A light-induced phononic symmetry switch and giant dissipationless topological photocurrent in ZrTe5

Luo, Liang; Cheng, Di; Song, Boqun; Wang, Lin-Lin; Vaswani, Chirag; Lozano, Pedro; Gu, Genda; Huang, Chih‐Ting; Kim, Richard H. J.; Liu, Zhaoyu; Park, Joong-Mok; Yao, Yongxin; Ho, Kai‐Ming; Perakis, I. E.; Li, Qiang; Wang, Jigang

doi:10.1038/s41563-020-00882-4

Cited by 100 publications

(67 citation statements)

References 41 publications

(41 reference statements)

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“…Angle-resolved photoemission spectroscopy in general, and more specifically the experimental setup used in this study, is compatible with timeresolved studies with femtosecond temporal resolution 40,42,60 . Thus, combining this differential observable with pump-probe schemes could allow following in real-time modification of orbital texture during non-equilibrium topological phase transitions 61,62 , photoinduced orbital order 63 and coherent phonon excitation breaking fundamental symmetries of the materials 64 .…”

Section: Discussionmentioning

confidence: 99%

Unveiling the orbital texture of 1T-TiTe2 using intrinsic linear dichroism in multidimensional photoemission spectroscopy

et al. 2021

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The momentum-dependent orbital character in crystalline solids, referred to as orbital texture, is of capital importance in the emergence of symmetry-broken collective phases, such as charge density waves as well as superconducting and topological states of matter. By performing extreme ultraviolet multidimensional angle-resolved photoemission spectroscopy for two different crystal orientations linked to each other by mirror symmetry, we isolate and identify the role of orbital texture in photoemission from the transition metal dichalcogenide 1T-TiTe2. By comparing our experimental results with theoretical calculations based on both a quantitative one-step model of photoemission and an intuitive tight-binding model, we unambiguously demonstrate the link between the momentum-dependent orbital orientation and the emergence of strong intrinsic linear dichroism in the photoelectron angular distributions. Our results represent an important step towards going beyond band structure (eigenvalues) mapping and learning about electronic wavefunction and orbital texture of solids by exploiting matrix element effects in photoemission spectroscopy.

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Section: Discussionmentioning

confidence: 99%

Unveiling the orbital texture of 1T-TiTe2 using intrinsic linear dichroism in multidimensional photoemission spectroscopy

et al. 2021

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“…The key ingredient is band inversion. Besides searching for new DSMs, inducing topological phase transitions in systems, such as ZrTe 5 [18,19], has also been realized by tuning band inversion with pressure [20], temperature [21], strain [22], and even coherent phonons [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Pressure effect on band inversion in AECd2As2 (AE=Ca, Sr, Ba<

DeStefano

Wang

2021

Phys. Rev. B

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Recent studies have predicted that magnetic EuCd 2 As 2 can host several different topological states depending on its magnetic order, including a single pair of Weyl points. Here we report on the bulk properties and band inversion induced by pressure in the nonmagnetic analogs AECd 2 As 2 (AE = Ca, Sr, Ba) as studied with density functional theory calculations. Under ambient pressure we find that these compounds are narrow band gap semiconductors, in agreement with experiment. The size of the band gap is dictated by both the increasing ionicity across the AE series which tends to increase the band gap, as well as the larger nearest neighbor Cd-As distance from increasing atomic size which can decrease the band gap because the conduction band edge is an antibonding state derived mostly from Cd 5s orbitals. The combination of these two competing effects results in a nonmonotonic change of the band gap size across the AE series with SrCd 2 As 2 having the smallest band gap among the three compounds. The application of negative pressure reduces this band gap and causes the band inversion between the Cd 5s and As 4p orbitals along the -A direction to induce a pair of Dirac points. The topological nature of the Dirac points is then confirmed by finding the closed Fermi arcs on the (10 10) surface.

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“…Afterwards, tremendous interests have been aroused in the searching for symmetry control means and associated new phenomena never have been charted before ( Mueller et al., 2015 ), for example, the discovery of exceptional points in plasmonics by spatial symmetry breaking ( Park et al., 2020 ). And the recent observation of giant anisotropic terahertz (THz) nonlinear currents with vanishing scattering are also disclosed by breaking inversion symmetry in a centrosymmetric Dirac material ZrTe 5 ( Luo et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Terahertz-assisted even harmonics generation in silicon

Ding

Zeng

et al. 2022

iScience

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Summary When a biased electric/light field is applied to centrosymmetric crystals like silicon, the broken symmetry creates even-order harmonics radiation which can reveal key insights into the material. Recently, the second harmonic has been generated by THz-induced symmetry breaking, but the observation of higher-order radiation remains largely unexplored. Here, we demonstrate picosecond-level ultrafast, nondestructive symmetry manipulation of silicon crystal by using a 500 kV/cm intense terahertz (THz) electric field. The THz-induced fourth harmonic of the infrared probe is also observed and characterized for the first time. In addition, we find that the even-order harmonics show no dependence on the THz field direction thus it allows for sub-cycle symmetry manipulations. Our study paves the way toward ultrafast all-optical crystal symmetry control in the future high-speed electronics and photonics.

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A light-induced phononic symmetry switch and giant dissipationless topological photocurrent in ZrTe5

Cited by 100 publications

References 41 publications

Unveiling the orbital texture of 1T-TiTe2 using intrinsic linear dichroism in multidimensional photoemission spectroscopy

Unveiling the orbital texture of 1T-TiTe2 using intrinsic linear dichroism in multidimensional photoemission spectroscopy

Pressure effect on band inversion in AECd2As2 (AE=Ca, Sr, Ba<

Terahertz-assisted even harmonics generation in silicon

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