npj Quantum Materials最新文献

Giant tunability of superlattice excitations in chiral Cr1/3TaS2

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-03-03 DOI: 10.1038/s41535-025-00734-x

J. L. Musfeldt, Y. Gu, J. T. Haraldsen, K. Du, P. Yapa, J. Yang, D. G. Mandrus, S. -W. Cheong, Z. Liu

{"title":"Giant tunability of superlattice excitations in chiral Cr1/3TaS2","authors":"J. L. Musfeldt, Y. Gu, J. T. Haraldsen, K. Du, P. Yapa, J. Yang, D. G. Mandrus, S. -W. Cheong, Z. Liu","doi":"10.1038/s41535-025-00734-x","DOIUrl":"https://doi.org/10.1038/s41535-025-00734-x","url":null,"abstract":"Layered chalcogenides are superb platforms for exploring tunable functionality and the impact of external stimuli, and when intercalated with metal atoms, there are opportunities to reveal unique guest–host interactions. One barrier to greater control of the collective metal monolayer excitations in these materials is the absence of detailed information about how they evolve under compression. In order to explore superlattice excitations in a series of intercalated chalcogenides, we measured the Raman scattering response of Cr1/3TaS2 under pressure and compared our findings with the behavior of Cr1/3NbS2, Fe1/3TaS2, and Fe1/4TaS2. Overall, we find that the metal monolayer excitations are sharp and strong, spanning a significant portion of the teraHertz range. Analysis reveals that chalcogen layer thickness and size of the van der Waals gap to that of the A site ion are sufficient to divide these materials into two classes: the Cr analogs with relatively little distortion of the metal monolayer excitations under compression and the Fe analogs that host substantial symmetry breaking. In addition to unraveling these structure-property relations, we combine pressure and strain to demonstrate that the superlattice excitation in Cr1/3TaS2 can be tuned in a nearly linear fashion by approximately 16% overall in frequency space—a significant advance for spintronics and photonics applications.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"25 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143532633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microscopic roadmap to a Kitaev-Yao-Lee spin-orbital liquid

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-03-01 DOI: 10.1038/s41535-025-00744-9

Derek Churchill, Emily Z. Zhang, Hae-Young Kee

{"title":"Microscopic roadmap to a Kitaev-Yao-Lee spin-orbital liquid","authors":"Derek Churchill, Emily Z. Zhang, Hae-Young Kee","doi":"10.1038/s41535-025-00744-9","DOIUrl":"https://doi.org/10.1038/s41535-025-00744-9","url":null,"abstract":"The exactly solvable spin-1/2 Kitaev model on a honeycomb lattice has drawn significant interest, as it offers a pathway to realizing the long-sought-after quantum spin liquid. Building upon the Kitaev model, Yao and Lee introduced another exactly solvable model on an unusual star lattice featuring non-abelian spinons. The additional pseudospin degrees of freedom in this model could provide greater stability against perturbations, making this model appealing. However, a mechanism to realize such an interaction in a standard honeycomb lattice remains unknown. Here, we provide a microscopic theory to obtain the Yao-Lee model, on a honeycomb lattice by utilizing strong spin-orbit coupling of anions edge-shared between two eg ions in the exchange processes. This mechanism leads to the desired bond-dependent interaction among spins rather than orbitals, unique to our model, implying that the orbitals fractionalize into gapless Majorana fermions and fermionic octupolar excitations emerge. Since the conventional Kugel-Khomskii interaction also appears, we examine the phase diagram, including these interactions, using classical Monte Carlo simulations and exact diagonalization techniques. Our findings reveal a broad region of disordered states that break rotational symmetry in the bond energy, suggesting intriguing behavior reminiscent of a spin-orbital liquid.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"33 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fate of transient order parameter domain walls in ultrafast experiments

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-27 DOI: 10.1038/s41535-025-00743-w

Lingxian Kong, Ryuichi Shindou, Zhiyuan Sun

{"title":"Fate of transient order parameter domain walls in ultrafast experiments","authors":"Lingxian Kong, Ryuichi Shindou, Zhiyuan Sun","doi":"10.1038/s41535-025-00743-w","DOIUrl":"https://doi.org/10.1038/s41535-025-00743-w","url":null,"abstract":"In ultrafast experiments, an optical pump pulse often generates transient domain walls of the order parameter in materials with spontaneous symmetry breaking, due to either a finite penetration depth of light on a three-dimensional (3D) material, or a finite spot size on a two-dimensional (2D) material. We show that the domain wall decays due to unstable order parameter fluctuations. We study a generic system with U(1)-symmetric order, and those with an additional weak Z2 (U(1)-symmetry-breaking) term, representing the charge-density-wave (CDW) orders in recent experiments. During the first stage of the decay dynamics, exponentially growing thermal fluctuations convert the domain wall into an interface with randomly distributed topological defects. In the second stage, the topological defects undergo a coarsening dynamics within the interface. For a 2D interface in a 3D system, the coarsening dynamics leads to a diffusive growth of the correlation length. For a one-dimensional (1D) interface in a 2D system with the weak Z2 term, the correlation-length growth shows a crossover from diffusive to sub-diffusive behavior.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"6 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrafast simultaneous manipulation of multiple ferroic orders through nonlinear phonon excitation

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-21 DOI: 10.1038/s41535-025-00738-7

Daniel A. Bustamante Lopez, Dominik M. Juraschek, Michael Fechner, Xianghan Xu, Sang-Wook Cheong, Wanzheng Hu

{"title":"Ultrafast simultaneous manipulation of multiple ferroic orders through nonlinear phonon excitation","authors":"Daniel A. Bustamante Lopez, Dominik M. Juraschek, Michael Fechner, Xianghan Xu, Sang-Wook Cheong, Wanzheng Hu","doi":"10.1038/s41535-025-00738-7","DOIUrl":"https://doi.org/10.1038/s41535-025-00738-7","url":null,"abstract":"Recent experimental studies have demonstrated the possibility of utilizing strong terahertz pulses to manipulate individual ferroic orders on pico- and femtosecond timescales. Here, we extend these findings and showcase the simultaneous manipulation of multiple ferroic orders in BiFeO3, a material that is both ferroelectric and antiferromagnetic at room temperature. We find a concurrent enhancement of ferroelectric and antiferromagnetic second-harmonic generation (SHG) following the resonant excitation of a high-frequency fully-symmetric phonon mode. Based on first-principles calculations and phenomenological modeling, we ascribe this observation to the inherent coupling of the two ferroic orders to the nonequilibrium distortions induced in the crystal lattice by nonlinearly driven phonons. Our finding highlights the potential of nonlinear phononics as a technique for manipulating multiple ferroic order parameters at once. In addition, this approach provides a promising avenue to studying the dynamical magnetic and polarization behavior, as well as their intrinsic coupling, on ultrashort timescales.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"50 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143470742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic memory and distinct spin populations in ferromagnetic Co3Sn2S2

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-19 DOI: 10.1038/s41535-025-00739-6

Charles Menil, Brigitte Leridon, Antonella Cavanna, Ulf Gennser, Dominique Mailly, Linchao Ding, Xiaokang Li, Zengwei Zhu, Benoît Fauqué, Kamran Behnia

引用次数: 0

Time-domain study of coupled collective excitations in quantum materials 量子材料中耦合集体激发的时域研究

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-14 DOI: 10.1038/s41535-025-00726-x

Chenhang Xu, Alfred Zong

{"title":"Time-domain study of coupled collective excitations in quantum materials","authors":"Chenhang Xu, Alfred Zong","doi":"10.1038/s41535-025-00726-x","DOIUrl":"https://doi.org/10.1038/s41535-025-00726-x","url":null,"abstract":"Quantum materials hold immense promises for future applications due to their intriguing electronic, magnetic, thermal, and mechanical properties that often arise from a complex interplay between microscopic degrees of freedom. Important insights of such interactions come from studying the collective excitations of electrons, spins, orbitals, and lattice, whose cooperative motions play a crucial role in determining the novel behavior of these systems and offer us a key tuning knob to modify material properties on-demand through external perturbations. In this regard, ultrafast light-matter interaction has shown great potential in controlling the couplings of collective excitations, and rapid progress in a plethora of time-resolved techniques down to the attosecond regime has significantly advanced our understanding of the coupling mechanisms and guided us in manipulating the dynamical properties of quantum materials. This review aims to highlight recent experiments on visualizing collective excitations in the time domain, focusing on the coupling mechanisms between different collective modes such as phonon-phonon, phonon-magnon, phonon-exciton, magnon-magnon, magnon-exciton, and various polaritons. We introduce how these collective modes are excited by an ultrashort laser pulse and probed by different ultrafast techniques, and we explain how the coupling between collective excitations governs the ensuing nonequilibrium dynamics. We also provide some perspectives on future studies that can lead to discoveries of the emergent properties of quantum materials both in and out of equilibrium.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"18 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fragmented superconductivity in the Hubbard model as solitons in Ginzburg–Landau theory

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-14 DOI: 10.1038/s41535-024-00718-3

Niccolò Baldelli, Hannes Karlsson, Benedikt Kloss, Matthew Fishman, Alexander Wietek

{"title":"Fragmented superconductivity in the Hubbard model as solitons in Ginzburg–Landau theory","authors":"Niccolò Baldelli, Hannes Karlsson, Benedikt Kloss, Matthew Fishman, Alexander Wietek","doi":"10.1038/s41535-024-00718-3","DOIUrl":"https://doi.org/10.1038/s41535-024-00718-3","url":null,"abstract":"The phenomena of superconductivity and charge density waves are observed in close vicinity in many strongly correlated materials. Increasing evidence from experiments and numerical simulations suggests both phenomena can also occur in an intertwined manner, where the superconducting order parameter is coupled to the electronic density. Employing density matrix renormalization group simulations, we investigate the nature of such an intertwined state of matter stabilized in the phase diagram of the elementary (t-{t}^{{prime} }-U) Hubbard model in the strong coupling regime. Remarkably, the condensate of Cooper pairs is shown to be fragmented in the presence of a charge density wave where more than one pairing wave function is macroscopically occupied. Moreover, we provide conclusive evidence that the macroscopic wave functions of the superconducting fragments are well-described by soliton solutions of a Ginzburg-Landau equation in a periodic potential constituted by the charge density wave. In the presence of an orbital magnetic field, the order parameters are gauge invariant, and superconducting vortices are pinned between the stripes. This intertwined Ginzburg-Landau theory is proposed as an effective low-energy description of the stripe fragmented superconductor.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"50 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unprecedentedly large gap in HgBa2Ca2Cu3O8+δ with the highest Tc at ambient pressure

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-14 DOI: 10.1038/s41535-025-00735-w

Chuanhao Wen, Zhiyong Hou, Alireza Akbari, Kailun Chen, Wenshan Hong, Huan Yang, Ilya Eremin, Yuan Li, Hai-Hu Wen

{"title":"Unprecedentedly large gap in HgBa2Ca2Cu3O8+δ with the highest Tc at ambient pressure","authors":"Chuanhao Wen, Zhiyong Hou, Alireza Akbari, Kailun Chen, Wenshan Hong, Huan Yang, Ilya Eremin, Yuan Li, Hai-Hu Wen","doi":"10.1038/s41535-025-00735-w","DOIUrl":"https://doi.org/10.1038/s41535-025-00735-w","url":null,"abstract":"In cuprate superconductors, the highest Tc is possessed by the HgBa2Ca2Cu3O8+δ (Hg-1223) system at ambient pressure, but the reason remains elusive. Here we report the scanning tunneling measurements on the Hg-1223 single crystals with Tc ≈ 134 K. The observed gaps determined from the tunneling spectra (STS) can be categorized into two groups: the smaller gap Δ1 ranges from about 45–70 meV, while the larger gap Δ2 from about 65 to 98 meV. The STS was measured up to 200 K and the larger gap can persist well above Tc, indicating a pseudogap feature which may reflect the strong pairing energy in the inner layer. Interestingly, an extremely strong particle-hole asymmetry is observed in associating with a very robust coherence-like peak at the bias of the larger gap in the hole branch of the Bogoliubov dispersion. We argue that the observed asymmetry results may be from the interplay of a flat band (van Hove singularity) in the electronic spectrum and the larger gap in the underdoped (inner) layer. A theoretical approach based on a trilayer model with an interlayer coupling can give a reasonable explanation. Our results provide deep insight into understanding the mechanism of superconductivity in cuprate superconductors.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"35 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spin-orbit control of antiferromagnetic domains without a Zeeman coupling

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-11 DOI: 10.1038/s41535-025-00736-9

D. T. Maimone, J. Shen, N. Gauthier, D. G. Mazzone, M. Zolliker, R. Yadav, R. Sibille, D. J. Gawryluk, E. Pomjakushina, S. Raymond, E. Ressouche, C. Niedermayer, G. Lapertot, J. L. Gavilano, M. Bartkowiak, M. Kenzelmann

{"title":"Spin-orbit control of antiferromagnetic domains without a Zeeman coupling","authors":"D. T. Maimone, J. Shen, N. Gauthier, D. G. Mazzone, M. Zolliker, R. Yadav, R. Sibille, D. J. Gawryluk, E. Pomjakushina, S. Raymond, E. Ressouche, C. Niedermayer, G. Lapertot, J. L. Gavilano, M. Bartkowiak, M. Kenzelmann","doi":"10.1038/s41535-025-00736-9","DOIUrl":"https://doi.org/10.1038/s41535-025-00736-9","url":null,"abstract":"Encoding information in antiferromagnetic (AFM) domains is a promising solution for the ever growing demand in magnetic storage capacity. The absence of a macroscopic magnetization avoids crosstalk between different domain states, enabling ultrahigh density spintronics1 while being detrimental to the domain detection and manipulation. Disentangling these merits and disadvantages seemed so far unattainable. We report evidence for a new AFM domain selection mechanism based on non-Zeeman susceptibility anisotropy induced by the relative orientation of external magnetic fields to the k-domains. Consequently, the charge transport response is controlled by the rotation of the magnetic field and a pronounced anisotropic magnetoresistance is found in the AFM phase of bulk materials Nd1−xCex CoIn5. Our results and the domain switching theory2 indicate that this constitutes a new effect which might be universal across multiband materials. It provides a novel mechanism to control and detect AFM domains opening new perspectives for AFM sprintronics.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"16 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143393009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spin density wave in the bilayered nickelate La3Ni2O7−δ at ambient pressure

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-02-10 DOI: 10.1038/s41535-025-00740-z

Xiao-Sheng Ni, Yuyang Ji, Lixin He, Tao Xie, Dao-Xin Yao, Meng Wang, Kun Cao

{"title":"Spin density wave in the bilayered nickelate La3Ni2O7−δ at ambient pressure","authors":"Xiao-Sheng Ni, Yuyang Ji, Lixin He, Tao Xie, Dao-Xin Yao, Meng Wang, Kun Cao","doi":"10.1038/s41535-025-00740-z","DOIUrl":"https://doi.org/10.1038/s41535-025-00740-z","url":null,"abstract":"The recent discovery of high-temperature superconductivity in high-pressurized La3Ni2O7−δ has garnered significant attention. Using density functional theory, we investigate the magnetic properties of La3Ni2O7−δ at ambient pressure. Our calculations suggest that with δ = 0, the double spin stripe phase is favored as the magnetic ground state. Oxygen vacancies may effectively turn nearest Ni spins into charge sites. Consequently, with moderate δ values, our theoretical magnetic ground state exhibits characteristics of both double spin stripe and spin-charge stripe configurations, providing a natural explanation to reconcile the seemingly contradictory experimental findings that suggest both the configurations as candidates for the spin-density-wave phase. With higher δ values, we anticipate the ground state to become a spin-glass-like noncollinear magnetic phase with only short-range order. The oxygen vacancies are expected to significantly impact the magnetic excitations and the transition temperatures TSDW. Notably, the magnetic ordering also induces concomitant charge ordering and orbital ordering, driven by spin-lattice coupling under the low symmetry magnetic order. We further offer a plausible explanation for the experimental observations that the measured TSDW appears insensitive to the variation of samples and the lack of direct evidence for long-range magnetic ordering.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"8 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143375503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0