Experimental Evidence of 
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 Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization

Omar, Ganesh Ji; Kong, Weilong; Jani, Hariom; Li, Mingfen; Zhou, Jun; Lim, Zhi Shiuh; Prakash, Saurav; Zeng, Shuming; Hooda, Sonu; Venkatesan, T.; Feng, Yong; Pennycook, S. J.; Shen, Lei; Ariando, Ariando

doi:10.1103/physrevlett.129.187203

Cited by 11 publications

(3 citation statements)

References 53 publications

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“…The values of the SOC parameters is comparable with those of Bi 2 WO 6 , BiAlO 3 , GeTe or BiTeI (Ref. [27]), and it is one order of magnitude larger than the values reported in a recent work on LaAlO 3 /LaFeO 3 /SrTiO 3 [37]. Furthermore, exploiting the SOC in this material can be achieved without the need to engineer the unit cell, as it may occur with certain tungsten oxide compounds such as WO 3 , which requires confinement in the direction perpendicular to the polarization [27].…”

supporting

confidence: 63%

Large and tunable spin-orbit effect of 6p orbitals through structural cavities in crystals

Fava,

Lafargue-Dit-Hauret,

Romero

et al. 2023

Phys. Rev. B

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We explore from first-principles calculations the ferroelectric material Pb 5 Ge 3 O 11 as a model for controlling the spin-orbit interaction (SOC) in crystalline solids. The SOC has a surprisingly strong effect on the structural energy landscape by deepening the ferroelectric double well. We observe that this effect comes from a specific Pb Wyckoff site that lies on the verge of a natural cavity channel of the crystal. We also find that a unique cavity state is formed by the empty 6p states of another Pb site at the edge of the cavity channel. This cavity state exhibits a sizeable spin splitting with a mixed Rashba-Weyl character and a topologically protected crossing of the related bands. We also show that the ferroelectric properties and the significant SOC effects are exceptionally robust against n-doping up to several electrons per unit cell. We trace the provenance of these original effects to the unique combination of the structural cavity channel and the chemistry of the Pb atoms with 6p orbitals localizing inside the channel.Relativistic atomic spin-orbit coupling (ASOC) was first introduced in the early 1930s during the development of quantum mechanics. It refers to the interaction between the electronic spin (S) and its angular momentum (L). Even though ASOC is weak compared with Coulomb or kinetic interactions (one to two orders of magnitude) and even weaker in molecules or crystals owing to the quenching of L with chemical bonding, it appears to be the fundamental interaction to describe, for example, the atomic magnetic moment direc-

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supporting

confidence: 63%

Large and tunable spin-orbit effect of 6p orbitals through structural cavities in crystals

Fava,

Lafargue-Dit-Hauret,

Romero

et al. 2023

Phys. Rev. B

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“…We found Δ so decreasing to about 31 meV when the LAO thickness increases to 50 nm. Notably, the maximal Rashba splitting energy Δ so ≈ 48 meV of LAO/KTO (111) heterointerface in this work is almost one order of magnitude larger than that of the LAO/STO systems (3–7 meV) [ 10,29,40,41 ] and also significantly surpass that of LAO/KTO (001) (≈30 meV) [ 20 ] and EuO/KTO(110) heterointerfaces(≈20 meV). [ 25 ]…”

Section: Resultsmentioning

confidence: 87%

Confinement‐Enhanced Rashba Spin–Orbit Coupling at the LaAlO₃/KTaO₃ Interface via LaAlO₃ Thickness Control

Liu

Bao

et al. 2023

Physica Rapid Research Ltrs

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Superconductors with strong spin–orbit coupling (SOC) have attracted tremendous attention due to the great potential for realizing topological superconductivity and searching Majorana fermions. Recently, two‐dimensional (2D) superconductivity with a relatively high T c ≈ 2 K is observed in LaAlO3/KTaO3 (111) and EuO/KTaO3 (111) heterointerfaces. However, the experimental investigations of the SOC in the KTaO3 (111)‐based heterointerfaces are still lacking. Herein, the Rashba SOC of LaAlO3/KTaO3 (111) interfaces with varied LaAlO3 thickness is studied. It is revealed that the spatial confinement of the 2D electron gas tuned by the LaAlO3 thickness prominently enhances the SOC. The maximal Rashba spin‐splitting energy Δso reaches ≈48 meV in this work, which is an extremely high value ever reported in oxide‐based conducting heterointerfaces.

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“…For the traditional crystalline 2DES on the SrTiO 3 substrate, previous studies have revealed that the interfacial lattice mismatch between the polar capping layer and SrTiO 3 substrate is strongly coupled to the low-temperature transport properties [12,54]. The lowtemperature µ H can be improved by thirty times when reducing the lattice mismatch from −3% to −1% [14], corresponding to the less strained heterointerfaces for the higher carrier mobilities [54,55]. This trend is also in line with the results from our crystalline bilayers.…”

Section: Resultsmentioning

confidence: 99%

Capping-layer-mediated lattice mismatch and redox reaction in SrTiO₃-based bilayers

Huang

Dai

et al. 2023

J. Phys.: Condens. Matter

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It is well known that the traditional two-dimensional electron system (2DES) hosted by the SrTiO3 substrate can exhibit diverse electronic states by modifying the capping layer in heterostructures. However, such capping layer engineering is less studied in the SrTiO3-layer-carried 2DES (or bilayer 2DES), which is different from the traditional one on transport properties but more applicable to the thin-film devices. Here, several SrTiO3 bilayers are fabricated by growing various crystalline and amorphous oxide capping layers on the epitaxial SrTiO3 layers. For the crystalline bilayer 2DES, the monotonical reduction on the interfacial conductance, as well as carrier mobility, is recorded on increasing the lattice mismatch between the capping layers and epitaxial SrTiO3 layer. The mobility edge raised by the interfacial disorders is highlighted in the crystalline bilayer 2DES. On the other hand, when increasing the concentration of Al with high oxygen affinity in the capping layer, the amorphous bilayer 2DES becomes more conductive accompanied by the enhanced carrier mobility but almost constant carrier density. This observation cannot be explained by the simple redox-reaction model, and the interfacial charge screening and band bending need to be considered. Moreover, when the capping oxide layers have the same chemical composition but with different forms, the crystalline 2DES with a large lattice mismatch is more insulating than its amorphous counterpart, and vice versa. Our results shed some light on understanding the different dominant role in forming the bilayer 2DES using crystalline and amorphous oxide capping layer, which may be applicable in designing other functional oxide interfaces.

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Experimental Evidence of t2g Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization

Cited by 11 publications

References 53 publications

Large and tunable spin-orbit effect of 6p orbitals through structural cavities in crystals

Large and tunable spin-orbit effect of 6p orbitals through structural cavities in crystals

Confinement‐Enhanced Rashba Spin–Orbit Coupling at the LaAlO₃/KTaO₃ Interface via LaAlO₃ Thickness Control

Capping-layer-mediated lattice mismatch and redox reaction in SrTiO₃-based bilayers

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Experimental Evidence of t2g Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization

Cited by 11 publications

References 53 publications

Large and tunable spin-orbit effect of 6p orbitals through structural cavities in crystals

Large and tunable spin-orbit effect of 6p orbitals through structural cavities in crystals

Confinement‐Enhanced Rashba Spin–Orbit Coupling at the LaAlO3/KTaO3 Interface via LaAlO3 Thickness Control

Capping-layer-mediated lattice mismatch and redox reaction in SrTiO3-based bilayers

Contact Info

Product

Resources

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Confinement‐Enhanced Rashba Spin–Orbit Coupling at the LaAlO₃/KTaO₃ Interface via LaAlO₃ Thickness Control

Capping-layer-mediated lattice mismatch and redox reaction in SrTiO₃-based bilayers