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Designing spin and orbital sources of Berry curvature at oxide interfaces

Lesne, E.L. (author), Saglam, Y.G. (author), Battilomo, Raffaele (author), Mercaldo, Maria Teresa (author), van Thiel, T.C. (author), Filippozzi, U. (author), Noce, Canio (author), Steele, G.A. (author), Caviglia, A. (author)

Quantum materials can display physical phenomena rooted in the geometry of electronic wavefunctions. The corresponding geometric tensor is characterized by an emergent field known as the Berry curvature (BC). Large BCs typically arise when electronic states with different spin, orbital or sublattice quantum numbers hybridize at finite crystal...

journal article 2023

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Controlling Magnetism with Light in a Zero Orbital Angular Momentum Antiferromagnet

Matthiesen, M. (author), Hortensius, J.R. (author), Mañas Valero, S. (author), Kapon, Itzik (author), Siskins, M. (author), Ivanov, Boris A. (author), van der Zant, H.S.J. (author), Afanasiev, Dmytro (author), Caviglia, A. (author)

Antiferromagnetic materials feature intrinsic ultrafast spin dynamics, making them ideal candidates for future magnonic devices operating at THz frequencies. A major focus of current research is the investigation of optical methods for the efficient generation of coherent magnons in antiferromagnetic insulators. In magnetic lattices endowed...

journal article 2023

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Ultrafast activation of the double-exchange interaction in antiferromagnetic manganites

Hortensius, J.R. (author), Afanasiev, D. (author), Vistoli, L. (author), Matthiesen, M. (author), Bibes, M. (author), Caviglia, A. (author)

In doped manganite systems, strong electronic correlations result in rich phase diagrams where electron delocalization strongly affects the magnetic order. Here, we employ a femtosecond all-optical pump-probe scheme to impulsively photodope the antiferromagnetic parent manganite system CaMnO₃ and unveil the formation dynamics of a...

journal article 2023

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Gate-tunable pairing channels in superconducting non-centrosymmetric oxides nanowires

Singh, Gyanendra (author), Guarcello, Claudio (author), Lesne, E.L. (author), Winkler, Dag (author), Claeson, Tord (author), Bauch, Thilo (author), Lombardi, Floriana (author), Caviglia, A. (author), Citro, Roberta (author)

Two-dimensional SrTiO₃-based interfaces stand out among non-centrosymmetric superconductors due to their intricate interplay of gate-tunable Rashba spin-orbit coupling and multi-orbital electronic occupations, whose combination theoretically prefigures various forms of non-standard superconductivity. By employing superconducting...

journal article 2022

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Self-Sealing Complex Oxide Resonators

Lee, M. (author), Robin, M.P. (author), Guis, R.H. (author), Filippozzi, U. (author), Shin, D. (author), van Thiel, T.C. (author), Paardekooper, Stijn P. (author), Renshof, Johannes R. (author), van der Zant, H.S.J. (author), Caviglia, A. (author), Verbiest, G.J. (author), Steeneken, P.G. (author)

Although 2D materials hold great potential for next-generation pressure sensors, recent studies revealed that gases permeate along the membrane-surface interface, necessitating additional sealing procedures. In this work, we demonstrate the use of free-standing complex oxides as self-sealing membranes that allow the reference cavity beneath...

journal article 2022

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Ultrathin Piezoelectric Resonators Based on Graphene and Free-Standing Single-Crystal BaTiO₃

Lee, M. (author), Renshof, Johannes R. (author), van Zeggeren, K.J. (author), Houmes, M.J.A. (author), Lesne, E.L. (author), Siskins, M. (author), van Thiel, T.C. (author), Guis, R.H. (author), van Blankenstein, M.R. (author), Verbiest, G.J. (author), Caviglia, A. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author)

Suspended piezoelectric thin films are key elements enabling high-frequency filtering in telecommunication devices. To meet the requirements of next-generation electronics, it is essential to reduce device thickness for reaching higher resonance frequencies. Here, the high-quality mechanical and electrical properties of graphene electrodes...

journal article 2022

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Electrostatically Driven Polarization Flop and Strain-Induced Curvature in Free-Standing Ferroelectric Superlattices

Li, Yaqi (author), Zatterin, Edoardo (author), Conroy, Michele (author), Pylypets, Anastasiia (author), Borodavka, Fedir (author), Björling, Alexander (author), Groenendijk, D.J. (author), Lesne, E.L. (author), Caviglia, A. (author)

The combination of strain and electrostatic engineering in epitaxial heterostructures of ferroelectric oxides offers many possibilities for inducing new phases, complex polar topologies, and enhanced electrical properties. However, the dominant effect of substrate clamping can also limit the electromechanical response and often leaves...

journal article 2022

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Controlling the anisotropy of a van der Waals antiferromagnet with light

Afanasiev, D. (author), Hortensius, J.R. (author), Matthiesen, M. (author), Siskins, M. (author), Lee, M. (author), Lesne, E.L. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author), Ivanov, B. (author), Caviglia, A. (author)

Van der Waals magnets provide an ideal playground to explore the fundamentals of low-dimensional magnetism and open opportunities for ultrathin spin-processing devices. The Mermin-Wagner theorem dictates that as in reduced dimensions isotropic spin interactions cannot retain long-range correlations, the long-range spin order is stabilized by...

journal article 2021

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Non-universal current flow near the metal-insulator transition in an oxide interface

Persky, Eylon (author), Vardi, Naor (author), Monteiro, Ana Mafalda R.V.L. (author), van Thiel, T.C. (author), Yoon, Hyeok (author), Xie, Yanwu (author), Fauqué, Benoît (author), Caviglia, A. (author), Hwang, Harold Y. (author)

In systems near phase transitions, macroscopic properties often follow algebraic scaling laws, determined by the dimensionality and the underlying symmetries of the system. The emergence of such universal scaling implies that microscopic details are irrelevant. Here, we locally investigate the scaling properties of the metal-insulator...

journal article 2021

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Coupling Charge and Topological Reconstructions at Polar Oxide Interfaces

van Thiel, T.C. (author), Brzezicki, W. (author), Autieri, C. (author), Hortensius, J.R. (author), Afanasiev, D. (author), Janssen, N. (author), Groenendijk, D.J. (author), Van Aert, S. (author), Caviglia, A. (author)

In oxide heterostructures, different materials are integrated into a single artificial crystal, resulting in a breaking of inversion symmetry across the heterointerfaces. A notable example is the interface between polar and nonpolar materials, where valence discontinuities lead to otherwise inaccessible charge and spin states. This approach...

journal article 2021

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Nanopatterning of weak links in superconducting oxide interfaces

Singh, Gyanendra (author), Lesne, E.L. (author), Winkler, Dag (author), Claeson, Tord (author), Bauch, Thilo (author), Lombardi, Floriana (author), Caviglia, A. (author), Kalaboukhov, Alexei (author)

The interface between two wide band-gap insulators, LaAlO₃ and SrTiO₃ (LAO/STO), hosts a quasi-two-dimensional electron gas (q2DEG), two-dimensional superconductivity, ferromagnetism, and giant Rashba spin-orbit coupling. The co-existence of two-dimensional superconductivity with gate-tunable spin-orbit coupling and...

journal article 2021

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Ultrafast control of magnetic interactions via light-driven phonons

Afanasiev, D. (author), Hortensius, J.R. (author), Ivanov, B. (author), Sasani, A. (author), Bousquet, E. (author), Blanter, Y.M. (author), Mikhaylovskiy, R. V. (author), Kimel, A. V. (author), Caviglia, A. (author)

Resonant ultrafast excitation of infrared-active phonons is a powerful technique with which to control the electronic properties of materials that leads to remarkable phenomena such as the light-induced enhancement of superconductivity^1,2, switching of ferroelectric polarization^3,4 and ultrafast insulator-to-metal...

journal article 2021

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Extraordinary Hall balance in ultrathin SrRuO₃ bilayers

van Thiel, T.C. (author), Groenendijk, D.J. (author), Caviglia, A. (author)

The correlated 4d transition metal oxide SrRuO₃ (SRO) features an anomalous Hall effect that originates from momentum-space sources of Berry curvature and depends sensitively on the magnetization. Here, we exploit this sensitivity and realize an epitaxial extraordinary Hall balance device, consisting of two ultrathin layers of SRO,...

journal article 2020

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Ultrafast strain engineering and coherent structural dynamics from resonantly driven optical phonons in LaAlO₃

Hortensius, J.R. (author), Afanasiev, D. (author), Sasani, A. (author), Bousquet, E. (author), Caviglia, A. (author)

Strain engineering has been extended recently to the picosecond timescales, driving ultrafast metal–insulator phase transitions and the propagation of ultrasonic demagnetization fronts. However, the nonlinear lattice dynamics underpinning interfacial optoelectronic phase switching have not yet been addressed. Here we perform time-resolved all...

journal article 2020

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Coupling Lattice Instabilities across the Interface in Ultrathin Oxide Heterostructures

van Thiel, T.C. (author), Fowlie, Jennifer (author), Autieri, Carmine (author), Manca, Nicola (author), Siskins, M. (author), Afanasiev, D. (author), Gariglio, Stefano (author), Caviglia, A. (author)

Oxide heterointerfaces constitute a rich platform for realizing novel functionalities in condensed matter. A key aspect is the strong link between structural and electronic properties, which can be modified by interfacing materials with distinct lattice symmetries. Here, we determine the effect of the cubic-tetragonal distortion of SrTiO<sub...

journal article 2020

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Berry phase engineering at oxide interfaces

Groenendijk, D.J. (author), van Thiel, T.C. (author), Hortensius, J.R. (author), Afanasiev, D. (author), Van Den Bos, K. H.W. (author), Van Aert, S. (author), Filippetti, A. (author), Picozzi, S. (author), Caviglia, A. (author)

Three-dimensional strontium ruthenate (SrRuO3) is an itinerant ferromagnet that features Weyl points acting as sources of emergent magnetic fields, anomalous Hall conductivity, and unconventional spin dynamics. Integrating SrRuO3 in oxide heterostructures is potentially a novel route to engineer emergent electrodynamics, but its electronic...

journal article 2020

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Anisotropic magnetoresistance in spin–orbit semimetal SrIrO ₃

Groenendijk, D.J. (author), Manca, N. (author), de Bruijckere, J. (author), Monteiro, Ana Mafalda R.V.L. (author), Gaudenzi, R. (author), van der Zant, H.S.J. (author), Caviglia, A. (author)

SrIrO ₃, the three-dimensional member of the Ruddlesden–Popper iridates, is a paramagnetic semimetal characterised by a the delicate interplay between spin–orbit coupling and Coulomb repulsion. In this work, we study the anisotropic magnetoresistance (AMR) of SrIrO ₃ thin films, which is closely linked to spin–orbit...

journal article 2020

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Ultrathin complex oxide nanomechanical resonators

Davidovikj, D. (author), Groenendijk, D.J. (author), Monteiro, A. M.R.V.L. (author), Dijkhoff, A. (author), Afanasiev, D. (author), Siskins, M. (author), van der Zant, H.S.J. (author), Caviglia, A. (author), Steeneken, P.G. (author)

Complex oxide thin films and heterostructures exhibit a variety of electronic phases, often controlled by the mechanical coupling between film and substrate. Recently it has become possible to isolate epitaxially grown single-crystalline layers of these materials, enabling the study of their properties in the absence of interface effects. In...

journal article 2020

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Temperature dependent inverse spin Hall effect in Co/Pt spintronic emitters

Matthiesen, M. (author), Afanasiev, D. (author), Hortensius, J.R. (author), van Thiel, T.C. (author), Medapalli, R. (author), Fullerton, E. E. (author), Caviglia, A. (author)

In bilayers of ferromagnets and heavy metals, which form the so-called spintronic emitters, the phenomena of ultrafast demagnetization and the inverse spin Hall effect (ISHE) conspire to yield remarkably efficient emission of electric pulses in the THz band. Light-induced demagnetization of the ferromagnet launches a pulse of spin current...

journal article 2020

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A spin-orbit playground: Surfaces and interfaces of transition metal oxides

Gariglio, S. (author), Caviglia, A. (author), Triscone, J. M. (author), Gabay, M. (author)

Within the last twenty years, the status of the spinorbit interaction has evolved from that of a simple atomic contribution to a key effect that modifies the electronic band structure of materials. It is regarded as one of the basic ingredients for spintronics, locking together charge and spin degrees of freedom and recently it is...

review 2019