Recently the hybrid organic-inorganic trihalide perovskites have shown remarkable performance as active layers in photovoltaic and other optoelectronic devices. However, their spin characteristic properties not been fully studied, although due to relatively large spin-orbit coupling these materials may show great promise for spintronic applications. Here we demonstrate spin-polarized carrier injection into methylammonium lead bromide films from metallic ferromagnetic electrodes two...

A family of 2D coordination polymers were successfully synthesized through "bottom-up" techniques using Ni2+, Cu2+, Co2+, and hexaaminobenzene. Liquid–liquid air–liquid interfacial reactions used to realize thick (∼1–2 μm) thin (<10 nm) stacked layers nanosheet, respectively. Atomic-force microscopy scanning electron both revealed the smooth flat nature nanosheets. Selected area diffraction was elucidate hexagonal crystal structure framework. Electronic devices fabricated on samples Ni...

We report electrical transport experiments, using the phenomenon of breakdown to perform thermometry, that probe thermal properties individual multiwalled carbon nanotubes. Our results show nanotubes can readily conduct heat by ballistic phonon propagation. determine conductance quantum, ultimate limit for a single channel, and find good agreement with theoretical calculations. Moreover, our suggest mechanism thermally activated C-C bond breaking coupled stress carrying approximately 10(12)...

The Mott insulating state is a manifestation of strong electron interactions in nominally metallic systems. Using transport spectroscopy, we showed that an energy gap exists carbon nanotubes and occurs addition to the band small-band-gap nanotubes, indicating are never metallic. This has magnitude approximately 10 100 milli-electron volts nanotube radius (r) dependence 1/r, which good agreement with predictions for state. We also observed neutral excitations within gap, as predicted this Our...

We exploit the remarkable low-friction bearing capabilities of multiwalled carbon nanotubes (MWNTs) to realize nanoelectromechanical switches. Our switches consist two open-ended MWNT segments separated by a nanometer-scale gap. Switching occurs through electrostatically actuated sliding inner nanotube shells close gap, producing conducting ON state. For double-walled in particular, gate voltage can restore insulating OFF Acting as nonvolatile memory element capable several switching cycles,...

We report radio frequency (rf) electrical readout of graphene mechanical resonators. The motion is actuated and detected directly by using a vector network analyzer, employing local gate to minimize parasitic capacitance. A resist-free doubly clamped sample with resonant ~ 34 MHz, quality factor 10000 at 77 K, signal-to-background ratio over 20 dB demonstrated. In addition being two orders magnitude faster than the rf mixing method, this technique paves way for use in devices such as filters...

Spatially resolved Raman spectra of individual pristine suspended carbon nanotubes are observed under electrical heating. The G+ and G- bands show unequal temperature profiles. preferential heating is more pronounced in short (2 microm) than long (5 microm). These results understood terms the decay thermalization nonequilibrium phonons, revealing mechanism thermal transport these devices. measurements also enable a direct estimate contact resistances spatial variation conductivity.

Graphene mechanical resonators are the ultimate two-dimensional nanoelectromechanical systems (NEMS) with applications in sensing and signal processing. While initial devices have shown promising results, an ideal graphene NEMS resonator should be strain engineered, clamped at edge without trapping gas underneath, electrically integratable. In this letter, we demonstrate fabrication direct electrical measurement of circular SU-8 polymer-clamped chemical vapor deposition (CVD) drum...

The antiferromagnetic topological insulator MnBi2Te4 (MBT) exhibits an ideal platform for investigating unique and magnetic properties. While the transport characteristics of phase transitions in MBT materials have been extensively studied, understanding their mechanical properties magneto–mechanical coupling remains limited. Here, we utilize nanoelectromechanical systems to probe intrinsic magnetism thin flakes through magnetostrictive coupling. By analyzing resonance signatures, explore...

Raman spectra of individual pristine suspended single-walled carbon nanotubes are observed under high electrical bias. The LO and TO modes the G band behave differently with respect to voltage bias, indicating preferential electron−phonon coupling nonequilibrium phonon populations, which cause negative differential conductance in devices. By correlating electron resistivity optically measured population, data fit using a Landauer model determine key scattering parameters.

Three dimensional (3D) topological insulators (TIs) are an important class of materials with applications in electronics, spintronics and quantum computing. With the recent development truly bulk insulating 3D TIs, it has become possible to realize surface dominated phenomena electrical transport measurements e.g. Hall (QH) effect massless Dirac fermions states (TSS). However, more advanced devices phenomena, there is a need for platform tune TSS or modify them gap by proximity magnetic...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPipet Method of Sedimentation Analysis. Rapid Determination Distribution particle SizeV. V. Deshpande and M. S. TelangCite this: Anal. Chem. 1950, 22, 6, 840–841Publication Date (Print):June 17, 1950Publication History Published online1 May 2002Published inissue 17 June 1950https://pubs.acs.org/doi/10.1021/ac60042a033https://doi.org/10.1021/ac60042a033research-articleACS PublicationsRequest reuse permissionsArticle...

The paired top and bottom Dirac surface states, each associated with a half-integer quantum Hall (QH) effect, resultant integer QH conductance ({\nu}e2/h), are hallmarks of three-dimensional (3D) topological insulator (TI). In dual-gated system, chemical potentials the states controlled through separate gates. this work, we establish tunable capacitive coupling between bulk-insulating TI BiSbTeSe2 study effect on plateaus Landau level (LL) fan diagram via dual-gate control. We observe...

Three-dimensional (3D) semimetals have been predicted and demonstrated to a wide variety of interesting properties associated with their linear energy dispersion. In analogy two-dimensional (2D) Dirac semimetals, such as graphene, Cd3As2 has shown ultrahigh mobility large Fermi velocity hypothesized support plasmons at terahertz frequencies. this work, we experimentally demonstrate synthesis high-quality large-area thin films through thermal evaporation well the experimental realization...

Abstract Spin waves, quantized as magnons, have low energy loss and magnetic damping, which are critical for devices based on spin‐wave propagation needed information processing devices. The organic‐based magnet [V(TCNE) x ; TCNE = tetracyanoethylene; ≈ 2] has shown an extremely damping comparable to, example, yttrium iron garnet (YIG). excitation, detection, utilization of coherent non‐coherent spin waves various modes in V(TCNE) is demonstrated show that the angular momentum carried by...

Electrically conductive two‐dimensional (2D) metal–organic frameworks (MOFs) have emerged as good candidates for thermoelectric applications due to their high electrical and low thermal conductivities. This work studies the microscopic origin of properties copper benzenehexathiol (Cu‐BHT), a highly electrically 2D MOF. MOFs usually polycrystalline domains because bottom‐up synthesis, polycrystallinity makes it challenging understand intrinsic MOFs. Mesoscopic‐scale devices are fabricated...

Raman spectra and electrical conductance of individual, pristine, suspended, metallic single-walled carbon nanotubes are measured under applied gate potentials. The G- band is observed to downshift with small voltages, the minima occurring at EF = ±1/2Ephonon, contrary adiabatic predictions. A subsequent upshift in frequency higher voltages results a "W"-shaped shift profile that agrees well nonadiabatic phonon renormalization model. This behavior constitutes first experimental confirmation...

In this work, we measure the electrical conductance and temperature of individual, suspended quasi-metallic single-walled carbon nanotubes under high voltage biases using Raman spectroscopy, while varying doping conditions with an applied gate voltage. By applying a voltage, high-bias can be switched dramatically between linear (Ohmic) behavior nonlinear exhibiting negative differential (NDC). Phonon populations are observed to in thermal equilibrium Ohmic but switch nonequilibrium NDC...

Despite numerous studies on three-dimensional topological insulators (3D TIs), the controlled growth of high quality (bulk-insulating and mobility) TIs remains a challenging subject. This study investigates role methods synthesis single crystal stoichiometric BiSbTeSe2 (BSTS). Three types BSTS samples are prepared using three different methods, namely melting (MG), Bridgman (BG) two-step melting-Bridgman (MBG). Our results show that depend strongly method. Crystal structure composition...

Abstract As the thickness of a three-dimensional (3D) topological insulator (TI) becomes comparable to penetration depth surface states, quantum tunneling between surfaces turns their gapless Dirac electronic structure into gapped spectrum. Whether hybridization gap can host edge states is still an open question. Herein, we provide transport evidence 2D in regime bulk insulating 3D TI BiSbTeSe 2 . Different from its trivial phase, this state exhibits finite longitudinal conductance at ~2e /h...