"Nature" (published 20220630) One week of thesis guide

Compilation | Li Yan

Nature, 30 june 2022, volume 606 Issue 7916

"Nature" June 30, 2022, Vol. 606, Issue 7916

Physics Physics

Ordered and Tunable Majrana-Zero-Mode Lattice in Nature Strained Lifeas

Orderly and regulatable Macolana zero -model in lithium iron arsenic

Author: Meng Li, Geng Li, Lu Cao, xingtai zhou, xiancheng Wang et al.

Link:

https://www.nature.com/articleS/S41586-022-04744-8

Summary:

Here, we reported the orderly and regulatable Mariorana zero -energy model in the chemical measurement LIFEAS (lithium arsenic) of natural strain through scanning tunnel microscopy/spectrometer. We observe the double-axis charge density wave (CDW) stripes in the direction of iron-iron and arsenic-arsenic. The vortex is fixed on the CDW stripes in the direction of arsenic-arsenic to form an orderly vortex array.

We found that more than 90%of the vortex is topology, and it has the characteristics of the Mariorana zero -energy model in the center of the vortex, forming an orderly Mariorana zero -energy model. External magnetic field adjustment. It is worth noting that with the decrease of the adjacent vortex spiral spirit, the polar pyramids of the multi -terminal surface began to couple.

Our discovery provides an orderly and regulatable Mariorana zero -energy model, providing an important high -quality research platform for the achievement of topological quantum computing.

Abstract:

Here we report the formation of an ordered and tunable MZM lattice in naturally strained stoichiometric LiFeAs by scanning tunnelling microscopy/spectroscopy. We observe biaxial charge density wave (CDW) stripes along the Fe–Fe and As–As directions in the strained regions. The vortices are pinned on the CDW stripes in the As–As direction and form an ordered lattice. We detect that more than 90 percent of the vortices are topological and possess the characteristics of isolated MZMs at the vortex centre, forming an ordered MZM lattice with the density and the geometry tunable by an external magnetic field. Notably, with decreasing the spacing of neighbouring vortices, the MZMs start to couple with each other. Our findings provide a pathway towards tunable and ordered MZM lattices as a platform for future topological quantum computation.

Axial Higgs Mode Detect by Quantum Pathway Interference in RTE3

Use the interference of the quantum path to detect the axial Higgs mode in RTE3

Author: yiping Wang, Ioannis Petrides, Grant McNamara et al.

Link:

https://www.nature.com/articleS/S41586-022-04746-6-6

Summary:

Here, we used the quantum path to interfere, and a axial Higgs model was found in the charge density wave (CDW) system RTE3. In RTE3 (R = LA, GD), the electrons are analogy or different angular momentum. Therefore, the Raman scattering tensor related to the Higgist model contains symmetrical and opponent components, which are stimulated through two different but simplified channels. This leads to the constructive or destructive interference of the path of incident light and Raman scattered light polarization. The qualitative behavior of the Raman spectrum is captured by an appropriate tight restraint model (including axial Higgs model).

The objection component clarification is the direct evidence of the Higgs mold containing axial vector (that is, pseudo -angle momentum), and implies that the charging density wave is unconventional. Therefore, we provide a method that can measure collective modulus characteristics without using extreme experimental conditions.

Abstract:

Here we discover an axial Higgs mode in the CDW system RTe3 using the interference of quantum pathways. In RTe3 (R = La, Gd), the electronic ordering couples bands of equal or different angular momenta. As such, the Raman scattering tensor associated with the Higgs mode contains both symmetric and antisymmetric components, which are excited via two distinct but degenerate pathways. This leads to constructive or destructive interference of these pathways, depending on the choice of the incident and Raman-scattered light polarization. The qualitative behaviour of the Raman spectra is well captured by an appropriate tight-binding model, including an axial Higgs mode. Elucidation of the antisymmetric component is direct evidence that the Higgs mode contains an axial vector representation (that is, a pseudo-angular momentum) and hints that the CDW IS Unconvental. Thus, We Provide a Means For Measuring Quantum Properties of Collective Modes with Resorting to Extreme EXPERIMENTAL CONDIT ions.

FAULT-TOLERANT Operation of a Logical Qubit in a Diamond Quantum Processor

Diamond quantum processor in the logical quantum quantum bit fault tolerance operation

Author: M. H. Abobeih, Y. Wang, J. Randall, S. J. H. Loenen et al.

Link:

https://www.nature.com/articleS/S41586-022-04819-6

Summary:

Here, we use the spinning quantum bits in the diamond quantum processor to demonstrate the fault tolerance operation on the logic quantum. Our method is based on 5 quantum bits and a newly discovered protocol that can use 7 quantum bits to achieve fault tolerance.

We use a new protocol based on duplicate multi -quantum -bit measurement to encode the logic quantum position and indicate that it is better than non -lyric coding schemes. Then, we use a complete set of single quantum CLIFFORD doors to perform fault tolerance of logic quantum bits.

Finally, we demonstrated the real -time processing of the measurement of the marker stabilizer. This type of measurement is the basis of fault -tolerant quantum error correction. Although the improvement in the future and quantity of quantum ratios in the future will need to inhibit logical error rates below the physical error rate, we implement the fault tolerance protocol at the logical quantum level. One key step. Abstract:

Here, we demonstrate fault-tolerant operations on a logical qubit using spin qubits in diamond. Our approach is based on the five-qubit code with a recently discovered flag protocol that enables fault tolerance using a total of seven qubits. We encode the logical qubit using a new protocol based on repeated multi-qubit measurements and show that it outperforms non-fault-tolerant encoding schemes. We then fault-tolerantly manipulate the logical qubit through a complete set of single-qubit Clifford gates. Finally, we demonstrate flagged stabilizer measurements with real-time processing of the outcomes. Such measurements are a primitive for fault-tolerant quantum error correction. Although future improvements in fidelity and the number of qubits will be required to suppress logical error rates below the physical error rates, our realization of FAULT-TOLERANT Protocols on the Logical-Qubit Level is a Key Step Towards Quantum Information Processing Based on Solid-State spins.

Material Science Material Science

Chirral Molecular International

Hand -like molecular plug -in super crystal material

Author: qi qian, huaying ren, jingyuan zhou, zhong wan, jingxuan zhou et al.

Link:

https://www.nature.com/articleS/S41586-022-04846-3

Summary:

Here, we report a new type of hand -molecular plug -in super crystal material (CMIS), which can explore hand -induced spinning selection (CISS) as a powerful solid -state handle material platform. CMIS is prepared by inserting a two-dimensional layered crystal (such as TAS2 and TIS2) and selected handive molecules (such as R-α-Methylbenzylamine and S-α-Methylbenzylamine).

X -ray diffraction and transmission electron microscope studies have shown that the super crystal structure has a transformer crystal atomic layer and a self -assembly hand -to -hand molecular layer. Round dual -color studies have obvious hand -reliance signals between right -handed and left -handed CMIS.

In addition, through the use of CMIS as a spin filter layer, we have built a clear -handed spin tunnel -through electronic device with obvious hand -dependent dependencies, achieving more than 300%spin magnetic resistance ratio and more than 60%of the spin polarization. Rate.

Abstract:

Here we report a new class of chiral molecular intercalation superlattices (CMIS) as a robust solid-state chiral material platform for exploring CISS. The CMIS were prepared by intercalating layered two-dimensional atomic crystals (2DACs) (such as TaS2and TiS2) with selected chiral molecules (such as R-α-methylbenzylamine and S-α-methylbenzylamine). The X-ray diffraction and transmission electron microscopy studies demonstrate highly ordered superlattice structures with alternating crystalline atomic layers and self-assembled chiral molecular layers. Circular dichroism studies show clear chirality-dependent signals between right-handed (R-) and left-handed (S-) CMIS. Furthermore, by using the resulting CMIS as the spin-filtering layer, we create spin-selective tunnelling junctions with a distinct chirality-dependent Tunnelling Currenry, Achieving A Tunnelling MagnetoreSistance Ratio of more than 300 Per Center and a spin polarization ratio of more than per Centerine Ceramic aerogels for thermal insulation at exce

Dimension ceramic gas gel that can be used for insulation under extreme conditions

Author: jingran guo, shubin fu, yuanpeng deng, xiang xu et al.

Link:

https://www.nature.com/articleS/S41586-022-04784-0

Summary:

Here, we report a jagged structure of the metal crystal glory nano -fiber gas gel, which has abnormal thermal mechanical stability and ultra -low thermal conductivity at high temperature.

The gas gel has a pine ratio (3.3 × 10−4) and a thermal expansion coefficient (1.2 × 10−7 /° C) close to zero, which ensures excellent structural flexibility and thermal mechanical properties. Under the severe thermal impact and high working temperature (up to 1300 degrees Celsius), they showed extremely low intensity degeneration (below 1%) and extremely high thermal stability.

By wrapping the residual carbon substances in Yakin vermiculite fiber, we greatly reduce thermal radiation heat transfer and achieve one of the lowest high temperature conductivity coefficients in ceramic gas gel so far. -1 K -1. The combination of thermal machinery and thermal insulation performance provides an attractive material system for strong heat insulation under extreme conditions.

Abstract:

Here we report a multiscale design of hypocrystalline zircon nanofibrous aerogels with a zig-zag architecture that leads to exceptional thermomechanical stability and ultralow thermal conductivity at high temperatures. The aerogels show a near-zero Poisson's ratio (3.3 × 10−4) and a near -zero thermal expansion coefficient (1.2 × 10−7 per degree Celsius), which ensures excellent structural flexibility and thermomechanical properties. They show high thermal stability with ultralow strength degradation (less than 1 per cent) after sharp thermal shocks, and a high working temperature (up to 1,300 degrees Celsius). By deliberately entrapping residue carbon species in the constituent hypocrystalline zircon fibres, we substantially reduce the thermal radiation heat transfer and achieve one of the lowest high-temperature thermal conductivities among ceramic aerogels so far—104 milliwatts per Metre Per Kelvin at 1000 Degrees Celsius. IES OFFER An Attractive Material System for Robust Thermal Insulation under Extreme Conditions.

Intermittent Lab Earthquakes in Dynamically Weakening Fault Gouge

Dynamic weakness of the intermittent laboratory earthquake in the fault mud

Author: v. Rubino, n. Lapusta a. J. Rosakis

Link:

https://www.nature.com/articleS/S41586-022-04749-3

Summary:

Here, through laboratory experiments, we found that the dynamic rupture of the spontaneous communication through complex, intermittent sliding process and severe friction evolution in navigation in the fault area with fine rocks. This includes the repeated stop of the rupture expansion caused by the increase in friction at a lower slip rate, and the significant and rapidly weakening of the power earthquake caused by the high slip rate of higher slip rates at a higher slip rate in consistent with the flash speed heating.

The spontaneous weakening and enhancement of friction in the fine rock fracture mud highly highlights the basic dependencies of friction on sliding rate and related processes, such as shear heating, partiality and non -localization of shear, and the expansion and pressure of the shear layer. Reality. Our discovery expands the experimental support of the concept of a breakthrough in the breakthrough of the earthquake rupture and breakthrough, which is of great significance for studying the risk of earthquakes.

Abstract:

Here, using lab experiments, we show that spontaneously propagating dynamic ruptures navigate a fault region with fine rock gouge through complex, intermittent slip processes with dramatic friction evolution. These include repeated arrest of rupture propagation caused by friction strengthening at lower slip rates and dynamic earthquake re-nucleation enabled by pronounced rapid friction weakening at higher slip rates consistent with flash heating. The spontaneous repeated weakening and strengthening of friction in fine rock gouge highlights the fundamental dependence of friction on slip rate and associated processes, such as shear heating, localization and delocalization of shear, and dilation and compaction of the shear layer. Our findings expand experimental support of the concept that co-seismic weakening may enable earthquake rupture to break through stable fault regions, with substantial implications for seismic hazard.编辑| 方圆

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