A review on terahertz photogalvanic spectroscopy of Bi2Te3- and Sb2Te3-based three dimensional topological insulators

Plank, H.; Ganichev, Sergey

doi:10.1016/j.sse.2018.06.002

Cited by 32 publications

(33 citation statements)

References 57 publications

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“…Photogalvanic effects have been studied extensively for 2D electron gases in III-V semiconductors [89]. Furthermore, they have been applied both experimentally and theoretically to van der Waals materials, including 3D topological insulators [58,59,62,[93][94][95][96][97][98][99], 2D TMDs [17,18,100], WS 2 nanotubes [101], polar van der Waals materials [102,103], and layered Weyl semimetals [104][105][106][107]. Photogalvanic currents form an effective toolbox to explore fundamental optoelectronic symmetries.…”

Section: General Symmetry Considerations For Light-driven Currentsmentioning

confidence: 99%

“…For example, single-layer graphene is inversion symmetric, and a circular photogalvanic effect becomes possible only for a reduced symmetry, which is achieved at crystal edges or by a substrate-induced symmetry breaking [108,109]. A further example is the topological insulator Bi 2 Se 3 , where the bulk inversion symmetry precludes the occurrence of a bulk photogalvanic effect by symmetry [94]. At the surface, however, the crystal symmetry is reduced, and a photogalvanic effect becomes symmetry-allowed under an oblique angle of incidence [61].…”

Section: General Symmetry Considerations For Light-driven Currentsmentioning

confidence: 99%

“…Layered three-dimensional topological insulators, such as Bi 2 Te 3 , Bi 2 Se 3 , and Bi 2 Te 2 Se have emerged as promising materials for optoelectronic applications from infrared down to THz frequencies [66,87,94]. As a consequence of strong spin-orbit coupling, these materials exhibit topological surface states forming a Dirac cone with helical spin texture, which interconnect the band gap between valence and conduction bands of the bulk band structure [163,164].…”

Section: Ultrafast Helicity Control Of Surface Currents In Topologicamentioning

confidence: 99%

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Light-field and spin-orbit-driven currents in van der Waals materials

et al. 2020

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AbstractThis review aims to provide an overview over recent developments of light-driven currents with a focus on their application to layered van der Waals materials. In topological and spin-orbit dominated van der Waals materials helicity-driven and light-field-driven currents are relevant for nanophotonic applications from ultrafast detectors to on-chip current generators. The photon helicity allows addressing chiral and non-trivial surface states in topological systems, but also the valley degree of freedom in two-dimensional van der Waals materials. The underlying spin-orbit interactions break the spatiotemporal electrodynamic symmetries, such that directed currents can emerge after an ultrafast laser excitation. Equally, the light-field of few-cycle optical pulses can coherently drive the transport of charge carriers with sub-cycle precision by generating strong and directed electric fields on the atomic scale. Ultrafast light-driven currents may open up novel perspectives at the interface between photonics and ultrafast electronics.

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Section: General Symmetry Considerations For Light-driven Currentsmentioning

confidence: 99%

Section: General Symmetry Considerations For Light-driven Currentsmentioning

confidence: 99%

Section: Ultrafast Helicity Control Of Surface Currents In Topologicamentioning

confidence: 99%

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Light-field and spin-orbit-driven currents in van der Waals materials

et al. 2020

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“…Photogalvanic spectroscopy of topological insulators is of particular interest since the photocurrents associated with edges can be experimentally separated from the photocurrents stemming from the bulk of the structure. The edge and bulk contributions to the photoresponse have, as a rule, different polarization dependence.…”

Section: Introductionmentioning

confidence: 99%

High‐Frequency Nonlinear Transport and Photogalvanic Effects in 2D Topological Insulators

Durnev

Tarasenko

2019

Annalen der Physik

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Excitation of a topological insulator by a high-frequency electric field of a laser radiation leads to a dc electric current in the helical edge channel whose direction and magnitude are sensitive to the radiation polarization and depend on the physical properties of the edge. An overview of theoretical and experimental studies of such edge photoelectric effects in 2D topological insulators based on semiconductor quantum wells is presented. First, a phenomenological description is given of edge photocurrents, which may originate from the photogalvanic effects or the photon drag effects, for edges of all possible symmetry. Then, microscopic mechanisms of photocurrent generation for different types of optical transitions involving helical edge states are discussed. They include direct and indirect optical transitions within the edge channel and edge-to-bulk optical transitions.

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“…Another experimental approach used for instance in the papers [12][13][14][15][16][17] implies an optoelectronic access to surface electron states. In many cases, photoelectric effects, such as photogalvanic effect [12][13][14] and photoelectromagnetic effect [15][16][17] are not sensitive to the bulk conductivity, even if the bulk free carrier concentration is high.…”

mentioning

confidence: 99%

Apparent PT-symmetric terahertz photoconductivity in the topological phase of Hg1−xCdxTe-based structures

Galeeva

Kazakov

Artamkin

et al. 2020

Sci Rep

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We show that the terahertz (tHz) photoconductivity in the topological phase of Hg 1-x cd x te-based structures exhibits the apparent PT-(parity-time) symmetry whereas the P-symmetry and the Tsymmetry, separately, are not conserved. Moreover, it is demonstrated that the P-and T-symmetry breaking may not be related to any type of the sample anisotropy. this result contradicts the apparent symmetry arguments and means that there exists an external factor that interacts with the sample electronic system and breaks the symmetry. We show that deviations from the ideal experimental geometry may not be such a factor. Scientific RepoRtS |

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A review on terahertz photogalvanic spectroscopy of Bi2Te3- and Sb2Te3-based three dimensional topological insulators

Cited by 32 publications

References 57 publications

Light-field and spin-orbit-driven currents in van der Waals materials

Light-field and spin-orbit-driven currents in van der Waals materials

High‐Frequency Nonlinear Transport and Photogalvanic Effects in 2D Topological Insulators

Apparent PT-symmetric terahertz photoconductivity in the topological phase of Hg1−xCdxTe-based structures

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