Influence of electric field and domain structure on the low-temperature Raman spectra of SrTiO<sub>3</sub>

Gibhardt, Holger; Leist, Jeannis; Eckold, G.

doi:10.1088/2053-1591/2/1/015005

Cited by 5 publications

(12 citation statements)

References 34 publications

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“…As seen in Table I and Fig. 3(e) and (f), our data and analysis are consistent with this assignment, provided 16 that b > a in the Raman tensor; we are able to make this assignment because of the relative orientation of the stronger A 1g lobes to the lobes of the B 2g modes which are uniquely defined by only one number. We differ from previous studies in our interpretation of the peaks seen at 145 cm −1 and 448 cm −1 .…”

Section: Resultssupporting

confidence: 83%

“…This anisotropy was noted by Gibhardt et al 16 however to our knowledge its microscopic origin is not known. As emphasized in Fig.…”

Section: Resultsmentioning

confidence: 49%

“…We differ from previous studies in our interpretation of the peaks seen at 145 cm −1 and 448 cm −1 . Some authors have assigned both of these modes to nearly degenerate B 1g and E g phonons 13,14 and others to nearly degenerate B 2g and E g phonons 16,18 . Our experimental data and calculations of I i,B1g (θ) and I i,B2g (θ) are consistent with both of these modes corresponding only to B 2g .…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, assignment of both the 145 cm −1 and 448 cm −1 peaks to B 1g violates this decomposition. This discrepancy seems rooted in whether the true crystal axes or the quasi-cubic axes in the basal plane of the tetragonal structure are used in the symmetry analysis 13,14,16 , since the 45…”

Section: Resultsmentioning

confidence: 99%

“…We confirm and further characterize the anisotropic response of several first-order Raman peaks and demonstrate sensitivity to all possible local tetragonal domain orientations. By comparing experimental data with models, we make assignments of observed peaks to irreducible representations of the D 4h point group differing from those previously reported in the literature 11,[13][14][15][16] . Finally, we demonstrate spatial mapping of a twinned tetragonal domain structure using micro focused Raman imaging, which reproduces the gross features of wide-field imaging, but also shows additional fine structure due to its higher resolution.…”

Section: Introductionmentioning

confidence: 93%

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Orientation-resolved domain mapping in tetragonal SrTiO3 using polarized Raman spectroscopy

Gray¹,

Merz²,

Hikita³

et al. 2016

Phys. Rev. B

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We present microscopically resolved, polarized spectroscopy of Raman scattering collected from tetragonal SrTiO3. The anisotropic response of first order Raman peaks within a single tetragonal domain has been measured. From this data, we assign symmetries to the phonons seen in the first order Raman spectrum which is normally complicated by uncontrolled domain structure. Using a translation stage, we map the local domain orientation of a 3 µm 3 crystal volume near the laser focus and compare it to wide-field polarized images. This technique can be performed with readily available instruments and is relevant to the study of a wide range of related materials, interfaces and devices.

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Section: Resultssupporting

confidence: 83%

“…This anisotropy was noted by Gibhardt et al 16 however to our knowledge its microscopic origin is not known. As emphasized in Fig.…”

Section: Resultsmentioning

confidence: 49%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

See 3 more Smart Citations

Orientation-resolved domain mapping in tetragonal SrTiO3 using polarized Raman spectroscopy

Gray¹,

Merz²,

Hikita³

et al. 2016

Phys. Rev. B

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Vibrational Spectroscopy

Eckold

Schober

2017

Handbook of Solid State Chemistry

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This chapter concentrates on the study of structural excitations in fully relaxed crystalline materials where the atoms vibrate about well‐defined equilibrium positions. It illustrates the power of neutron spectroscopy using selected examples of crystalline materials. The chapter briefly introduces the concept of phonons in the harmonic approximation. It also shows how neutron powder spectroscopy can contribute important information on the dynamics of molecular crystals. The chapter covers a broad range of applications of vibrational spectroscopy using different techniques with special emphasis on neutron scattering. There are a variety of different experimental techniques that are frequently used for optical spectroscopy or inelastic neutron and X‐ray scattering. In most cases it is the competition between high intensity and high resolution that determines the most appropriate method. Infrared (IR) spectroscopy is a technique that is frequently used in chemistry since it allows the assignment of individual modes as fingerprints of specific bonds within molecular or functional groups.

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Polaronic Trions at the MoS₂/SrTiO₃ Interface

et al. 2019

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create mixed dimensional heterostructures [5] of 2D materials and functional substrates, which provide an even wider opportunity to tailor diverse material functionalities and interface phenomena. In this regard, a very promising substrate is SrTiO 3 (STO), a transition metal oxide with an ABO 3 -type perovskite crystal structure, that has attracted significant attention due to both its unusual bulk properties like high dielectric constant, [6] quantum paraelectricity, [7] and several interface phenomena such as the observation of 2D electron gas at interfaces with oxide insulators [8] and enhancement of superconducting T c at the interfaces with 2D FeSe. [9] The speciality of STO lies in its rich phonon spectrum centered on its AFD structural phase transition [10] (from cubic to tetragonal). The uniqueness of the phonons in STO, specifically the low energy soft phonons when compared to conventional phonons present in most materials lies in the following: i) they arise at a phase transition temperature and their frequency (energy) softens to zero near the transition ii) their intensity increases at low temperatures whereas conventionally phonon intensity decreases at lower temperatures The reduced electrical screening in 2D materials provides an ideal platform for realization of exotic quasiparticles, that are robust and whose functionalities can be exploited for future electronic, optoelectronic, and valleytronic applications. Recent examples include an interlayer exciton, where an electron from one layer binds with a hole from another, and a Holstein polaron, formed by an electron dressed by a sea of phonons. Here, a new quasiparticle is reported, "polaronic trion" in a heterostructure of MoS 2 /SrTiO 3 (STO). This emerges as the Fröhlich bound state of the trion in the atomically thin monolayer of MoS 2 and the very unique low energy soft phonon mode (≤7 meV, which is temperature and field tunable) in the quantum paraelectric substrate STO, arising below its structural antiferrodistortive (AFD) phase transition temperature. This dressing of the trion with soft phonons manifests in an anomalous temperature dependence of photoluminescence emission leading to a huge enhancement of the trion binding energy (≈70 meV). The soft phonons in STO are sensitive to electric field, which enables field control of the interfacial trion-phonon coupling and resultant polaronic trion binding energy. Polaronic trions could provide a platform to realize quasiparticle-based tunable optoelectronic applications driven by many body effects.The last few years have witnessed several extraordinary quantum functionalities emerging at interfaces of van der Waals heterostructures. [1][2][3][4] Recently, there has been a growing interest to

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Influence of electric field and domain structure on the low-temperature Raman spectra of SrTiO₃

Cited by 5 publications

References 34 publications

Orientation-resolved domain mapping in tetragonal SrTiO3 using polarized Raman spectroscopy

Orientation-resolved domain mapping in tetragonal SrTiO3 using polarized Raman spectroscopy

Vibrational Spectroscopy

Polaronic Trions at the MoS₂/SrTiO₃ Interface

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Influence of electric field and domain structure on the low-temperature Raman spectra of SrTiO3

Cited by 5 publications

References 34 publications

Orientation-resolved domain mapping in tetragonal SrTiO3 using polarized Raman spectroscopy

Orientation-resolved domain mapping in tetragonal SrTiO3 using polarized Raman spectroscopy

Vibrational Spectroscopy

Polaronic Trions at the MoS2/SrTiO3 Interface

Contact Info

Product

Resources

About

Influence of electric field and domain structure on the low-temperature Raman spectra of SrTiO₃

Polaronic Trions at the MoS₂/SrTiO₃ Interface