scholarly journals Electrical control of interlayer exciton dynamics in atomically thin heterostructures

Science ◽  
2019 ◽  
Vol 366 (6467) ◽  
pp. 870-875 ◽  
Author(s):  
Luis A. Jauregui ◽  
Andrew Y. Joe ◽  
Kateryna Pistunova ◽  
Dominik S. Wild ◽  
Alexander A. High ◽  
...  
Keyword(s):  
Ohmic Contacts ◽  
Transition Metal Dichalcogenides ◽  
Excitation Power ◽  
Drift Motion ◽  
Gate Electrodes ◽  
Large Binding Energy ◽  
Metal Dichalcogenides ◽  
Long Lifetime ◽  
Electrical Generation ◽  
And Control

A van der Waals heterostructure built from atomically thin semiconducting transition metal dichalcogenides (TMDs) enables the formation of excitons from electrons and holes in distinct layers, producing interlayer excitons with large binding energy and a long lifetime. By employing heterostructures of monolayer TMDs, we realize optical and electrical generation of long-lived neutral and charged interlayer excitons. We demonstrate that neutral interlayer excitons can propagate across the entire sample and that their propagation can be controlled by excitation power and gate electrodes. We also use devices with ohmic contacts to facilitate the drift motion of charged interlayer excitons. The electrical generation and control of excitons provide a route for achieving quantum manipulation of bosonic composite particles with complete electrical tunability.

scholarly journals Electrically controllable router of interlayer excitons

2020 ◽  
Vol 6 (41) ◽  
pp. eaba1830
Author(s):  
Yuanda Liu ◽  
Kévin Dini ◽  
Qinghai Tan ◽  
Timothy Liew ◽  
Kostya S. Novoselov ◽  
...  
Keyword(s):  
Transverse Electric ◽  
Transition Metal Dichalcogenides ◽  
Optoelectronic Devices ◽  
Optical Signals ◽  
Indirect Excitons ◽  
Telecommunication Technology ◽  
Metal Dichalcogenides ◽  
Long Lifetime ◽  
Efficient Coupling ◽  
Strong Dipole

Optoelectronic devices that allow rerouting, modulation, and detection of the optical signals would be extremely beneficial for telecommunication technology. One of the most promising platforms for these devices is excitonic devices, as they offer very efficient coupling to light. Of especial importance are those based on indirect excitons because of their long lifetime. Here, we demonstrate excitonic transistor and router based on bilayer WSe2. Because of their strong dipole moment, excitons in bilayer WSe2 can be controlled by transverse electric field. At the same time, unlike indirect excitons in artificially stacked heterostructures based on transition metal dichalcogenides, naturally stacked bilayers are much simpler in fabrication.

A new insight for ohmic contacts to MoS2: by tuning MoS2 affinity energies but not metal work-functions

2017 ◽  
Vol 19 (38) ◽  
pp. 26151-26157 ◽  
Author(s):  
Qian Wang ◽  
Bei Deng ◽  
Xingqiang Shi
Keyword(s):  
Transition Metal ◽  
Ohmic Contacts ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
Work Functions ◽  
Metal Work

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have recently attracted tremendous interest for fundamental studies and applications.

scholarly journals Symmetry and control of spin-scattering processes in two-dimensional transition metal dichalcogenides

2021 ◽  
Vol 103 (11) ◽  
Author(s):  
Carmem M. Gilardoni ◽  
Freddie Hendriks ◽  
Caspar H. van der Wal ◽  
Marcos H. D. Guimarães
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
Spin Scattering ◽  
And Control

Probing biexciton in monolayer WS2 through controlled many-body interaction

2D Materials ◽  
2021 ◽  
Author(s):  
Suman Chatterjee ◽  
Sarthak Das ◽  
Garima Gupta ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Radiative Recombination ◽  
Transition Metal Dichalcogenides ◽  
Excitation Power ◽  
Equation Model ◽  
Final States ◽  
Many Body ◽  
Time Resolved ◽  
Spectral Separation ◽  
Metal Dichalcogenides ◽  
Time Resolved Photoluminescence

Abstract The monolayers of semiconducting transition metal dichalcogenides host strongly bound excitonic complexes and are an excellent platform for exploring many-body physics. Here we demonstrate a controlled kinetic manipulation of the five-particle excitonic complex, the charged biexciton, through a systematic dependence of the biexciton peak on excitation power, gate voltage, and temperature using steady-state and time-resolved photoluminescence (PL). With the help of a combination of the experimental data and a rate equation model, we argue that the binding energy of the charged biexciton is less than the spectral separation of its peak from the neutral exciton. We also note that while the momentum-direct radiative recombination of the neutral exciton is restricted within the light cone, such restriction is relaxed for a charged biexciton recombination due to the presence of near-parallel excited and final states in the momentum space.

Achieving Low Resistance Ohmic Contacts to Transition Metal Dichalcogenides (TMDCs)

IRC-SET 2020 ◽  
2021 ◽  
pp. 185-196
Author(s):  
Anirudh Gajula ◽  
Wes Wen Jun Lee ◽  
Calvin Pei Yu Wong ◽  
Kuan Eng Johnson Goh
Keyword(s):  
Transition Metal ◽  
Ohmic Contacts ◽  
Transition Metal Dichalcogenides ◽  
Low Resistance ◽  
Metal Dichalcogenides

scholarly journals Strong interaction between interlayer excitons and correlated electrons in WSe2/WS2 moiré superlattice

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shengnan Miao ◽  
Tianmeng Wang ◽  
Xiong Huang ◽  
Dongxue Chen ◽  
Zhen Lian ◽  
...  
Keyword(s):  
Transition Metal Dichalcogenides ◽  
Strongly Correlated Electrons ◽  
Optical Excitation ◽  
Excitation Power ◽  
Band Alignment ◽  
Electron Interaction ◽  
Correlated Electrons ◽  
Strong Electron ◽  
Correlated Electron ◽  
Metal Dichalcogenides

AbstractHeterobilayers of transition metal dichalcogenides (TMDCs) can form a moiré superlattice with flat minibands, which enables strong electron interaction and leads to various fascinating correlated states. These heterobilayers also host interlayer excitons in a type-II band alignment, in which optically excited electrons and holes reside on different layers but remain bound by the Coulomb interaction. Here we explore the unique setting of interlayer excitons interacting with strongly correlated electrons, and we show that the photoluminescence (PL) of interlayer excitons sensitively signals the onset of various correlated insulating states as the band filling is varied. When the system is in one of such states, the PL of interlayer excitons is relatively amplified at increased optical excitation power due to reduced mobility, and the valley polarization of interlayer excitons is enhanced. The moiré superlattice of the TMDC heterobilayer presents an exciting platform to engineer interlayer excitons through the periodic correlated electron states.

scholarly journals MoTe2 Field-Effect Transistors with Low Contact Resistance through Phase Tuning by Laser Irradiation

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2805
Author(s):  
Geun Yeol Bae ◽  
Jinsung Kim ◽  
Junyoung Kim ◽  
Siyoung Lee ◽  
Eunho Lee
Keyword(s):  
Field Effect ◽  
High Performance ◽  
Ohmic Contacts ◽  
Field Effect Transistors ◽  
Transition Metal Dichalcogenides ◽  
Charge Carrier Mobility ◽  
Large Area ◽  
Electrical Devices ◽  
Phase Tuning ◽  
Metal Dichalcogenides

Due to their extraordinary electrical and physical properties, two-dimensional (2D) transition metal dichalcogenides (TMDs) are considered promising for use in next-generation electrical devices. However, the application of TMD-based devices is limited because of the Schottky barrier interface resulting from the absence of dangling bonds on the TMDs’ surface. Here, we introduce a facile phase-tuning approach for forming a homogenous interface between semiconducting hexagonal (2H) and semi-metallic monoclinic (1T’) molybdenum ditelluride (MoTe2). The formation of ohmic contacts increases the charge carrier mobility of MoTe2 field-effect transistor devices to 16.1 cm2 V−1s−1 with high reproducibility, while maintaining a high on/off current ratio by efficiently improving charge injection at the interface. The proposed method enables a simple fabrication process, local patterning, and large-area scaling for the creation of high-performance 2D electronic devices.

scholarly journals Transition Metal Dichalcogenides (TMDC)-Based Nanozymes for Biosensing and Therapeutic Applications

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 337
Author(s):  
Dario Presutti ◽  
Tarun Agarwal ◽  
Atefeh Zarepour ◽  
Nehar Celikkin ◽  
Sara Hooshmand ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Surface ◽  
High Surface Area ◽  
Transition Metal Dichalcogenides ◽  
Enzymatic Properties ◽  
Promising Alternative ◽  
Therapeutic Applications ◽  
Semiconducting Properties ◽  
Metal Dichalcogenides ◽  
And Control

Nanozymes, a type of nanomaterial with enzyme-like properties, are a promising alternative to natural enzymes. In particular, transition metal dichalcogenides (TMDCs, with the general formula MX2, where M represents a transition metal and X is a chalcogen element)-based nanozymes have demonstrated exceptional potential in the healthcare and diagnostic sectors. TMDCs have different enzymatic properties due to their unique nano-architecture, high surface area, and semiconducting properties with tunable band gaps. Furthermore, the compatibility of TMDCs with various chemical or physical modification strategies provide a simple and scalable way to engineer and control their enzymatic activity. Here, we discuss recent advances made with TMDC-based nanozymes for biosensing and therapeutic applications. We also discuss their synthesis strategies, various enzymatic properties, current challenges, and the outlook for future developments in this field.

scholarly journals Universal low-temperature Ohmic contacts for quantum transport in transition metal dichalcogenides

2D Materials ◽  
2016 ◽  
Vol 3 (2) ◽  
pp. 021007 ◽  
Author(s):  
Shuigang Xu ◽  
Zefei Wu ◽  
Huanhuan Lu ◽  
Yu Han ◽  
Gen Long ◽  
...  
Keyword(s):  
Low Temperature ◽  
Transition Metal ◽  
Quantum Transport ◽  
Ohmic Contacts ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides
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