Controllable valley magnetic response in phase-transformed tungsten diselenide

Haiyang Liu; Zongnan Zhang; Yingqiu Li; Yaping Wu; Zhiming Wu; Xu Li; Chunmiao Zhang; Feiya Xu; Junyong Kang

doi:10.1117/1.APN.2.2.026007

Journals >Advanced Photonics Nexus >Volume 2 >Issue 2 >Page 026007 > Article

Advanced Photonics Nexus
Vol. 2, Issue 2, 026007 (2023)

Controllable valley magnetic response in phase-transformed tungsten diselenide | Article Video

Haiyang Liu^1、2, Zongnan Zhang¹, Yingqiu Li¹, Yaping Wu^1、*, Zhiming Wu^1、*, Xu Li¹, Chunmiao Zhang¹, Feiya Xu¹, and Junyong Kang¹

Author Affiliations

¹Xiamen University, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Department of Physics, Xiamen, China

²Nanyang Technological University, School of Electrical and Electronic Engineering, Singapore

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DOI: 10.1117/1.APN.2.2.026007 Cite this Article Set citation alerts

Haiyang Liu, Zongnan Zhang, Yingqiu Li, Yaping Wu, Zhiming Wu, Xu Li, Chunmiao Zhang, Feiya Xu, Junyong Kang. Controllable valley magnetic response in phase-transformed tungsten diselenide[J]. Advanced Photonics Nexus, 2023, 2(2): 026007 Copy Citation Text

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(a) Optical topography of the CVD-grown large-scale WSe2 monolayer on SiO2/Si surface, where the tweezer trace shows the distinction between WSe2 film and the substrate. (b), (c) HRTEM image and SAED pattern of monolayer H/T-WSe2. (d) XPS of monolayer H/T-WSe2. The blue and purple shadows correspond to the components of H and T phases, respectively. (e) I–V curves of monolayer H-WSe2 and H/T-WSe2 with the T-phase components of 12.2% and 19.9%. (f) Atomic structure of monolayer H/T-WSe2, and the differential charge densities of top Se, W, and bottom Se atomic layers. The scale bar from blue to red denotes the change from depletion to accumulation.

Fig. 1. (a) Optical topography of the CVD-grown large-scale

{WSe}_{2}

monolayer on

{SiO}_{2} / Si

surface, where the tweezer trace shows the distinction between

{WSe}_{2}

film and the substrate. (b), (c) HRTEM image and SAED pattern of monolayer

H / T - {WSe}_{2}

. (d) XPS of monolayer

H / T - {WSe}_{2}

. The blue and purple shadows correspond to the components of H and T phases, respectively. (e)

I – V

curves of monolayer

H - {WSe}_{2}

and

H / T - {WSe}_{2}

with the T-phase components of 12.2% and 19.9%. (f) Atomic structure of monolayer

H / T - {WSe}_{2}

, and the differential charge densities of top Se, W, and bottom Se atomic layers. The scale bar from blue to red denotes the change from depletion to accumulation.

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Circularly polarized PL spectra of H/T-WSe2-19.9% under (a)–(d) positive magnetic fields from 1 to 4 T and (e)–(h) negative magnetic field from −1 to −4 T. The blue and purple lines indicate co- and cross-polarized configurations, respectively.

Fig. 2. Circularly polarized PL spectra of

H / T - {WSe}_{2} - 19.9 %

under (a)–(d) positive magnetic fields from 1 to 4 T and (e)–(h) negative magnetic field from

- 1

to −4 T. The blue and purple lines indicate co- and cross-polarized configurations, respectively.

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Fig. 3. Magnetic-dependent polarization of (a)

H / T - {WSe}_{2} - 12.2 %

and (b)

H / T - {WSe}_{2} - 19.9 %

under

σ^{-}

excitation with

σ^{-}

and

σ^{+}

detection. The red dots indicate the measurement data. The dark blue, light blue, and pink lines show slopes from 0 to

\pm 1 T

\pm 1

\pm 2 T

, and

\pm 2

\pm 4 T

, respectively. Spin density isosurface plots of (c)

H - {WSe}_{2}

and (d)

H / T - {WSe}_{2}

. The W and Se atoms are denoted by the blue and yellow balls, respectively. The isosurface in pink represents the majority spin density. Total spin DOSs of monolayers (e)