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An experimental setup with controllable tuning parameters for studying the kondo systems

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Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 121-122页

作者： Zhong-Yi Lu Department of Physics Renmin University of ChinaBeijing 100872China

The kondo physics has been studied since the 1960 s in condensed matter physics[1,2],which is mainly determined by two competing factors namely the kondo effect and the Ruderman-Kittel-Kasuya-Yosida(RKKY)interaction.

关键词： interaction kondo condensed

Thermoelectric Phenomena in a Quantum Dot Attached to Ferromagnetic Leads in kondo Regime

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Communications in Theoretical Physics 2014年第9期61卷 417-422页

作者：陈桥赵丽丽 Department of Maths and Physics Hunan Institute of Engineering The Cooperative Innovation Center of Wind Power Equipment and Energy Conversion Department of Fundamental Courses Academy of Armored Force Engineering

We have studied the thermoelectric properties through ferromagnetic leads-QD coupled system(F-QD-F)in the kondo regime by nonequilibrium Green's functions method. The spin-flip effect induced by ferromagnetic leads and kondo effect influence the thermoelectric properties significantly. The peak-valley structure emerges at the low temperature due to kondo resonance, and the peak-valley structure also relies on the polarization angle θ, the spindependent linewidth function Γγσ and the energy level of QD ?d. Novel resonant peak also emerges in the curve of ZTc versus polarization angle θ. The kondo effect suppresses the figure of merit ZTc and the spin-dependent figure of merit ZTs. In addition, the spin-dependent figure of merit ZTs is relate with the gap between Γγ↑and Γγ↓.

关键词： thermoelectric properties kondo effect ferromagnetic leads nonequilibrium Green’s function

Oxidative phosphorylation safeguards pluripotency via UDP-N-acetylglucosamine

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Protein & Cell 2023年第5期14卷 376-381页

作者： Jiani Cao Meng Li Kun Liu Xingxing Shi Ning Sui Yuchen Yao Xiaojing Wang Shiyu Li Yuchang Tian Shaojing Tan Qian Zhao Liang Wang Xiahua Chai Lin Zhang Chong Liu Xing Li Zhijie Chang Dong Li Tongbiao Zhao State Key Laboratory of Stem Cell and Reproductive Biology Institute for Stem Cell and RegenerationInstitute of ZoologyChinese Academy of SciencesBeijing 100101China State Key Laboratory of Membrane Biology School of MedicineCenter for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084China Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China Qufu Normal University Qufu 273165China University of Chinese Academy of Sciences Beijing 100049China

Dear Editor,Embryonic stem cells(ESCs)have been assumed to possess immature mitochondria and to favor anaerobic glycolysis over oxidative phosphorylation(OXPHOS)for energy production.This proposition is largely based on the findings that ESCs possess globular mitochondria with blurred cristae,and the facts that ESCs have higher glycolysis activity and lower mitochondrial respiration capacity than somatic cells(kondoh et al.,2007;Folmes et al.,2011,2012;Zhang et al.,2012;Xu et al.,2013;Ito and Suda,2014;Gu et al.,2016).However,recent studies have shown that mitochondrial autophagy and mitochondrial dynamics are pivotal for ESC self-renewal and pluripotency(Todd et al.,2010;Liu et al.,2016,2020;Wang et al.,2019;Zhong et al.,2019).These studies have raised a fundamental question:what is the contribution and functional mechanism of mitochondrial respiration in pluripotency regulation?

关键词： kondo phosphorylation raised

Predicted High-Temperature Superconductivity in Rare Earth Hydride ErH2 at Moderate Pressure

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Chinese Physics Letters 2022年第12期39卷 84-88页

作者：刘一丁范强杨建会王丽丽张伟斌姚钢 College of Mathematics and Physics Leshan Normal UniversityLeshan 614004China Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China School of New Energy Materials and Chemistry Leshan Normal UniversityLeshan 614004China Institute of Computer Application China Academy of Engineering PhysicsMianyang 621900China College of Physics and Electronics Information Yunnan Key Laboratory of Optoelectronic Information TechnologyYunnan Normal UniversityKunming 650500China School of Physical Science and Technology Southwest UniversityChongqing 400715China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

Hydrides offer an opportunity to study high critical temperature(high-Tc)superconductivity at experimentally achievable pressures.However,the pressure needed remains extremely high.Using density functional theory calculations,herein we demonstrate that a new rare earth hydride ErH2could be superconducting with Tc~80 K at 14.5 GPa,the lowest reported value for compressed hydrides to date.Intriguingly,due to kondo destruction,superconductivity was prone to exist at 15 GPa.We also reveal an energy gap at 20 GPa on the background of normal metallic states.At 20 GPa,this compressed system could act as a host of superconductor judged from a sharp jump of spontaneous magnetic susceptibility with an evanescent spin density of state at Fermi level.Finally,electron pairing glue for ErH2at these three typical pressures was attributed to the antiferromagnetic spin fluctuation.

关键词： Rare kondo superconductor

Olfactory dysfunction as a common biomarker for neurodegenerative and neuropsychiatric disorders

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Neural Regeneration Research 2023年第5期18卷 1029-1030页

作者： David Slabik Olga Garaschuk Department of Psychiatry and Psychotherapy Tübingen Center for Mental HealthEberhard Karls University of TübingenTübingenGermany Institute of Physiology Department NeurophysiologyEberhard Karls University of TübingenTübingenGermany

The sense of smell supports the identification and the safety of food,warns of danger/predators,and plays a key role in mating(Croy and Hummel,2017;kondo et al.,2020;Tzeng et al.,2021).Via connection to the limbic system,it supports behavioral adaption and emotions and can detect fear,tears,and happiness in the body odor of others(Croy and Hummel,2017;Tzeng et al.,2021).

关键词： kondo tears al.

Machine learning assisted derivation of minimal low-energy models for metallic magnets

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npj Computational Materials 2023年第1期9卷 353-364页

作者： Vikram Sharma Zhentao Wang Cristian D.Batista Department of Physics and Astronomy The University of TennesseeKnoxvilleTN 37996USA School of Physics and Astronomy University of MinnesotaMinneapolisMN 55455USA Quantum Condensed Matter Division and Shull-Wollan Center Oak Ridge National LaboratoryOak RidgeTN 37831USA Present address:Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China

We consider the problem of extracting a low-energy spin Hamiltonian from a triangular kondo Lattice Model(KLM).The non-analytic dependence of the effective spin-spin interactions on the kondo exchange excludes the use of perturbation theory beyond the second order.We then introduce a Machine Learning(ML)assisted protocol to extract effective two-and four-spin interactions.The resulting spin model reproduces the phase diagram of the original KLM as a function of magnetic field and single-ion anisotropy and reveals the effective four-spin interactions that stabilize the field-induced skyrmion crystal phase.Moreover,this model enables the computation of static and dynamical properties with a much lower numerical cost relative to the original KLM.A comparison of the dynamical spin structure factor in the fully polarized phase computed with both models reveals a good agreement for the magnon dispersion even though this information was not included in the training data set.

关键词： kondo dynamical derivation

Evidence of Electronic Phase Separation in the Strongly Correlated Semiconductor YbB_(12)

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Chinese Physics Letters 2022年第12期39卷 65-70页

作者： A.Azarevich N.Bolotina O.Khrykina A.Bogach E.Zhukova B.Gorshunov A.Melentev Z.Bedran A.Alyabyeva M.Belyanchikov V.Voronov N.Yu.Shitsevalova V.B.Filipov N.Sluchanko Prokhorov General Physics Institute of the Russian Academy of Sciences Vavilov Str.38Moscow 119991Russia Shubnikov Institute of Crystallography Federal Scientific Research Centre‘Crystallography and Photonics’of Russian Academy of Sciences59 Leninskiy ProspectMoscow 119333Russia Center for Photonics and 2D Materials Moscow Institute of Physics and Technology(National Research University)141700 DolgoprudnyMoscow RegionRussia Institute for Problems of Materials Science NASUKrzhizhanovsky Str.303142 KyivUkraine

We investigate high-quality single-domain crystals of YbB_(12)using the precise x-ray diffraction technique in combination with the low-temperature polarized THz–infrared spectroscopy and accurate magnetotransport measurements.It is shown for the first time that this archetypal strongly correlated system with a metal-insulator transition to a mysterious dielectric ground state with a metal Fermi surface[Science 362,65(2018)and ibid 362,32(2018)]is actually a heterogeneous compound in the regime of electronic phase separation.Changes in the configuration of the discovered dynamic charge stripes are proposed upon cooling.As a result,a conclusion is drawn in favor of a crossover between different patterns of the filamentary electronic structure penetrating the semiconducting matrix of YbB_(12).We argue that the discovery of stripes in YbB_(12)is fundamental,elucidating the nature of exotic dielectric state in kondo insulators.

关键词： insulator kondo dielectric

Finite temperature physics of ID to pological kondo insulator: Stable Haldane phase, emergent energy scale and beyond

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Frontiers of physics 2019年第2期14卷 73-81,F0004页

作者： Yin Zhong Qin Wang Yu Liu Hai-Feng Song Ke Liu Hong-Gang Luo Center for Interdisciplinary Studies & Key Laboratory for Magnetism and Magnetic Materials of the MoE Lanzhou UniversityLanzhou 730000China Institute of Applied Physics and Computational Mathematics Beijing 100088China Software Center for High Performance Numerical Simulation China Academy of Engineering PhysicsBeijing 100088China Arnold Sommerfeld Center for Theoretical Physics University of MunichTheresienstrasse 3780333 MunichGermany Beijing Computational Science Research Center Beijing 100084China

In recent years, mteracting topological insulators have emerged as new frontiers in condensed matter physics, and the hotly studied topological kondo insulator (TKI) is one of such prototypes. Although its zero-temperature ground-state has been widely investigated, the finite temperature physics on TKI is largely unknown. Here, we explore the finite temperature properties in a simplified model for TKI. namely the one-dimensional p-wave periodic Anderson model, with numerically exact determinant quantum Monte Carlo simulation. It is found that the topological Haldane phase established for groimdstate is still stable against small thermal fluctuation and its characteristic edge magnetization develops at low temperature. Such facts emphasize the robustness of (symmetry-protected) topological order against temperature effect, which always exists at real physical world. Moreover, we use the saturated low-T spin structure factor and the 1/T-law of susceptibility to detect the free edge spin moment, interestingly the low-temperature upturn behaxior of the latter one is similar to experimental finding in SniBg at T kondo screening effect has been examined and it is heavily reduced at boundary which may give a fruitful playground for novel physics beyond the wellestablished Haldane phase and topological band insulators.

关键词： topological kondo insulator heavy fermion quantum Monte Carlo Haldane phase

Magnetoresistance and kondo Effect in Nodal-Line Semimetal VAs_(2)

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Chinese Physics Letters 2021年第1期38卷 92-98页

作者：陈水金娄哲丰周宇星陈琴许彬杰吴春翔杜建华杨金虎王杭栋方明虎 Department of Physics Zhejiang UniversityHangzhou 310027China Department of Applied Physics China Jiliang UniversityHangzhou 310018China Department of Physics Hangzhou Normal UniversityHangzhou 310036China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

We performed calculations of the electronic band structure and the Fermi surface,measured the longitudinal resistivity ρxx(T,H),Hall resistivity ρxy(T,H),and magnetic susceptibility as a function of temperature at various magnetic fields for VAs_(2) with a monoclinic crystal structure.The band structure calculations show that VAs_(2) is a nodal-line semimetal when spin-orbit coupling is ignored.The emergence of a minimum at around11 K in ρxx(T) measured at H=0 demonstrates that some additional magnetic impurities(V^(4+),S=1/2)exist in VAs_(2) single crystals,inducing kondo scattering,evidenced by both the fitting of ρxx(T) data and the susceptibility measurements.It is found that a large positive magnetoresistance(MR) reaching 649% at 10 K and 9 T,its nearly quadratic field dependence,and a field-induced up-turn behavior of ρxx(T) also emerge in VAs_(2),although MR is not so large due to the existence of additional scattering compared with other topological nontrivial/trivial semimetals.The observed properties are attributed to a perfect charge-carrier compensation,which is evidenced by both the calculations relying on the Fermi surface and the Hall resistivity measurements.These results indicate that the compounds containing V(3d^(3)4s^(2)) element can be as a platform for studying the influence of magnetic impurities to the topological properties.

关键词： resistance kondo resistivity