Magnon bound states vs. anyonic Majorana excitations in the Kitaev honeycomb magnet α\alpha-RuCl3_3

The pure Kitaev honeycomb model harbors a quantum spin liquid in zero magnetic fields, while applying finite magnetic fields induces a topological spin liquid with non-Abelian anyonic excitations. This latter phase has been much sought after in Kitaev candidate materials, such as $\alpha$-RuCl$_3$. Currently, two competing scenarios exist for the intermediate field phase of this compound ($B=7-10$ T), based on experimental as well as theoretical results: (i) conventional multiparticle magnetic excitations of integer quantum number vs. (ii) Majorana fermionic excitations of possibly non-Abelian nature with a fractional quantum number. To discriminate between these scenarios a detailed investigation of excitations over a wide field-temperature phase diagram is essential. Here we present Raman spectroscopic data revealing low-energy quasiparticles emerging out of a continuum of fractionalized excitations at intermediate fields, which are contrasted by conventional spin-wave excitations. The temperature evolution of these quasiparticles suggests the formation of bound states out of fractionalized excitations

One-ninth magnetization plateau stabilized by spin entanglement in a kagome antiferromagnet

The spin-1/2 antiferromagnetic Heisenberg model on a Kagome lattice is geometrically frustrated, which is expected to promote the formation of many-body quantum entangled states. The most sought-after among these is the quantum spin liquid phase, but magnetic analogs of liquid, solid, and supersolid phases may also occur, producing fractional plateaus in the magnetization. Here, we investigate the experimental realization of these predicted phases in the Kagome material YCu3(OD)6+xBr3-x (x=0.5). By combining thermodynamic and Raman spectroscopic techniques, we provide evidence for fractionalized spinon excitations and observe the emergence of a 1/9 magnetization plateau. These observations establish YCu3(OD)6+xBr3-x as a model material for exploring the 1/9 plateau phase.Comment: to appear in Nature Physics, 33 pagses, 15 figure

A study on the effect of pre-cue in simple reactions of control-on-display interface

Objective: This study focuses on the effects of pre-cues informing the location of upcoming visual stimulus on finger movement response in the context of control-on-display interfaces. Background: Previous research on pre-cues focus on attention allocation and motion studies were limited to indirect control conditions. The design of this study aimed to collect data on the exact landing point for finger-tap responses to a given visual stimulus. Method: Controlled visual stimuli and tasks were presented on a UI evaluation system built using mobile web standards; response accuracy and response time were measured and collected as appropriate. Among the 16 recruited participants, 11 completed the experiment. Results: Providing pre-cue on the location of stimulus affected response time and response accuracy. The response bias, which is a distance from the center of stimulus to the finger-tap location, was larger when the pre-cue was given during a one-handed operation. Conclusion: Given a pre-cue, response time decreases, but with accuracy penalized. Application: In designing touch-screen UI's - more strictly, visual components also acting as controllers - designers would do well to balance human perceptual and cognitive characteristics strategically. A Study on the Effect of Pre-cue in Simple Reactions on Control-on-Display Interfaces (PDF Download Available). Available from: http://www.researchgate.net/publication/264107791_A_Study_on_the_Effect_of_Pre-cue_in_Simple_Reactions_on_Control-on-Display_Interfaces [accessed Oct 2, 2015].clos

A 3.1-4.8-GHz IR- UWB All- Digital Pulse Generator With Variable Channel Selection in 0.13-mu m CMOS Technology

An all-digital pulse generator in a standard 0.13-mu m CMOS technology for communication systems using an impulse radio ultrawideband signal is presented. A delay-line-based architecture utilizing only static logic gates for pulse generation with low-power characteristic is proposed in this brief. The center frequency and the fixed bandwidth of 500 MHz of the output signal can be digitally controlled to cover three channels in the low band of UWB spectrum. Delay-based binary phase shift keying and pulse position modulation schemes are exploited at the same time to modulate transmitted signals with further improvement in spectrum characteristics. The total energy consumption is 48 pJ/pulse at 1.2-V supply voltage without static bias currents.close2

An Adaptive Technique to Improve Wireless Power Transfer for Consumer Electronics

This paper presents an adaptive technique to improve an efficiency of wireless power transfer system for future portable consumer electronics. By changing a coupling coefficient between coils only in the transmitting side, the system performance increases significantly

In Situ Neutron Diffraction Study of Phase Transformation of High Mn Steel with Different Carbon Content

In situ neutron diffraction was employed to examine the phase transformation behavior of high-Mn steels with different carbon contents (0.1, 0.3, and 0.5 wt.%C). With increasing carbon contents from 0.1 C to 0.5 C, the austenite phase fraction among the constituent phases increased from ~66% to ~98%, and stacking fault energy (SFE) increased from ~0.65 to ~16.5 mJ/m2. The 0.1 C and 0.3 C steels underwent phase transformation from γ-austenite to ε-martensite or α’-martensite during tensile deformation. On the other hand, the 0.5 C steel underwent phase transformation only from γ-austenite to ε-martensite. The 0.3 C steel exhibited a low yield strength, a high strain hardening rate, and the smallest elongation. The high strain hardening of the 0.3 C alloy was due to a rapid phase transformation rate from γ-austenite to ε-martensite. The austenite of 0.5 C steel was strengthened by mechanical twinning during loading process, and the twinning-induced plasticity (TWIP) effect resulted in a large ductility. The 0.5 wt.% carbon addition stabilized the austenite phase by delaying the onset of the ε-martensite phase transformation

An Adaptive Technique to Improve Wireless Power Transfer for Consumer Electronics

This paper presents an adaptive technique to enhance the efficiency of magnetic resonance based wireless power transfer system for future portable consumer electronics. In order to transfer energy to mobile devices, asymmetric coupling resonators with larger sizes of coils in a transmitter than those in a receiver are exploited. By changing a coupling coefficient between coils only in the transmitting side, the system performance increases significantly. An experiment setup has been developed, and the S-21 parameter has been measured showing 3.3 dB improvement of system using the adaptive technique at a distance of 65 cm. An important finding is that the technique is also effective in case of multiple receiving coils. The measured performance was improved by roughly 1 dB with the use of the adaptive technique.close4

Coexistence of random singlets and disordered Kitaev spin liquid in H3LiIr2O6

©2023 American Physical Society. We combine static magnetic susceptibility chi(T), muon-spin relaxation, and H-1 nuclear magnetic resonance measurements to explore the spin dynamics in the disordered-induced quantum spin liquid candidate H3LiIr2O6. Inverse Laplace transform analysis of the H-1 spin-lattice relaxation rate 1/T-1 enables us to identify two characteristic temperatures Tg = 110 K and T* = 26 K. Below T-g, a slower 1/T-1(slow) component dictated by gapped excitations with a spin gap Delta(h) = 30-38 K evolves distinctly from a faster 1/T-1(fast) component pertaining to gapless excitations. Furthermore, we observe a sub-Curie divergent chi(T) proportional to T-0.68, a power-law dependent 1/T fast 1 proportional to T 1.4, and a weakly activated 1/(slow)(T) 1 proportional to exp(-Delta(l)/k(B)T) (Delta(l) = 3-6 K) below T* = 26 K. All these features suggest the coexistence of a disordered spin-liquid state and spin singlets with spatially distributed gaps.11Nsciescopu

Needle Entry Angle to Prevent Carotid Sheath Injury for Fluoroscopy-Guided Cervical Transforaminal Epidural Steroid Injection

Objective To suggest rotation angles of fluoroscopy that can bypass the carotid sheath according to vertebral levels for cervical transforaminal epidural steroid injection (TFESI). Methods Patients who underwent cervical spine magnetic resonance imaging (MRI) from January 2009 to October 2017 were analyzed. In axial sections of cervical spine MRI, three angles to the vertical line (α, angle not to insult carotid sheath; β, angle for the conventional TFESI; γ, angle not to penetrate carotid artery) were measured. Results Alpha (α) angles tended to increase for upper cervical levels (53.3° in C6-7, 65.2° in C5-6, 75.3° in C4-5, 82.3° in C3-4). Beta (β) angles for conventional TFESI showed a constant value of 45° to 47° (47.5° in C6-7, 47.4° in C5-6, 45.7° in C4-5, 45.0° in C3-4). Gamma (γ) angles increased at higher cervical levels as did α angles (25.2° in C6-7, 33.6° in C5-6, 43.0° in C4-5, 56.2° in C3-4). Conclusion The risk of causing injury by penetrating major vessels in the carotid sheath tends to increase at upper cervical levels. Therefore, prior to cervical TFESI, measuring the angle is necessary to avoid carotid vessels in the axial section of CT or MRI, thus contributing to a safer procedure

Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu2(BO3)(2)

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