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arXiv 2018年

作者： Takeuchi, Yuki Mantri, Atul Morimae, Tomoyuki Mizutani, Akihiro Fitzsimons, Joseph F. Graduate School of Engineering Science Osaka University Toyonaka Osaka560-8531 Japan NTT Communication Science Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi-shi Kanagawa243-0198 Japan Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore Centre for Quantum Technologies National University of Singapore Block S15 3 Science Drive 2 Singapore117543 Singapore School of Informatics University of Edinburgh 10 Crichton Street EdinburghEH8 9AB United Kingdom Yukawa Institute for Theoretical Physics Kyoto University Kitashirakawa Oiwakecho Sakyo-ku Kyoto606-8502 Japan JST PRESTO 4-1-8 Honcho Kawaguchi Saitama332-0012 Japan Mitsubishi Electric Corporation Information Technology R & D Center 5-1-1 Ofuna Kamakura-shi Kanagawa247-8501 Japan Horizon Quantum Computing 79 Ayer Rajah Crescent #03-01 BASH Singapore139955

Verifying quantum states is central to certifying the correct operation of various quantum information processing tasks. In particular, in measurement-based quantum computing, checking whether correct graph states are generated is essential for reliable quantum computing. Several verification protocols for graph states have been proposed, but none of these are particularly resource efficient: multiple copies are required to extract a single state that is guaranteed to be close to the ideal one. The best protocol currently known requires O(n15) copies of the state, where n is the size of the graph state. In this paper, we construct a significantly more resource-efficient verification protocol for graph states that only requires O(n5 log n) copies. The key idea is to employ Serfling's bound, which is a probability inequality in classical statistics. Utilizing Serfling's bound also enables us to generalize our protocol for qudit and continuous-variable graph states. Constructing a resource-efficient verification protocol for them is non-trivial. For example, the previous verification protocols for qubit graph states that use the quantum de Finetti theorem cannot be generalized to qudit and continuous-variable graph states without tremendously increasing the resource overhead. This is because the overhead caused by the quantum de Finetti theorem depends on the local dimension. On the other hand, in our protocol, the resource overhead is independent of the local dimension, and therefore generalizing to qudit or continuous-variable graph states does not increase the overhead. The flexibility of Serfling's bound also makes our protocol robust: our protocol accepts slightly noisy but still useful graph states. Copyright © 2018, The Authors. All rights reserved.

关键词： quantum optics

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Comment on 'Inherent security of phase coding quantum key distribution systems against detector blinding attacks' (2018 Laser Phys. Lett. 15 095203)

引用

Laser Physics Letters 2018年第1期16卷

作者： Aleksey Fedorov Ilja Gerhardt Anqi Huang Jonathan Jogenfors Yury Kurochkin Antía Lamas-Linares Jan-Åke Larsson Gerd Leuchs Lars Lydersen Vadim Makarov Johannes Skaar Russian Quantum Center Skolkovo Moscow 143025 Russia QRate Skolkovo Moscow 143025 Russia QApp Skolkovo Moscow 143025 Russia Institute of Physics University of Stuttgart and Institute for Quantum Science and Technology Pfaffenwaldring 57 D-70569 Stuttgart Germany Max Planck Institute for Solid State Research Heisenbergstraße 1 D-70569 Stuttgart Germany Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 People's Republic of China Department of Electrical Engineering Linköping University SE-58183 Linköping Sweden Texas Advanced Computing Center The University of Texas at Austin Austin Texas United States of America Max Planck Institute for the Science of Light and University of Erlangen-Nürnberg D-91058 Erlangen Germany Kringsjåvegen 3E NO-7032 Trondheim Norway National University of Science and Technology MISIS Moscow 119049 Russia Department of Technology Systems University of Oslo Box 70 NO-2027 Kjeller Norway

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Measuring holographic entanglement entropy on a quantum simulator

arXiv

引用

arXiv 2017年

作者： Li, Keren Han, Muxin Qu, Dongxue Huang, Zichang Long, Guilu Wan, Yidun Lu, Dawei Zeng, Bei Laflamme, Raymond Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen518055 China Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing100084 China Department of Physics Florida Atlantic University 777 Glades Road Boca RatonFL33431 United States Institut für Quantengravitation Universität Erlangen-Nürnberg Staudtstr. 7/B2 Erlangen91058 Germany State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Department of Physics and Center for Field Theory and Particle Physics Fudan University Shanghai200433 China Institute for Nanoelectronic devices and Quantum computing Fudan University Shanghai200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen518055 China Department of Mathematics and Statistics University of Guelph GuelphONN1G 2W1 Canada Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada

quantum simulation promises to have wide applications in many fields where problems are hard to model with classical computers. Various quantum devices of different platforms have been built to tackle the problems in, say, quantum chemistry, condensed matter physics, and high-energy physics. Here, we report an experiment towards the simulation of quantum gravity by simulating the holographic entanglement entropy. On a six-qubit nuclear magnetic resonance quantum simulator, we demonstrate a key result of Anti-de Sitter/conformal field theory(AdS/CFT ) correspondence-the Ryu-Takayanagi formula is demonstrated by measuring the relevant entanglement entropies on the perfect tensor state. The fidelity of our experimentally prepared the six-qubit state is 85.0% via full state tomography and reaches 93.7%if the signal-decay due to decoherence is taken into account. Our experiment serves as the basic module of simulating more complex tensor network states that exploring AdS/CFT correspondence. As the initial experimental attempt to study AdS/CFT via quantum information processing, our work opens up new avenues exploring quantum gravity phenomena on quantum simulators. Copyright © 2017, The Authors. All rights reserved.

关键词： quantum chemistry

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Anomalous Hall effect scaling in ferromagnetic thin films

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Physical Review B 2017年第14期96卷 144426-144426页

作者： Vahram L. Grigoryan Jiang Xiao (萧江) Xuhui Wang Ke Xia The Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China Beijing Normal University Zhuhai 519087 Guangdong China Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Institute for Nanoelectronics Devices and Quantum Computing Fudan University Shanghai 200433 China King Abdullah University of Science and Technology (KAUST) Physical Science and Engineering Division Thuwal 23955-6900 Saudi Arabia Synergetic Innovation Center for Quantum Effects and Applications (SICQEA) Hunan Normal University Changsha 410081 China

We propose a scaling law for anomalous Hall effect in ferromagnetic thin films. Our approach distinguishes multiple scattering sources, namely, bulk impurity, phonon for Hall resistivity, and most importantly the rough surface contribution to longitudinal resistivity. In stark contrast to earlier laws that rely on temperature- and thickness-dependent fitting coefficients, this scaling law fits the recent experimental data excellently with constant parameters that are independent of temperature and film thickness, strongly indicating that this law captures the underlying physical processes. Based on a few data points, this scaling law can even fit all experimental data in full temperature and thickness range. We apply this law to interpret the experimental data for Fe, Co, and Ni and conclude that (i) the phonon-induced skew scattering is unimportant as expected; (ii) contribution from the impurity-induced skew scattering is negative; (iii) the intrinsic (extrinsic) mechanism dominates in Fe (Co), and both the extrinsic and intrinsic contributions are important in Ni.

关键词： Anomalous Hall effect Ferromagnetism Spin-orbit coupling

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Dimensionality-driven orthorhombic MoTe2 at room temperature

arXiv

引用

arXiv 2018年

作者： He, Rui Zhong, Shazhou Kim, Hyun Ho Ye, Gaihua Ye, Zhipeng Winford, Logan McHaffie, Daniel Rilak, Ivana Chen, Fangchu Luo, Xuan Sun, Yuping Tsen, Adam W. Department of Electrical and Computer Engineering Texas Tech University LubbockTX79409 United States Department of Physics University of Northern Iowa Cedar FallsIA50614 United States Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics University of Waterloo WaterlooONN2L 3G1 Canada Department of Chemistry University of Waterloo WaterlooONN2L 3G1 Canada Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China High Magnetic Field Laboratory Chinese Academy of Sciences Hefei230031 China Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing210093 China

We use a combination of Raman spectroscopy and transport measurements to study thin flakes of the type-II Weyl semimetal candidate MoTe2 protected from oxidation. In contrast to bulk crystals, which undergo a phase transition from monoclinic to the inversion symmetry breaking, orthorhombic phase below ~250 K, we find that in moderately thin samples below ~12 nm, a single orthorhombic phase exists up to and beyond room temperature. This could be due to the effect of c-axis confinement, which lowers the energy of an out-of-plane hole band and stabilizes the orthorhombic structure. Our results suggest that Weyl nodes, predicated upon inversion symmetry breaking, may be observed in thin MoTe2 at room temperature. Copyright © 2018, The Authors. All rights reserved.

关键词： Crystal symmetry

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The PROSPECT reactor antineutrino experiment

arXiv

引用

arXiv 2018年

作者： Ashenfelter, J. Balantekin, A.B. Baldenegro, C. Band, H.R. Bass, C.D. Bergeron, D.E. Berish, D. Bignell, L.J. Bowden, N.S. Boyle, J. Bricco, J. Brodsky, J.P. Bryan, C.D. Bykadorova Telles, A. Cherwinka, J.J. Classen, T. Commeford, K. Conant, A. Cox, A.A. Davee, D. Dean, D. Deichert, G. Diwan, M.V. Dolinski, M.J. Erickson, A. Foust, B.T. Gaison, J.K. Galindo-Uribarri, A. Gilbert, C. Gilje, K. Glenn, A. Goddard, B.W. Hackett, B. Han, K. Hans, S. Hansell, A.B. Heeger, K.M. Heffron, B. Insler, J. Jaffe, D.E. Ji, X. Jones, D.C. Koehler, K. Kyzylova, O. Lane, C.E. Langford, T.J. LaRosa, J. Littlejohn, B.R. Lopez, F. Lu, X. Martinez Caicedo, D.A. Matta, J.T. McKeown, R.D. Mendenhall, M.P. Miller, H.J. Minock, J. Mueller, P.E. Mumm, H.P. Napolitano, J. Neilson, R. Nikkel, J.A. Norcini, D. Nour, S. Pushin, D.A. Qian, X. Romero-Romero, E. Rosero, R. Sarenac, D. Seilhan, B. Sharma, R. Surukuchi, P.T. Trinh, C. Tyra, M.A. Varner, R.L. Viren, B. Wagner, J.M. Wang, W. White, B. White, C. Wilhelmi, J. Wise, T. Yao, H. Yeh, M. Yen, Y.-R. Zhang, A. Zhang, C. Zhang, X. Zhao, M. Brookhaven National Laboratory UptonNY United States Department of Physics Drexel University PhiladelphiaPA United States George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA United States Department of Physics Illinois Institute of Technology ChicagoIL United States Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory LivermoreCA United States Department of Physics Le Moyne College SyracuseNY United States National Institute of Standards and Technology GaithersburgMD United States High Flux Isotope Reactor Oak Ridge National Laboratory Oak RidgeTN United States Physics Division Oak Ridge National Laboratory Oak RidgeTN United States Department of Physics Temple University PhiladelphiaPA United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN United States Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo WaterlooON Canada Department of Physics University of Wisconsin Madison MadisonWI United States Physical Sciences Laboratory University of Wisconsin Madison MadisonWI United States Department of Physics College of William and Mary WilliamsburgVA United States Wright Laboratory Department of Physics Yale University New HavenCT United States

The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is designed to make both a precise measurement of the antineutrino spectrum from a highly-enriched uranium reactor and to probe eV-scale sterile neutrinos by searching for neutrino oscillations over meter-long baselines. PROSPECT utilizes a segmented 6Li-doped liquid scintillator detector for both efficient detection of reactor antineutrinos through the inverse beta decay reaction and excellent background discrimination. PROSPECT is a movable 4-ton antineutrino detector covering distances of 7 m to 13 m from the HFIR reactor core. It will probe the best-fit point of the ν¯e disappearance experiments at 4 σ in 1 year and the favored regions of the sterile neutrino parameter space at more than 3 σ in 3 years. PROSPECT will test the origin of spectral deviations observed in recent Theta13 experiments, search for sterile neutrinos, and address the hypothesis of sterile neutrinos as an explanation of the reactor anomaly. Copyright © 2018, The Authors. All rights reserved.

关键词： Neutrons

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Measurement of the Antineutrino Spectrum from 235U Fission at HFIR with PROSPECT

arXiv

引用

arXiv 2018年

作者： Ashenfelter, J. Balantekin, A.B. Band, H.R. Bass, C.D. Bergeron, D.E. Berish, D. Bowden, N.S. Brodsky, J.P. Bryan, C.D. Cherwinka, J.J. Classen, T. Conant, A.J. Cox, A.A. Davee, D. Dean, D. Deichert, G. Diwan, M.V. Dolinski, M.J. Erickson, A. Febbraro, M. Foust, B.T. Gaison, J.K. Galindo-Uribarri, A. Gilbert, C.E. Gilje, K.E. Hackett, B.T. Hans, S. Hansell, A.B. Heeger, K.M. Insler, J. Jaffe, D.E. Ji, X. Jones, D.C. Kyzylova, O. Lane, C.E. Langford, T.J. LaRosa, J. Littlejohn, B.R. Lu, X. Martinez Caicedo, D.A. Matta, J.T. McKeown, R.D. Mendenhall, M.P. Minock, J.M. Mueller, P.E. Mumm, H.P. Napolitano, J. Neilson, R. Nikkel, J.A. Norcini, D. Nour, S. Pushin, D.A. Qian, X. Romero-Romero, E. Rosero, R. Sarenac, D. Surukuchi, P.T. Telles, A.B. Tyra, M.A. Varner, R.L. Viren, B. White, C. Wilhelmi, J. Wise, T. Yeh, M. Yen, Y.-R. Zhang, A. Zhang, C. Zhang, X. Brookhaven National Laboratory UptonNY United States Department of Physics Drexel University PhiladelphiaPA United States George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA United States Department of Physics Illinois Institute of Technology ChicagoIL United States Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory LivermoreCA United States Department of Physics Le Moyne College SyracuseNY United States National Institute of Standards and Technology GaithersburgMD United States High Flux Isotope Reactor Oak Ridge National Laboratory Oak RidgeTN United States Physics Division Oak Ridge National Laboratory Oak RidgeTN United States Department of Physics Temple University PhiladelphiaPA United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN United States Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo WaterlooON Canada Department of Physics University of Wisconsin Madison MadisonWI United States Physical Sciences Laboratory University of Wisconsin Madison MadisonWI United States Department of Physics College of William and Mary WilliamsburgVA United States Wright Laboratory Department of Physics Yale University New HavenCT United States

This Letter reports the first measurement of the 235U νe energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MWth highly-enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678 ±304 (stat.) νe-induced inverse beta decays (IBD), the largest sample from HEU fission to date, 99 % of which are attributed to 235U. Despite broad agreement, comparison of the Huber 235U model to the measured spectrum produces a χ2/ndf = 51.4/31, driven primarily by deviations in two localized energy regions. The measured 235U spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the νe energy region of 5-7 MeV. Copyright © 2018, The Authors. All rights reserved.

关键词： Uranium

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Performance of a segmented 6Li-loaded liquid scintillator detector for the PROSPECT experiment

arXiv

引用

arXiv 2018年

作者： Ashenfelter, J. Balantekin, A.B. Band, H.R. Bass, C.D. Bergeron, D.E. Berish, D. Bowden, N.S. Brodsky, J.P. Bryan, C.D. Bykadorova Telles, A. Cherwinka, J.J. Classen, T. Commeford, K. Conant, A. Davee, D. Deichert, G. Diwan, M.V. Dolinski, M.J. Erickson, A. Foust, B.T. Gaison, J.K. Galindo-Uribarri, A. Gilje, K. Hackett, B. Han, K. Hans, S. Hansell, A. Heeger, K.M. Heffron, B. Insler, J. Jaffe, D.E. Jones, D. Kyzylova, O. Lane, C.E. Langford, T.J. LaRosa, J. Littlejohn, B.R. Lopez, F. Martinez Caicedo, D.A. Matta, J. McKeown, R.D. Mendenhall, M.P. Minock, J. Mueller, P.E. Mumm, H.P. Napolitano, J. Neilson, R. Nikkel, J.A. Norcini, D. Nour, S. Pushin, D.A. Qian, X. Romero-Romero, E. Rosero, R. Surukuchi, P.T. Trinh, C. Tyra, M.A. Wagner, J.M. White, C. Wilhelmi, J. Wise, T. Yeh, M. Yen, Y.-R. Zhang, A. Zhang, C. Zhang, X. Brookhaven National Laboratory UptonNY11973 United States Department of Physics Drexel University PhiladelphiaPA United States George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA United States Department of Physics Illinois Institute of Technology ChicagoIL United States Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory LivermoreCA United States Department of Physics Le Moyne College SyracuseNY United States National Institute of Standards and Technology GaithersburgMD United States High Flux Isotope Reactor Oak Ridge National Laboratory Oak RidgeTN United States Physics Division Oak Ridge National Laboratory Oak RidgeTN United States Department of Physics Temple University PhiladelphiaPA United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN United States Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo WaterlooON Canada Department of Physics University of Wisconsin Madison MadisonWI United States Physical Sciences Laboratory University of Wisconsin Madison MadisonWI United States Department of Physics College of William and Mary WilliamsburgVA United States Wright Laboratory Department of Physics Yale University New HavenCT United States

This paper describes the design and performance of a 50 liter, two-segment 6Li-loaded liquid scintillator detector that was designed and operated as prototype for the PROSPECT (Precision Reactor Oscillation and Spectrum) Experiment. The two-segment detector was constructed according to the design specifications of the experiment. It features low-mass optical separators, an integrated source and optical calibration system, and materials that are compatible with the 6Li-doped scintillator developed by PROSPECT. We demonstrate a high light collection of 850±20 PE/MeV, an energy resolution of σ = 4.0±0.2% at 1 MeV, and efficient pulse-shape discrimination of low dE/dx (electronic recoil) and high dE/dx (nuclear recoil) energy depositions. An effective scintillation attenuation length of 85±3 cm is measured in each segment. The 0.1% by mass concentration of 6Li in the scintillator results in a measured neutron capture time of τ = 42.8±0.2 µs. The long-term stability of the scintillator is also discussed. The detector response meets the criteria necessary for achieving the PROSPECT physics goals and demonstrates features that may find application in fast neutron detection. Copyright © 2018, The Authors. All rights reserved.

关键词： Neutrons

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quantum state and process tomography via adaptive measurements

引用

Science China(Physics,Mechanics & Astronomy) 2016年第10期59卷 25-32页

作者： HengYan Wang WenQiang Zheng NengKun Yu KeRen Li DaWei Lu Tao Xin Carson Li ZhengFeng Ji David Kribs Bei Zeng XinHua Peng JiangFeng Du Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Department of Applied Physics Zhejiang University of TechnologyHangzhou 310023China Institute for Quantum Computing University of WaterlooWaterloo N2L 3G1Canada 4Department of Mathematics&Statistics University of GuelphGuelph N1G 2W1Canada Centre for Quantum Computation&Intelligent Systems Faculty of Engineering and Information TechnologyUniversity of Technology SydneySydney NSW 2007Australia State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Department of Physics University of GuelphGuelph N1G 2W1Canada State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China Canadian Institute for Advanced Research Toronto M5G 1Z8Canada

We investigate quantum state tomography(QST) for pure states and quantum process tomography(QPT) for unitary channels via adaptive measurements. For a quantum system with a d-dimensional Hilbert space, we first propose an adaptive protocol where only 2d. 1 measurement outcomes are used to accomplish the QST for all pure states. This idea is then extended to study QPT for unitary channels, where an adaptive unitary process tomography(AUPT) protocol of d2+d.1measurement outcomes is constructed for any unitary channel. We experimentally implement the AUPT protocol in a 2-qubit nuclear magnetic resonance system. We examine the performance of the AUPT protocol when applied to Hadamard gate, T gate(/8 phase gate), and controlled-NOT gate,respectively, as these gates form the universal gate set for quantum information processing purpose. As a comparison, standard QPT is also implemented for each gate. Our experimental results show that the AUPT protocol that reconstructing unitary channels via adaptive measurements significantly reduce the number of experiments required by standard QPT without considerable loss of fidelity.

关键词： quantum tomography state reconstruction nuclear magnetic resonance

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Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe2Ge2

arXiv

引用

arXiv 2018年

作者： Wo, Hongliang Wang, Qisi Shen, Yao Zhang, Xiaowen Hao, Yiqing Feng, Yu Shen, Shoudong He, Zheng Pan, Bingying Wang, Wenbin Nakajima, K. Ohira-Kawamura, S. Steffens, P. Boehm, M. Schmalzl, K. Forrest, T.R. Matsuda, M. Zhao, Yang Lynn, J.W. Yin, Zhiping Zhao, Jun State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Institute of Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Materials and Life Science Division J-PARC Center Tokai Ibaraki319-1195 Japan Institut Laue-Langevin 71 Avenue des Martyrs Grenoble Cedex 938042 France Forschungszentrum Jülich GmbH Jülich Centre for Neutron Science at ILL 71 Avenue des Martyrs Grenoble38000 France Diamond Light Source Harwell Campus DidcotOX11 0DE United Kingdom Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States NIST Center for Neutron Research National Institute of Standards and Technology GaithersburgMD20899 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742 United States Department of Physics and Center for Advanced Quantum Studies Beijing Normal University Beijing100875 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

We report neutron scattering measurements of single-crystalline YFe2Ge2 in the normal state, which has the same crystal structure to the 122 family of iron pnictide superconductors. YFe2Ge2 does not exhibit long range magnetic order, but exhibits strong spin fluctuations. Like the iron pnictides, YFe2Ge2 displays anisotropic stripe-type antiferromagnetic spin fluctuations at (π, 0, π). More interesting, however, is the observation of strong spin fluctuations at the in-plane ferromagnetic wavevector (0, 0, π). These ferromagnetic spin fluctuations are isotropic in the (H, K) plane, whose intensity exceeds that of stripe spin fluctuations. Both the ferromagnetic and stripe spin fluctuations remain gapless down to the lowest measured energies. Our results naturally explain the absence of magnetic order in YFe2Ge2 and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials. Copyright © 2018, The Authors. All rights reserved.

关键词： Crystal structure

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