Goldstone-like phonon modes in a (111)-strained perovskite

Marthinsen, Astrid; Griffin, Sinéad M.; Moreau, Magnus; Grande, Tor; Tybell, Thomas; Selbach, Sverre M.

doi:10.1103/physrevmaterials.2.014404

Cited by 20 publications

(14 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This prediction was soon confirmed in bulk SMO by partially substituting strontium with barium, which induced negative chemical pressure and led to a polar ferroelectric state [16]. Although a rich phase diagram has been proposed recently for a strained manganite sample from theoretical aspects [17][18][19], the experimental studies in SMO thin films and other related manganite systems so far have been limited to small tensile strain cases (∼1.6%) [20][21][22][23][24][25], and the study for larger tensile strain remains as a great challenge due to the difficulty to maintain the strain state of the film and obtain correct oxygen stoichiometry in synthesizing these samples [26][27][28].…”

mentioning

confidence: 93%

Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin films

et al. 2018

View full text Add to dashboard Cite

Reprinted with permission from the American Physical Society: Guo, J. W., Wang, P. S., Yuan, Y., He, Q., Lu, J. L., Chen, T. Z., Yang, S. Z., Wang, Y. J., Erni, R., Rossell, M. D., Gopalan, V., Xiang, H. J., Tokura, Y. Yu, P. (2018). Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin lms. Physical Review B 97(23): 235135 c 2018 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

show abstract

mentioning

confidence: 93%

Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin films

et al. 2018

View full text Add to dashboard Cite

show abstract

“…It has been debated whether the optical and acoustic vibrational modes of solids can be considered Higgs and Goldstone excitations of the crystal lattice [29]. Several complex transition metal oxide compounds have shown signatures of optical Goldstone-like phonon modes that live in their symmetry-broken potential energy landscape [30][31][32][33][34].Coherent control over Raman-active phonons via impulsive stimulated Raman scattering using visible light pulses is well-established [35,36]. Recently, the excitation of infrared (IR)-active phonons with large amplitudes via IR absorption has become feasible through the development of high intensity terahertz and mid-IR sources.…”

mentioning

confidence: 99%

Parametric Excitation of an Optically Silent Goldstone-Like Phonon Mode

2020

View full text Add to dashboard Cite

It has recently been indicated that the hexagonal manganites exhibit Higgs-and Goldstone-like phonon modes that modulate the amplitude and phase of their primary order parameter. Here, we describe a mechanism by which a silent Goldstone-like phonon mode can be coherently excited, which is based on nonlinear coupling to an infrared-active Higgs-like phonon mode. Using a combination of first-principles calculations and phenomenological modeling, we describe the coupled Higgs-Goldstone dynamics in response to the excitation with a terahertz pulse. Besides theoretically demonstrating coherent control of crystallographic Higgs and Goldstone excitations, we show that the previously inaccessible silent phonon modes can be excited coherently with this mechanism.Order parameters are physical observables that are used to quantify the different states of matter. Their amplitudes and phases can be excited by external stimuli, such as a laser pulse, leading to exotic states of matter that cannot be accessed in equilibrium [1]. Two particular excitations are Higgs and Goldstone modes, which correspond to the modulation of the amplitude and phase of an order parameter that breaks a continuous symmetry. Originally discussed in the context of particle physics [2] and superconductivity [3], Higgs and Goldstone excitations were found in cold atom systems, such as superfluids [4][5][6][7][8] or supersolids [9]. Higgs and Goldstone modes are well-studied in superconductors today [10][11][12][13][14][15][16][17][18][19][20][21], and similar manifestations have recently been reported in charge density wave (CDW) systems [22][23][24], antiferromagnets [25][26][27], and excitonic insulators [28]. It has been debated whether the optical and acoustic vibrational modes of solids can be considered Higgs and Goldstone excitations of the crystal lattice [29]. Several complex transition metal oxide compounds have shown signatures of optical Goldstone-like phonon modes that live in their symmetry-broken potential energy landscape [30][31][32][33][34].Coherent control over Raman-active phonons via impulsive stimulated Raman scattering using visible light pulses is well-established [35,36]. Recently, the excitation of infrared (IR)-active phonons with large amplitudes via IR absorption has become feasible through the development of high intensity terahertz and mid-IR sources. This progress has enabled selective control over the dynamics of the crystal lattice through nonlinear phonon interactions using ionic Raman scattering [37-39] and two-particle absorption mechanisms [40][41][42][43][44][45]. In contrast, phonon modes that do not respond to IR absorption or Raman scattering techniques, so called silent modes, can only be detected through hyper-Raman scattering. As hyper-Raman scattering is a third-order interaction of the electric field component of light with a * djuraschek@seas.harvard.edu † prineha@seas.harvard.edu phonon mode, it is inefficient and no coherent excitation has been achieved yet. Higgs and Goldstone modes, similar to silent p...

show abstract

“…Cold atoms in two-dimensional optical lattices have provided indirect measurement of the Higgs mode at the quantum phase transition between the superfluid and insulating phases, through observation of a finite-frequency response in the superfluid phase [27], consistent with Monte Carlo simulations [28] and the scaling expected for a Higgs mode. Recently, the presence of structural Goldstone and Higgs modes was suggested by first-principles calculations on a strained perovskite oxide, SrMnO 3 [29]. Finally, the observation and manipulation of a Higgs mode has recently been demonstrated in a supersolid quantum gas [30].…”

Section: Introductionmentioning

confidence: 99%

Manifestation of structural Higgs and Goldstone modes in the hexagonal manganites

et al. 2020

View full text Add to dashboard Cite

Structural phase transitions described by Mexican hat potentials should in principle exhibit aspects of Higgs and Goldstone physics. Here, we investigate the relationship between the phonons that soften at such structural phase transitions and the Higgs-and Goldstone-boson analogs associated with the crystallographic Mexican hat potential. We show that, with the exception of systems containing only one atom type, the usual Higgs and Goldstone modes are represented by a combination of several phonon modes, with the lowestenergy phonons of the relevant symmetry having substantial contribution. Taking the hexagonal manganites as a model system, we identify these modes using Landau theory, and predict the temperature dependence of their frequencies using parameters obtained from density functional theory. Separately, we calculate the additional temperature dependence of all phonon mode frequencies arising from thermal expansion within the quasiharmonic approximation. We predict that Higgs-mode softening will dominate the low-frequency vibrational spectrum of InMnO 3 between zero Kelvin and room temperature, whereas the behavior of ErMnO 3 will be dominated by lattice expansion effects. We present temperature-dependent Raman scattering data that support our predictions, in particular confirming the existence of the Higgs mode in InMnO 3 .

show abstract

Goldstone-like phonon modes in a (111)-strained perovskite

Cited by 20 publications

References 60 publications

Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin films

Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin films

Parametric Excitation of an Optically Silent Goldstone-Like Phonon Mode

Manifestation of structural Higgs and Goldstone modes in the hexagonal manganites

Contact Info

Product

Resources

About