Nature Search

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

Single atomic layers of transition metal dichalcogenides have outstanding electrical and optical properties. Here, the authors show that light absorption and emission from stacks of different transition metal dichalcogenide monolayers can be tuned by rotating the crystals.

Hoseok Heo
Ji Ho Sung
Moon-Ho Jo
ResearchOpen Access23 Jun 2015
Nature Communications

Volume: 6, P: 1-7
Thermoelectric materials by using two-dimensional materials with negative correlation between electrical and thermal conductivity

The improvement of the thermoelectric figure of merit ZT has been hindered by the challenges associated with the independent control of the electrical and thermal conductivity. Here the authors show that SnS₂nanosheets can lead to an increased ZT via negative correlation between electrical and thermal conductivity.

Myoung-Jae Lee
Ji-Hoon Ahn
Moon-Ho Jo
ResearchOpen Access21 Jun 2016
Nature Communications

Volume: 7, P: 1-7
Coplanar semiconductor–metal circuitry defined on few-layer MoTe₂ via polymorphic heteroepitaxy

Sequential heteroepitaxy of transition-metal dichalcogenide polymorphs with different electronic properties is used to build coplanar ultrathin circuitry with atomic-scale precision.

Ji Ho Sung
Hoseok Heo
Moon-Ho Jo
Research18 Sept 2017
Nature Nanotechnology

Volume: 12, P: 1064-1070
Broken mirror symmetry in excitonic response of reconstructed domains in twisted MoSe₂/MoSe₂ bilayers

Domain-resolved spectroscopy reveals the impact of local atomic registry and crystal symmetry on the exciton properties of individual domains in near-0°-twist-angle MoSe₂/MoSe₂.

Jiho Sung
You Zhou
Hongkun Park
Research13 Jul 2020
Nature Nanotechnology

Volume: 15, P: 750-754
Operando electron microscopy investigation of polar domain dynamics in twisted van der Waals homobilayers

Polar domains have been observed in twist-stacked van der Waals layers, but their dynamics are unexplored. Here, using operando electron microscopy, it is found that polar domains in an antiferroelectric arrangement cannot transition to a ferroelectric state due to topological protection of the domain wall network.

Kahyun Ko
Ayoung Yuk
Hyobin Yoo
Research26 Jun 2023
Nature Materials

Volume: 22, P: 992-998
1s-intraexcitonic dynamics in monolayer MoS₂ probed by ultrafast mid-infrared spectroscopy

Excitons—bound electron-hole pairs—in two-dimensional transition-metal dichalcogenides can exhibit a rich spectrum of excited states. Here, the authors use ultrafast mid-infrared spectroscopy to explore the dynamics of these so-called 1s-intraexcitonic transitions in monolayer molybdenum disulphide.

Soonyoung Cha
Ji Ho Sung
Hyunyong Choi
ResearchOpen Access25 Feb 2016
Nature Communications

Volume: 7, P: 1-7
Bilayer Wigner crystals in a transition metal dichalcogenide heterostructure

Optical signatures reveal correlated insulating Wigner crystals—electron solids—in a bilayer of a two-dimensional transition metal dichalcogenide, MoSe₂, with hexagonal boron nitride between the layers.

You Zhou
Jiho Sung
Hongkun Park
Research30 Jun 2021
Nature

Volume: 595, P: 48-52
Excitons in a reconstructed moiré potential in twisted WSe₂/WSe₂ homobilayers

Scanning electron microscopy is used to image stacking domains in few-layer graphene, as well as moiré patterns in twisted van der Waals heterostructures, allowing for the correlation of the local structure with their excitonic properties.

Trond I. Andersen
Giovanni Scuri
Mikhail D. Lukin
Research04 Jan 2021
Nature Materials

Volume: 20, P: 480-487

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