even more possibilities open up when both SOC and electron-electron interactions are present, such as fractionalized topological insulators (TI) [6][7][8][9][10][11][12][13][14][15][16][17], interaction-induced TI [18][19][20][21][22][23][24], and unconventional magnetic states [25][26][27]. A promising place to look for both types of physics is in 5d transition-metal oxides, which tend to have comparable electron-electron interaction and SOC strengths [28][29][30].

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confidence: 99%

Topological Magnon Bands and Unconventional Superconductivity in Pyrochlore Iridate Thin Films

Laurell

Fiete

2017

Phys. Rev. Lett.

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“…The domain walls are therefore expected to be conducting -and it was argued in Yamaji and Imada, 2014 that the metallic character of domain walls may survive even when the Weyl nodes have annihilated to form a bulk insulator. Indeed such metallic domain wall conduction was reported in A=Nd pyrochlore iridates (Fujita et al, 2016;Ueda et al, 2014) indicating proximity to a Weyl semimetal.…”

Section: Magnetic Weyl Semimetalsmentioning

confidence: 99%

Weyl and Dirac semimetals in three-dimensional solids

2018

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Weyl and Dirac semimetals are three dimensional phases of matter with gapless electronic excitations that are protected by topology and symmetry. As three dimensional analogs of graphene, they have generated much recent interest. Deep connections exist with particle physics models of relativistic chiral fermions, and -despite their gaplessness -to solid-state topological and Chern insulators. Their characteristic electronic properties lead to protected surface states and novel responses to applied electric and magnetic fields. The theoretical foundations of these phases, their proposed realizations in solid state systems, recent experiments on candidate materials, as well as their relation to other states of matter are reviewed.

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“…This can be easily understood since the B sublattice in the pyrochlore structure is identical to that of spinel. Several theoretical works [12,17,18,89] have predicted the emergence of topological states with different B cations, while the experimental work on fabricating (111) pyrochlore films have been recently initiated [90][91][92][93] . Additionally, it was theoretically proposed that a monolayer of corundum-type (chemical formula: M 2 O 3 ) structure grown along the (0001) direction could also form the graphene-like honeycomb lattice geometry [94] analogous to the perovskite (111) bilayers (Fig.…”

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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All-in-all-out magnetic domain wall conduction in a pyrochlore iridate heterointerface

Cited by 29 publications

References 41 publications

Topological Magnon Bands and Unconventional Superconductivity in Pyrochlore Iridate Thin Films

Topological Magnon Bands and Unconventional Superconductivity in Pyrochlore Iridate Thin Films

Weyl and Dirac semimetals in three-dimensional solids

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

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