Helicity-dependent photocurrent in a 
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 thin film probed by terahertz emission spectroscopy

Hamh, Sun Young; Park, Soon-Hee; Jerng, Sahng‐Kyoon; Jeon, Jae Ho; Chun, Seung‐Hyun; Lee, Jong Seok

doi:10.1103/physrevb.94.161405

Cited by 43 publications

(42 citation statements)

References 29 publications

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“…In the case of Bi 2 Se 3 , the carrier relaxation time in TSSs is ∼10 ps at 70 K [32], and the estimated frequency of the terahertz emissions from Bi 2 Se 3 would be ∼0.1 THz, which is close to the results (∼0.23 THz) of Ref. [38]. For Sb 2 Te 3 at room temperature, the carrier relaxation time in the TSSs is ∼1.2 ps from time-resolved ARPES results [22].…”

Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

“…Recently, some TI-terahertz-emission works based on circularly polarized excitation have been reported, and these works either use circular dichroism or single delay-time analysis [37,38]. Helicity-dependent terahertz emission measurements of Bi 2 Se 3 thin films have been demonstrated, and a threefold periodicity with a constant offset in azimuthal scan has been observed [38]. This observation has been ascribed to circular photon drag effect, and the origin of the constant offset part is still unclear due to the limited information from experimental results and model fitting [38].…”

Section: Resultsmentioning

confidence: 99%

“…Helicity-dependent terahertz emission measurements of Bi 2 Se 3 thin films have been demonstrated, and a threefold periodicity with a constant offset in azimuthal scan has been observed [38]. This observation has been ascribed to circular photon drag effect, and the origin of the constant offset part is still unclear due to the limited information from experimental results and model fitting [38]. Regarding transientcurrent radiation, the frequency of few-cycle terahertz pulses are inversely proportional to the carrier relaxation time.…”

Section: Resultsmentioning

confidence: 99%

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Helicity-dependent terahertz emission spectroscopy of topological insulator Sb2Te3 thin films

Chen

Huang

et al. 2017

Phys. Rev. B

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We report on helicity-dependent terahertz emissions that originate from the helicity-dependent photocurrents in topological insulator Sb 2 Te 3 thin films due to ultrafast optical excitation. The polarity of the emitted terahertz radiation is controlled by both the incident angle and the helicity of optical pulses. Using an unprecedented decomposition-recombination procedure in the time domain, the signals of the Dirac fermions are fully separated from bulk contributions. These results provide insights into the optical coupling of topological surface states and open up opportunities for applying helicity-dependent terahertz emission spectroscopy in spintronics.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Helicity-dependent terahertz emission spectroscopy of topological insulator Sb2Te3 thin films

Chen

Huang

et al. 2017

Phys. Rev. B

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“…For example, tuning the nonlinear response using external magnetic fields, strain or by combining graphene with other 2D materials will lead to new insights. Moving beyond graphene, similar effects have been already studied in topological insulators and applied for their characterization and considered theoretically for Weyl semimetals . They are also expected for boron nitride and transition metal dichalcogenieds.…”

Section: Discussionmentioning

confidence: 89%

Terahertz Electric Field Driven Electric Currents and Ratchet Effects in Graphene

2017

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Terahertz field induced photocurrents in graphene were studied experimentally and by microscopic modeling. Currents were generated by cw and pulsed laser radiation in large area as well as small-size exfoliated graphene samples. We review general symmetry considerations leading to photocurrents depending on linear and circular polarized radiation and then present a number of situations where photocurrents were detected. Starting with the photon drag effect under oblique incidence, we proceed to the photogalvanic effect enhancement in the reststrahlen band of SiC and edge-generated currents in graphene. Ratchet effects were considered for in-plane magnetic fields and a structure inversion asymmetry as well as ratchets by non-symmetric patterned top gates. Lastly, we demonstrate that graphene can be used as a fast, broadband detector of terahertz radiation.

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Polarized THz Emission from In‐Plane Dipoles in Monolayer Tungsten Disulfide by Linear and Circular Optical Rectification

Zhang

Huang

Zhu

et al. 2019

Advanced Optical Materials

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Recent advances in the development of polarized terahertz (THz) emission from nanomaterials have not only opened up a new “TeraNano” interdiscipline but also provided a new tool for nonlinear optical process research. Herein, THz radiation mechanism of monolayer tungsten disulfide (WS2) is first investigated by both linear and circular polarization laser excitations at room temperature. The results reveal that polarized THz emission is dominated by the optical rectification based on in‐plane nonlinear dipoles, which is totally different from that of bulk WS2. The mechanism is verified by the azimuthal angle and pump polarization angle dependence of THz emission in both experiment and theory. Furthermore, controllably elliptically polarized THz emission is observed with the maximum ellipticity of ≈0.52 based on nonresonant nonlinear process under the circularly polarized excitation. A clear understanding of THz radiation mechanism of 2D materials will facilitate further design, optimization, and polarization control of integrable 2D THz optoelectronics.

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Helicity-dependent photocurrent in a Bi2Se3 thin film probed by terahertz emission spectroscopy

Cited by 43 publications

References 29 publications

Helicity-dependent terahertz emission spectroscopy of topological insulator Sb2Te3 thin films

Helicity-dependent terahertz emission spectroscopy of topological insulator Sb2Te3 thin films

Terahertz Electric Field Driven Electric Currents and Ratchet Effects in Graphene

Polarized THz Emission from In‐Plane Dipoles in Monolayer Tungsten Disulfide by Linear and Circular Optical Rectification

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