Interlayer orientation-dependent light absorption and emission in monolayer semiconductor stacks

Hoseok Heo, Ji Ho Sung, Soonyoung Cha, Bo-Gyu Jang, Joo-Youn Kim, Gangtae Jin, Donghun Lee, Ji-Hoon Ahn, Myoung-Jae Lee, Ji Hoon Shim, Hyunyong Choi and Moon-Ho Jo ()
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Hoseok Heo: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS)
Ji Ho Sung: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS)
Soonyoung Cha: School of Electrical and Electronic Engineering, Yonsei University
Bo-Gyu Jang: Pohang University of Science and Technology (POSTECH)
Joo-Youn Kim: School of Electrical and Electronic Engineering, Yonsei University
Gangtae Jin: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS)
Donghun Lee: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS)
Ji-Hoon Ahn: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS)
Myoung-Jae Lee: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS)
Ji Hoon Shim: Pohang University of Science and Technology (POSTECH)
Hyunyong Choi: School of Electrical and Electronic Engineering, Yonsei University
Moon-Ho Jo: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS)

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Two-dimensional stacks of dissimilar hexagonal monolayers exhibit unusual electronic, photonic and photovoltaic responses that arise from substantial interlayer excitations. Interband excitation phenomena in individual hexagonal monolayer occur in states at band edges (valleys) in the hexagonal momentum space; therefore, low-energy interlayer excitation in the hexagonal monolayer stacks can be directed by the two-dimensional rotational degree of each monolayer crystal. However, this rotation-dependent excitation is largely unknown, due to lack in control over the relative monolayer rotations, thereby leading to momentum-mismatched interlayer excitations. Here, we report that light absorption and emission in MoS2/WS2 monolayer stacks can be tunable from indirect- to direct-gap transitions in both spectral and dynamic characteristics, when the constituent monolayer crystals are coherently stacked without in-plane rotation misfit. Our study suggests that the interlayer rotational attributes determine tunable interlayer excitation as a new set of basis for investigating optical phenomena in a two-dimensional hexagonal monolayer system.

Date: 2015
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DOI: 10.1038/ncomms8372

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