Metastable ferroelectricity in optically strained SrTiO3

  title={Metastable ferroelectricity in optically strained SrTiO3},
  author={Tobia F. Nova and Ankit S. Disa and Martin Fechner and Andrea Cavalleri},
  pages={1075 - 1079}
Driving strontium titanate ferroelectric Hidden phases are metastable collective states of matter that are typically not accessible on equilibrium phase diagrams. Nova et al. used infrared pulses to excite higher-frequency lattice modes that drive the crystal into a metastable ferroelectric phase, a phase that can persist for many hours. X. Li et al. used terahertz fields to drive the soft mode that moves the ions in the crystal into the positions they occupy in the new phase. The ferroelectric… 
Photoinduced evolution of lattice orthorhombicity and conceivably enhanced ferromagnetism in LaMnO3 membranes
Ultrashort laser pulses have been utilized to dynamically drive phase transitions in correlated quantum materials. Of particular interest is whether phases not achievable in thermal equilibrium can
Evidence for metastable photo-induced superconductivity in K3C60
Far and mid infrared optical pulses have been shown to induce non-equilibrium unconventional orders in complex materials, including photo-induced ferroelectricity in quantum paraelectrics, magnetic
Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO3
A quantum paraelectric SrTiO3 is a material situated in close proximity to a quantum critical point (QCP) of ferroelectric transition in which the critical temperature to the ferroelectric state is
Presence of Delocalized Ti 3d Electrons in Ultrathin Single-Crystal SrTiO3.
Strontium titanate (STO), with a wide spectrum of emergent properties such as ferroelectricity and superconductivity, has received significant attention in the community of strongly correlated
Ultrafast switching to an insulating-like metastable state by amplitudon excitation of a charge density wave
In correlated electron materials, multiple electronic phases may appear next to each other in their phase diagram, and these can be tuned, for example, by applying static pressure or chemical
Nonvolatile Electric-Field Control of Inversion Symmetry
In condensed-matter systems, competition between ground states at phase boundaries can lead to significant changes in material properties under external stimuli, particularly when these ground states
Ultrafast Ferroelectric Ordering on the Surface of a Topological Semimetal MoTe2
Transient tuning of material properties by light usually requires intense laser fields in the nonlinear excitation regime. Here, we report ultrafast ferroelectric ordering on the surface of a
Light-Driven Topological and Magnetic Phase Transitions in Thin Layer Antiferromagnets
We theoretically study the effect of low-frequency light pulses in resonance with phonons in the topological and magnetically ordered two-septuple layer (2-SL) MnBi2Te4 (MBT) and MnSb2Te4 (MST).
Switching to Hidden Metallic Crystal Phase in Phase-Change Materials by Photoenhanced Metavalent Bonding.
Metavalent bonding is crucial for the determination of phase transition and improvement of device performance in phase-change materials, which are attracting interest for use in memory devices.
Field-induced ultrafast modulation of Rashba coupling at room temperature in ferroelectric $\alpha$-GeTe(111)
spintronics strong spin-orbit Its room temperature ferroelectricity demonstrated as a route towards a new type of highly energy-efficient non-volatile memory device based on switchable polarization.


Room-temperature ferroelectricity in strained SrTiO3
It is shown that epitaxial strain from a newly developed substrate can be harnessed to increase Tc by hundreds of degrees and produce room-temperature ferro electricity in strontium titanate, a material that is not normally ferroelectric at any temperature.
Perfect softening of the ferroelectric mode in the isotope-exchanged strontium titanate of SrTi18O3 studied by light scattering.
The mechanism of the phase transition is concluded to be an ideal displacive-type accompanied with perfect softening of the Slater-type polar mode.
Ultrafast Relaxation Dynamics of the Antiferrodistortive Phase in Ca Doped SrTiO_{3}.
Time-dependent density-functional-theory calculations show that the fast response can be ascribed to an ultrafast displacive modification of the soft-mode potential towards the normal state induced by holes created in the oxygen 2p states.
Ferroelectricity at the Nanoscale: Local Polarization in Oxide Thin Films and Heterostructures
Not only can the necessary high-quality ferroelectric films now be grown for new device capabilities, but ferroelectrics can be combined with other functional oxides, such as high-temperature superconductors and magnetic oxide, to create multifunctional materials and devices.
Evidence for competing orderings in strontium titanate from hyper-Raman scattering spectroscopy
The frequencies of the softest polar optic phonons of tetragonal SrTiO3 are accurately determined using high-resolution hyper-Raman spectroscopy on oriented-domain crystals. The splitting of the
Strain-gradient-induced polarization in SrTiO3 single crystals.
Estimates indicate that local polarization around defects in SrTiO3 may exceed the largest ferroelectric polarizations, and a sign reversal of the flexoelectric response detected below the phase transition suggests that the ferroelastic domain walls of SrTi O3 may be polar.
Efficient excitation of nonlinear phonons via chirped pulses: Induced structural phase transitions
Nonlinear phononics play important role in strong laser-solid interactions. We discuss nonlinear dynamical protocols which allow for efficient excitation and control of nonlinear phonons. We consider
Theory of nonlinear phononics for coherent light control of solids
We present a microscopic theory for ultrafast control of solids with high-intensity terahertz frequency optical pulses. When resonant with selected infrared-active vibrations, these pulses
An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc
The control of non-equilibrium phenomena in complex solids is an important research frontier, encompassing new effects like light induced superconductivity. Here, we show that coherent optical
Ferroelectricity in strain-free SrTiO3 thin films.
All SrTiO3 films and bulk crystals are relaxor ferroelectrics, and the role of strain is to stabilize longer-range correlation of preexisting nanopolar regions, likely originating from minute amounts of unintentional Sr deficiency in nominally stoichiometric samples.