Effect of trigonal warping on the Berry curvature and valley/spin Hall effects in monolayer MoS2

Chen, Wang; Zhou, Xiaoying; Liu, Pu; Xiao, Xunwen; Zhou, Guanghui

doi:10.1016/j.physleta.2020.126344

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…15 we show a simplified model in one dimension in reciprocal space to explain the effect of a lateral electric field on the exciton dispersion and polariton polarization. First, we plot the energy dispersion for single carriers at the K and K’ valleys taking into account the trigonal warp effect by considering a two-band k·p model up to third order in the crystal momentum 48 , 49 . For simplicity, we focus on the crystal direction k x , with x being the axis along the zigzag direction of the lattice, where the electric field is applied.…”

Section: Methodsmentioning

confidence: 99%

Room-temperature electrical control of polarization and emission angle in a cavity-integrated 2D pulsed LED

et al. 2022

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Devices based on two-dimensional (2D) semiconductors hold promise for the realization of compact and versatile on-chip interconnects between electrical and optical signals. Although light emitting diodes (LEDs) are fundamental building blocks for integrated photonics, the fabrication of light sources made of bulk materials on complementary metal-oxide-semiconductor (CMOS) circuits is challenging. While LEDs based on van der Waals heterostructures have been realized, the control of the emission properties necessary for information processing remains limited. Here, we show room-temperature electrical control of the location, directionality and polarization of light emitted from a 2D LED operating at MHz frequencies. We integrate the LED in a planar cavity to couple the polariton emission angle and polarization to the in-plane exciton momentum, controlled by a lateral voltage. These findings demonstrate the potential of TMDCs as fast, compact and tunable light sources, promising for the realization of electrically driven polariton lasers.

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Section: Methodsmentioning

confidence: 99%

Room-temperature electrical control of polarization and emission angle in a cavity-integrated 2D pulsed LED

et al. 2022

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“…Therefore, the spin and valley Hall conductance can be tuned by controlling the warping term. [43] On the other hand, the symmetry of our system and Berry curvatures are C 3v when the trigonal warping term is included. Thus, the nonlinear Hall effect in warped TMDC is absent.…”

Section: Berry Curvature and Geometric Tensormentioning

confidence: 95%

Nonlinear photoncurrent in transition metal dichalcogenide with warping term under illuminating of light*

Zhu¹,

Yang²,

Zhang³

2021

Chinese Phys. B

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We investigate the photoconductivities of injection current and the shift current in transition metal dichalcogenide with warping term in the presence of sublattice potential and spin orbit coupling. The system shows the valley photoconductivities of injection current and the photoconductivities of shift current. It is found that the warping term and the geometric tensor play a critical role in the system, which are responsible for the photoconductivities. Due to the interplay between the sublattice potential and the spin orbit coupling, the photoconductivities can be tuned. Furthermore, the effect of warping term on geometric tensor and the amplitude of the photoconductivities are also discussed.

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Transport properties in a monolayer MoS2 with time-periodic potential

Sattari

Mirershadi

2023

Indian J Phys

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Effect of trigonal warping on the Berry curvature and valley/spin Hall effects in monolayer MoS2

Cited by 6 publications

References 14 publications

Room-temperature electrical control of polarization and emission angle in a cavity-integrated 2D pulsed LED

Room-temperature electrical control of polarization and emission angle in a cavity-integrated 2D pulsed LED

Nonlinear photoncurrent in transition metal dichalcogenide with warping term under illuminating of light*

Transport properties in a monolayer MoS2 with time-periodic potential

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