Abstract Functionalities of two-dimensional (2D) crystals based on semiconducting transition metal dichalcogenides (TMDs) have now stemmed from simple field effect transistors (FETs) to a variety electronic and opto-valleytronic devices even superconductivity. Among them, superconductivity is the least studied property in TMDs due methodological difficulty accessing it different TMD species. Here, we report systematic study MoSe 2 , MoTe WS by ionic gating regimes. Electrostatic using liquid...

Scaling down materials to an atomic-layer level produces rich physical and chemical properties as exemplified in various two-dimensional (2D) crystals including graphene, transition metal dichalcogenides, black phosphorus. This is caused by the dramatic modification of electronic band structures. In such reduced dimensions, electron correlation effects are also expected be significantly changed from bulk systems. However, there few attempts realize novel phenomena correlated 2D crystals. We...

Abstract Chirality of materials are known to affect optical, magnetic and electric properties, causing a variety nontrivial phenomena such as circular dichiroism for chiral molecules, Skyrmions in magnets nonreciprocal carrier transport conductors. On the other hand, effect chirality on superconducting has not been known. Here we report nonreciprocity superconductivity—unambiguous evidence superconductivity reflecting structure which forward backward supercurrent flows equivalent because...

Abstract If a material with an odd number of electrons per unit-cell is insulating, Mott localisation may be invoked as explanation. This widely accepted for the layered compound 1 T -TaS 2 , which has low-temperature insulating phase comprising charge order clusters 13 unpaired orbitals each. But if stacking layers doubles to include even orbitals, nature state ambiguous. Here, scanning tunnelling microscopy reveals two distinct terminations in sign such double-layer pattern. However,...

Promoter function for gene expression of the long terminal repeat (LTR) human T-cell leukemia virus type I (HTLV-I) was studied by constructing plasmids containing LTR sequence. The encoding chloramphenicol acetyltransferase (CATase) linked to an HTLV-I sequence (pLTR-CAT) replacing simian 40 promoter in plasmid pSV2-CAT with transient CATase activities cells transfected were compared. results are summarized as follows: HTLV active even epithelial cell line, efficiency similar that promoter....

Two-dimensional crystals, especially graphene and transition metal dichalcogenides (TMDs), are attracting growing interests because they provide an ideal platform for novel unconventional electronic band structures derived by thinning. The thinning may also affect collective phenomena of electrons in interacting electron systems can lead to exotic states beyond the simple picture. Here, we report systematic control charge-density-wave (CDW) transitions changing thickness, cooling rate gate...

We report an electric field tuning of the thermopower in ultrathin WSe2 single crystals over a wide range carrier concentration by using double-layer (EDL) technique. succeeded optimization power factor not only hole but also electron side, which has never been chemically accessed. The maximized values are one-order larger than that obtained changing chemical composition, reflecting clean nature electrostatic doping.

Luminescence properties of carbon nanotubes are strongly affected by exciton diffusion, which plays an important role in various nonradiative decay processes. Here we perform photoluminescence microscopy on hundreds individual air-suspended to elucidate the interplay between end quenching, and exciton-exciton annihilation A model derived from random-walk theory as well Monte Carlo simulations utilized analyze nanotube length dependence excitation power emission intensity. We have obtained...

Simultaneous photoluminescence and photocurrent measurements on individual single-walled carbon nanotubes reveal spontaneous dissociation of excitons into free electron-hole pairs. Correlation luminescence intensity shows that a significant fraction are dissociating during their relaxation the lowest exciton state. Furthermore, combination optical electrical signals also allows for extraction absorption cross section oscillator strength. Our observations explain reasons photoconductivity in...

2D crystals based on transition metal dichalcogenides (TMDs) provide a unique platform of novel physical properties and functionalities, including photoluminescence, laser, valleytronics, spintronics, piezoelectric devices, field effect transistors (FETs), superconductivity. Among them, FET devices are extremely useful because voltage-tunable carrier density Fermi energy. In particular, high charge accumulation in electric double layer transistor (EDLT), which is device driven by ionic...

Two-dimensional (2D) materials exhibit unusual physical and chemical properties that are attributed to the thinning-induced modification of their electronic band structure. Recently, reduced thickness was found dramatically impact not only static structure, but also dynamic ordering kinetics. The kinetics first-order phase transitions becomes significantly slowed with decreasing thickness, metastable supercooled states can be realized by thinning alone. We therefore focus on layered iridium...

This paper reports on a photophysics study of gate-doped single-wall carbon nanotubes suspended over trenches. The authors experimentally demonstrate trion emissions from electrostatically doped nanotubes. They observe that the binding energies can be manipulated by varying nanotube diameter.

We report that a high electric field and current triggers the switching of multiple states in two-dimensional (2D) crystals $1T\text{\ensuremath{-}}\mathrm{Ta}{\mathrm{S}}_{2}$, accompanying metamorphosis electronic structure. fabricated four-terminal devices nanometer-thick $1T\text{\ensuremath{-}}\mathrm{Ta}{\mathrm{S}}_{2}$ with charge-density-wave (CDW) phases. By applying in-plane fields concomitantly injecting currents, we realized nonvolatile among normal metals, Mott insulators,...

We report modulation of the superconducting critical temperature (Tc) ultrathin niobium diselenide (NbSe2) single crystals by gating an electric double-layer transistor. realized reversible and irreversible changes Tc adjusting operating range voltage. The responses correspond to electrostatic carrier doping electrochemical etching crystal, respectively. results suggest that provides opportunities control functionalize collective electronic phenomena in two-dimensional crystals.

Electrolyte gating on correlated VO 2 thin films enables electrical control of the “bulk” electronic and structural phases over electrostatic screening length. Although this unique functionality potentially provides novel optoelectronic device applications, there are intense discussions mechanism operation both from electrochemical viewpoints. Here it is shown that reversibility strongly depends substrates, suggesting a governing might differ depending substrates. grown lattice‐matched TiO...

Transition metal dichalcogenide nanotubes are fascinating platforms for the research of superconductivity due to their unique dimensionalities and geometries. Here we report diameter dependence in individual WS2 nanotubes. The is realized by electrochemical doping via ionic gating technique which nanotube estimated from periodic oscillating magnetoresistance, known as Little-Parks effect. critical temperature displays an unexpected linear behavior a function inverse diameter, that is,...

When controlling electronic properties of bulk materials, we usually assume that the basic crystal structure is fixed. However, in two-dimensional (2D) atomic or polymorph attracting growing interest as a parameter to functionalize their properties. Various polymorphs can exist transition metal dichalcogenides (TMDCs) from which 2D materials are generated, and polymorphism has drastic impacts on states. Here report discovery an unprecedented TMDC material. By mechanical exfoliation, made...

Electron-phonon-driven charge density waves can in some circumstances allow electronic correlations to become predominant, driving a system into Mott insulating state. New insights both the state and preceding wave may result from observations of coupled dynamics their underlying degrees freedom. Here, tunneling injection single electrons upper Hubbard band charge-density-wave material 1T-TaS2 reveals extraordinarily narrow excitations which couple amplitude mode phonons associated with...

Several thermal solidification processes have been developed mainly in Japan. They are lightweight aggregates, brick, interlocking tile, char, and slag. A full-scale plant of them has successfully operated for more than 10 years. The quality the end products is better traditional ones. all substitutive to existing Japanese experience proves that technically feasible, but not economically. Their manufacturing cost always higher market price. In addition, they consume large amounts energy....

Optical activity---the ability to rotate the polarization of light---was long thought be only property organic molecules without intrinsic structural mirror symmetry. Scientists now demonstrate experimentally that single carbon nanotubes, which have internal symmetry, can externally induced exhibit both giant optical activity and a broad range variability.