Publications by Dumitru Dumcenco

Persistence of Magnetism in Atomically Thin MnPS3 Crystals

Marco Gibertini, Dumitru Dumcenco, Zhe Wang

The magnetic state of atomically thin semiconducting layered antiferromagnets such as CrI3 and CrCI3 can be probed by forming tunnel barriers and measuring their resistance as a function of magnetic field (H) and temperature (T). This is possible because t ...

AMER CHEMICAL SOC2020

Strongly Coupled Coherent Phonons in Single-Layer MoS2

Andras Kis, Dumitru Dumcenco

We present a transient absorption setup combining broadband detection over the visible-UV range with high temporal resolution (similar to 20 fs) which is ideally suited to trigger and detect vibrational coherences in different classes of materials. We gene ...

AMER CHEMICAL SOC2020

Self-sensing, tunable monolayer MoS2 nanoelectromechanical resonators

Andras Kis, Sajedeh Manzeli, Dumitru Dumcenco, Guilherme Migliato Marega

Excellent mechanical properties and the presence of piezoresistivity make single layers of transition metal dichalcogenides (TMDCs) viable candidates for integration in nanoelectromechanical systems (NEMS). We report on the realization of electromechanical ...

Nature Research2019

Determining the phase diagram of atomically thin layered antiferromagnet CrCl3

Marco Gibertini, Dumitru Dumcenco, Zhe Wang

Changes in the spin configuration of atomically thin, magnetic van der Waals multilayers can cause drastic modifications in their opto-electronic properties. Conversely, the opto-electronic response of these systems provides information about the magnetic ...

Nature Publishing Group2019

Excitonic Effects in Single Layer MoS2 Probed by Broadband Two-dimensional Electronic Spectroscopy

Andras Kis, Dumitru Dumcenco

We exploit two-dimensional electron spectroscopy to coherently excite the A and B excitons in monolayer MoS2. Combined with simulations, our data distinguish ultrafast bright excitons decoherence and sub-ps scattering decays to dark excitons. (c) 2019 The ...

IEEE2019

Quantitative Nanoscale Absorption Mapping: A Novel Technique To Probe Optical Absorption of Two-Dimensional Materials

Andras Kis, Anna Fontcuberta i Morral, Dumitru Dumcenco, Luca Francaviglia, Marco Negri

Two-dimensional semiconductors, in particular transition metal dichalcogenides and related heterostructures, have gained increasing interest as they constitute potential new building blocks for the next generation of electronic and optoelectronic applicati ...

American Chemical Society (ACS)2019

Impact of photodoping on inter- and intralayer exciton emission in a MoS2/MoSe2/MoS2 heterostructure

Andras Kis, Alessandro Surrente, Dumitru Dumcenco, Yen-Cheng Kung

AIP American Institute of Physics2018

Intervalley Scattering of Interlayer Excitons in a MoS2/MoSe2/MoS2 Heterostructure in High Magnetic Field

Andras Kis, Alessandro Surrente, Dumitru Dumcenco, Yen-Cheng Kung

American Chemical Society (ACS)2018

Air and Water-Stable n-Type Doping and Encapsulation of Flexible MoS2 Devices with SU8

Andras Kis, Georg Fantner, Nahid Hosseini, Dumitru Dumcenco, Yen-Cheng Kung

2018

Geometrical Effect in 2D Nanopores

Andras Kis, Aleksandra Radenovic, Duncan Thomas Lindsay Alexander, Davide Deiana, Ke Liu, Dumitru Dumcenco, Martina Lihter, Vasiliki Tileli, Aditya Sarathy

A long-standing problem in the application of solid-state nanopores is the lack of the precise control over the geometry of artificially formed pores compared to the well-defined geometry in their biological counterpart, that is, protein nanopores. To date ...

American Chemical Society (ACS)2017

Field-induced charge separation dynamics in monolayer MoS2

Andras Kis, Dragan Mihailovic, Dmitry Ovchinnikov, Dumitru Dumcenco, Yen-Cheng Kung, Daniele Vella

The absorption spectra of 2D semiconductors are dominated by excitons with binding energy of several hundreds of meV. Nevertheless, even single layers show an appreciable photovoltaic effect and work as the active material in high sensitivity photodetector ...

Iop Publishing Ltd2017

Evolution of the Valley Position in Bulk Transition-Metal Chalcogenides and Their Monolayer Limit

Gang Xu, Dumitru Dumcenco, Zahid Hussain, Yi Zhang, Kai Yan, Bo Zhou

Layered transition metal chalcogenides with large spin orbit coupling have recently sparked much interest due to their potential applications for electronic, optoelectronic, spintronics, and valleytronics. However, most current understanding of the electro ...

American Chemical Society2016

Free-standing electronic character of monolayer

Olivier Renault, Andras Kis, Ming-Wei Chen, Dumitru Dumcenco, Yen-Cheng Kung, Hokwon Kim

We have evaluated as-grown MoS2 crystals, epitaxially grown on a monocrystalline sapphire by chemical vapor deposition (CVD), with direct electronic band-structure measurements by energy-filtered k-space photoelectron emission microscopy performed with a c ...

Amer Physical Soc2016

Disorder engineering and conductivity dome in ReS2 with electrolyte gating

Andras Kis, Oleg Yazyev, Diego José Pasquier, Fernando Gargiulo, Dmitry Ovchinnikov, Adrien Victor Allain, Dumitru Dumcenco

Atomically thin rhenium disulphide (ReS2) is a member of the transition metal dichalcogenide family of materials. This two-dimensional semiconductor is characterized by weak interlayer coupling and a distorted 1T structure, which leads to anisotropy in ele ...

Nature Publishing Group2016

Single-layer MoS2 nanopores as nanopower generators

Andras Kis, Aleksandra Radenovic, Michael Graf, Dmitry Ovchinnikov, Jiandong Feng, Ke Liu, Dumitru Dumcenco

Making use of the osmotic pressure difference between fresh water and seawater is an attractive, renewable and clean way to generate power and is known as 'blue energy'(1-3). Another electrokinetic phenomenon, called the streaming potential, occurs when an ...

Nature Publishing Group2016

High-quality Synthetic 2D Transition Metal Dichalcogenide Semiconductors

Andras Kis, Dmitry Ovchinnikov, Dumitru Dumcenco, Kolyo Marinov

We give here an overview on our results on the large-area growth of 2D transition metal dichalcogenide semiconductors MoS2, MoSe2, WSe2 using chemical vapor deposition. The growth of MoS2 on sapphire occurs epitaxially with the crystalline orientation of t ...

Ieee2016

Electrochemical Reaction in Single Layer MoS2: nanopores opened atom by atom

Andras Kis, Aleksandra Radenovic, Michael Graf, Duncan Thomas Lindsay Alexander, Daria Krasnozhon, Roman Bulushev, Jiandong Feng, Ke Liu, Dumitru Dumcenco, Martina Lihter

Ultrathin nanopore membranes based on 2D materials have demonstrated ultimate resolution toward DNA sequencing. Among them, molybdenum disulfide (MoS2) shows long-term stability as well as superior sensitivity enabling high throughput performance. The trad ...

American Chemical Society (ACS)2015

Large-Area Epitaxial Monolayer MoS2

Andras Kis, Aleksandra Radenovic, Anna Fontcuberta i Morral, Philippe Gillet, Nicola Marzari, Simone Bertolazzi, Oriol López Sánchez, Daria Krasnozhon, Ming-Wei Chen, Dmitry Ovchinnikov, Marco Gibertini, Dumitru Dumcenco, Yen-Cheng Kung, Kolyo Marinov

Two-dimensional semiconductors such as MoS2 are an emerging material family with wide-ranging potential applications in electronics, optoelectronics, and energy harvesting. Large-area growth methods are needed to open the way to applications. Control over ...

Amer Chemical Soc2015

Identification of single nucleotides in MoS2 nanopores

Andras Kis, Aleksandra Radenovic, Roman Bulushev, Sergey Khlybov, Jiandong Feng, Ke Liu, Dumitru Dumcenco

The size of the sensing region in solid-state nanopores is determined by the size of the pore and the thickness of the pore membrane, so ultrathin membranes such as graphene and single-layer molybdenum disulphide could potentially offer the necessary spati ...

Nature Publishing Group2015

Large-area MoS2 grown using H2S as the sulphur source

Andras Kis, Aleksandra Radenovic, Duncan Thomas Lindsay Alexander, Philippe Gillet, Oriol López Sánchez, Dmitry Ovchinnikov, Dumitru Dumcenco

We report on the growth of molybdenum disulphide (MoS2) using H2S as a gas-phase sulfur precursor that allows controlling the domain growth direction of domains in both vertical (perpendicular to the substrate plane) and horizontal (within the substrate pl ...

2015