The unfilled skutterudite hosts extremely large magnetoresistance (∼2 × at 30 T and 2 K), large hole mobility (∼2 × , 2 K), and a fourfold quadratic contact point (QCP) above the Fermi level in the electronic structure. We unveil herein that the partial filling of Eu onto the icosahedral void sites of can shift the QCP to lie below the Fermi level while retaining the high carrier mobility (∼1.6 × , 2 K). Unlike nonmagnetic , partially filled skutterudite is a soft ferromagnet with almost isotropic magnetism. Additionally, an intriguing topological Hall effect is observed, likely hinting an unusual spin texture. In this paper, we provide useful insights into the interplay between magnetism and the nontrivial feature of the electronic band structure, which would guide more efforts in studying this issue.
未填充的矽卡岩 CoP3 具有极高的磁阻（在 30 T 和 2 K 条件下为 2 × 104%）、极高的空穴迁移率（在 2 K 条件下为 2 × 104 cm2V-1s-1）以及高于费米级的四倍二次接触点（QCP）。我们在此揭示，在 CoP3 的二十面体空位上部分填充 Eu 可以将 QCP 移至费米水平以下，同时保持高载流子迁移率（∼1.6 × 104 cm2V-1s-1，2 K）。与非磁性 CoP3 不同，部分填充的沸石 Eu0.412Co4P12 是一种软铁磁体，具有几乎各向同性的磁性。此外，我们还观察到一种有趣的拓扑霍尔效应，这可能暗示了一种不寻常的自旋纹理。在本文中，我们就磁性与电子带结构的非偶性特征之间的相互作用提出了有益的见解，这将为研究这一问题提供更多的指导。
{"title":"Effects of partial Eu filling in the unfilled skutterudite CoP3","authors":"Zicheng Tao, Chao Zhang, Jian Yuan, Renjie Zhang, Xia Wang, Zhenhai Yu, Wei Xia, Yaobo Huang, Shihao Zhang, Yanfeng Guo","doi":"10.1103/physrevb.110.035156","DOIUrl":"https://doi.org/10.1103/physrevb.110.035156","url":null,"abstract":"The unfilled skutterudite <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Co</mi><msub><mi mathvariant=\"normal\">P</mi><mn>3</mn></msub></mrow></math> hosts extremely large magnetoresistance (∼2 × <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mrow><mn>10</mn></mrow><mn>4</mn></msup><mo>%</mo></mrow></math> at 30 T and 2 K), large hole mobility (∼2 × <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mn>10</mn></mrow><mn>4</mn></msup><mo> </mo><mrow><mi mathvariant=\"normal\">c</mi><msup><mrow><mi mathvariant=\"normal\">m</mi></mrow><mn>2</mn></msup><mspace width=\"0.16em\"></mspace><msup><mrow><mi mathvariant=\"normal\">V</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mspace width=\"0.16em\"></mspace><msup><mrow><mi mathvariant=\"normal\">s</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math>, 2 K), and a fourfold quadratic contact point (QCP) above the Fermi level in the electronic structure. We unveil herein that the partial filling of Eu onto the icosahedral void sites of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Co</mi><msub><mi mathvariant=\"normal\">P</mi><mn>3</mn></msub></mrow></math> can shift the QCP to lie below the Fermi level while retaining the high carrier mobility (∼1.6 × <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mn>10</mn></mrow><mn>4</mn></msup><mo> </mo><mrow><mi mathvariant=\"normal\">c</mi><msup><mrow><mi mathvariant=\"normal\">m</mi></mrow><mn>2</mn></msup><mspace width=\"0.16em\"></mspace><msup><mrow><mi mathvariant=\"normal\">V</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mspace width=\"0.16em\"></mspace><msup><mrow><mi mathvariant=\"normal\">s</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math>, 2 K). Unlike nonmagnetic <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Co</mi><msub><mi mathvariant=\"normal\">P</mi><mn>3</mn></msub></mrow></math>, partially filled skutterudite <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi mathvariant=\"normal\">Eu</mi><mrow><mn>0.412</mn></mrow></msub><msub><mi mathvariant=\"normal\">Co</mi><mn>4</mn></msub><msub><mi mathvariant=\"normal\">P</mi><mn>12</mn></msub></mrow></math> is a soft ferromagnet with almost isotropic magnetism. Additionally, an intriguing topological Hall effect is observed, likely hinting an unusual spin texture. In this paper, we provide useful insights into the interplay between magnetism and the nontrivial feature of the electronic band structure, which would guide more efforts in studying this issue.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.014517
D. Yu. Vodolazov
It is theoretically found that in-plane vortices may exist in a thin normal metal (N) layer (with thickness much smaller than the coherence length ) that covers a superconductor (S). Vortices enter the N layer with proximity-induced superconductivity at a sufficiently large in-plane magnetic field. These vorticies have squeezed cores and are located (pinned) near the SN interface. At large magnetic fields, we find a nascent vortex state, which is a spatially modulated state along the finite length N layer with zero vorticity. This state does not exist in a finite length single S layer.
理论发现，在覆盖超导体（S）的普通金属（N）薄层（厚度 dN 远远小于相干长度ξN）中可能存在面内涡流。在足够大的面内磁场下，涡流进入 N 层，并具有近似诱导超导性。这些旋涡具有挤压核心，位于 SN 接口附近（被钉住）。在大磁场下，我们会发现一种新生涡旋态，它是沿有限长度 N 层的空间调制态，涡度为零。这种状态并不存在于有限长度的单 S 层中。
{"title":"Squeezed and nascent vortices in a thin normal layer with proximity induced superconductivity","authors":"D. Yu. Vodolazov","doi":"10.1103/physrevb.110.014517","DOIUrl":"https://doi.org/10.1103/physrevb.110.014517","url":null,"abstract":"It is theoretically found that in-plane vortices may exist in a thin normal metal (N) layer (with thickness <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>d</mi><mi>N</mi></msub></math> much smaller than the coherence length <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>ξ</mi><mi>N</mi></msub></math>) that covers a superconductor (S). Vortices enter the N layer with proximity-induced superconductivity at a sufficiently large in-plane magnetic field. These vorticies have squeezed cores and are located (pinned) near the SN interface. At large magnetic fields, we find a nascent vortex state, which is a spatially modulated state along the finite length N layer with zero vorticity. This state does not exist in a finite length single S layer.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.024518
Joseph J. Cuozzo, Enrico Rossi
In graphene, the approximate SU(4) symmetry associated with the spin and valley degrees of freedom in the quantum Hall (QH) regime is reflected in the fourfold degeneracy of graphene's Landau levels (LLs). Interactions and the Zeeman effect break such approximate symmetry and lift the corresponding degeneracy of the LLs. We study how the breaking of the approximate SU(4) symmetry affects the properties of graphene's QH edge modes located in proximity to a superconductor. We show how the lifting of the fourfold degeneracy qualitatively modifies the transport properties of the QH-superconductor heterojunction. For the zero LL, by placing the edge modes in proximity to a superconductor, it is, in principle, possible to realize a 1D topological superconductor supporting Majoranas in the presence of sufficiently strong Zeeman field. We estimate the topological gap of such a topological superconductor and relate it to the properties of the QH-superconductor interface.
{"title":"SU(4) symmetry breaking and induced superconductivity in graphene quantum Hall edges","authors":"Joseph J. Cuozzo, Enrico Rossi","doi":"10.1103/physrevb.110.024518","DOIUrl":"https://doi.org/10.1103/physrevb.110.024518","url":null,"abstract":"In graphene, the approximate SU(4) symmetry associated with the spin and valley degrees of freedom in the quantum Hall (QH) regime is reflected in the fourfold degeneracy of graphene's Landau levels (LLs). Interactions and the Zeeman effect break such approximate symmetry and lift the corresponding degeneracy of the LLs. We study how the breaking of the approximate SU(4) symmetry affects the properties of graphene's QH edge modes located in proximity to a superconductor. We show how the lifting of the fourfold degeneracy qualitatively modifies the transport properties of the QH-superconductor heterojunction. For the zero LL, by placing the edge modes in proximity to a superconductor, it is, in principle, possible to realize a 1D topological superconductor supporting Majoranas in the presence of sufficiently strong Zeeman field. We estimate the topological gap of such a topological superconductor and relate it to the properties of the QH-superconductor interface.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.014436
A. Ciechan, P. Dłużewski, S. Kret, K. Gas, L. Scheffler, C. Gould, J. Kleinlein, M. Sawicki, L. W. Molenkamp, P. Bogusławski
High-resolution transmission electron microscopy and superconducting quantum interference device magnetometry shows that epitaxial CuMnSb films exhibit a coexistence of two magnetic phases, coherently intertwined in nanometric scales. The dominant phase is half-Heusler cubic antiferromagnet with the Néel temperature of 62 K, the equilibrium structure of bulk CuMnSb. The secondary phase is its ferromagnetic tetragonal polymorph with the Curie temperature of about 100 K. First principles calculations provide a consistent interpretation of experiment, since (i) total energy of is higher than that of only by 0.12 eV per formula unit, which allows for epitaxial stabilization of this phase, (ii) the metallic character of favors the Ruderman-Kittel-Kasuya-Yoshida ferromagnetic coupling, and (iii) the calculated effective Curie-Weiss magnetic moment of Mn ions in both phases is about , favorably close to the measured value. Calculated properties of all point native defects indicate that the most likely to occur are antisites. They affect magnetic properties of epilayers, but they cannot induce the ferromagnetic order in CuMnSb. Combined, the findings highlight a practical route towards fabrication of functional materials in which coexisting polymorphs provide complementing functionalities in one host.
{"title":"Coexistence of antiferromagnetic cubic and ferromagnetic tetragonal polymorphs in epitaxial CuMnSb films","authors":"A. Ciechan, P. Dłużewski, S. Kret, K. Gas, L. Scheffler, C. Gould, J. Kleinlein, M. Sawicki, L. W. Molenkamp, P. Bogusławski","doi":"10.1103/physrevb.110.014436","DOIUrl":"https://doi.org/10.1103/physrevb.110.014436","url":null,"abstract":"High-resolution transmission electron microscopy and superconducting quantum interference device magnetometry shows that epitaxial CuMnSb films exhibit a coexistence of two magnetic phases, coherently intertwined in nanometric scales. The dominant <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math> phase is half-Heusler cubic antiferromagnet with the Néel temperature of 62 K, the equilibrium structure of bulk CuMnSb. The secondary phase is its ferromagnetic tetragonal <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math> polymorph with the Curie temperature of about 100 K. First principles calculations provide a consistent interpretation of experiment, since (i) total energy of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi><mo>–</mo><mi>CuMnSb</mi></math> is higher than that of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi><mo>–</mo><mi>CuMnSb</mi></math> only by 0.12 eV per formula unit, which allows for epitaxial stabilization of this phase, (ii) the metallic character of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi><mo>–</mo><mi>CuMnSb</mi></math> favors the Ruderman-Kittel-Kasuya-Yoshida ferromagnetic coupling, and (iii) the calculated effective Curie-Weiss magnetic moment of Mn ions in both phases is about <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>5.5</mn><mspace width=\"0.16em\"></mspace><msub><mi>μ</mi><mi mathvariant=\"normal\">B</mi></msub></mrow></math>, favorably close to the measured value. Calculated properties of all point native defects indicate that the most likely to occur are <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>Mn</mi><mi>Cu</mi></msub></math> antisites. They affect magnetic properties of epilayers, but they cannot induce the ferromagnetic order in CuMnSb. Combined, the findings highlight a practical route towards fabrication of functional materials in which coexisting polymorphs provide complementing functionalities in one host.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
The spin-1 triangular lattice Heisenberg antiferromagnet and its sister compounds are conjectured to promote the formation of many-body quantum entangled states such as a quantum spin liquid (QSL), an exotic phase which features fractionalized quasiparticle excitations and emergent gauges. We probe the single crystal of using an in-depth Raman spectroscopic technique. Our measurements provide evidence for the fractionalized excitations, suggesting that the current system is in close proximity to the QSL phase. This is also in line with the proposed higher-order fractional magnetization plateau in this system, as these plateaus have an intricate relationship with the spin entanglement. We observed unconventional underlying scattering as a broad continuum with an intensity that shows fermionic statistics. Additionally, phonon modes show Fano asymmetry, also conjectured as a fingerprint of the spin-liquid phase, and above a critical Raman shift also show fermionic statistics in their intensity evolution.
{"title":"Quasi-two-dimensional frustrated spin-1 triangular lattice antiferromagnet Ca3NiNb2O9: A proximate spin liquid","authors":"Sonia Deswal, Deepu Kumar, Dibyata Rout, Surjeet Singh, Pradeep Kumar","doi":"10.1103/physrevb.110.024430","DOIUrl":"https://doi.org/10.1103/physrevb.110.024430","url":null,"abstract":"The spin-1 triangular lattice Heisenberg antiferromagnet <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">C</mi><msub><mi mathvariant=\"normal\">a</mi><mn>3</mn></msub><mi>NiN</mi><msub><mi mathvariant=\"normal\">b</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>9</mn></msub></mrow></math> and its sister compounds are conjectured to promote the formation of many-body quantum entangled states such as a quantum spin liquid (QSL), an exotic phase which features fractionalized quasiparticle excitations and emergent gauges. We probe the single crystal of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">C</mi><msub><mi mathvariant=\"normal\">a</mi><mn>3</mn></msub><mi>NiN</mi><msub><mi mathvariant=\"normal\">b</mi><mn>2</mn></msub><msub><mi mathvariant=\"normal\">O</mi><mn>9</mn></msub></mrow></math> using an in-depth Raman spectroscopic technique. Our measurements provide evidence for the fractionalized excitations, suggesting that the current system is in close proximity to the QSL phase. This is also in line with the proposed higher-order fractional magnetization plateau in this system, as these plateaus have an intricate relationship with the spin entanglement. We observed unconventional underlying scattering as a broad continuum with an intensity that shows fermionic statistics. Additionally, phonon modes show Fano asymmetry, also conjectured as a fingerprint of the spin-liquid phase, and above a critical Raman shift also show fermionic statistics in their intensity evolution.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.024517
P. Vallet, J. Cayssol
The Anderson-Higgs mode in a superconductor corresponds to a collective and coherent oscillation of the order parameter amplitude. We propose to detect this mode in a tunnel Josephson junction between two singlet -wave diffusive superconductors in presence of a THz external irradiation at angular frequency . By solving the Keldysh-Usadel equations, we obtain that the current-voltage relation exhibits a series of peaks of which only a subset is enhanced by the Anderson-Higgs mode. Furthermore, at zero bias, the junction features an ac current oscillating at , which is resonant when hits the superconducting gap, thereby indicating the activation of the Anderson-Higgs mode.
{"title":"Anderson-Higgs amplitude mode in Josephson junctions","authors":"P. Vallet, J. Cayssol","doi":"10.1103/physrevb.110.024517","DOIUrl":"https://doi.org/10.1103/physrevb.110.024517","url":null,"abstract":"The Anderson-Higgs mode in a superconductor corresponds to a collective and coherent oscillation of the order parameter amplitude. We propose to detect this mode in a tunnel Josephson junction between two singlet <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi></math>-wave diffusive superconductors in presence of a THz external irradiation at angular frequency <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>ω</mi></math>. By solving the Keldysh-Usadel equations, we obtain that the current-voltage relation exhibits a series of peaks of which only a subset is enhanced by the Anderson-Higgs mode. Furthermore, at zero bias, the junction features an ac current oscillating at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>2</mn><mi>ω</mi></mrow></math>, which is resonant when <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>ℏ</mi><mi>ω</mi></mrow></math> hits the superconducting gap, thereby indicating the activation of the Anderson-Higgs mode.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.045440
Liang Mao, Xuanpu Yang, Ming-Jie Tao, Haiping Hu, Lei Pan
The non-Hermitian skin effect, in which eigenstates of non-Hermitian Hamiltonians are localized at one boundary in the open boundary condition, has attracted great interest recently. In this paper, we investigate the skin effect in one-dimensional dissipative quantum many-body systems, which we call the Liouvillian skin effect (LSE). We rigorously identify the existence of the LSE for generalized boundary conditions by solving the Liouvillian superoperator of an exactly solvable model with the advantage of the Bethe ansatz. The LSE is sensitive to boundary conditions where the signature is reflected in eigenfunctions of the system. We confirm that the LSE is fragile to a tiny coflow boundary hopping with non-Hermitian current but can survive a counterflow boundary hopping in the thermodynamic limit. Our work provides a prototypical example of exactly solvable dissipative quantum many-body lattice systems exhibiting the LSE for generalized boundary conditions. It can be further extended to other integrable open quantum many-body models.
{"title":"Liouvillian skin effect in a one-dimensional open many-body quantum system with generalized boundary conditions","authors":"Liang Mao, Xuanpu Yang, Ming-Jie Tao, Haiping Hu, Lei Pan","doi":"10.1103/physrevb.110.045440","DOIUrl":"https://doi.org/10.1103/physrevb.110.045440","url":null,"abstract":"The non-Hermitian skin effect, in which eigenstates of non-Hermitian Hamiltonians are localized at one boundary in the open boundary condition, has attracted great interest recently. In this paper, we investigate the skin effect in one-dimensional dissipative quantum many-body systems, which we call the Liouvillian skin effect (LSE). We rigorously identify the existence of the LSE for generalized boundary conditions by solving the Liouvillian superoperator of an exactly solvable model with the advantage of the Bethe ansatz. The LSE is sensitive to boundary conditions where the signature is reflected in eigenfunctions of the system. We confirm that the LSE is fragile to a tiny coflow boundary hopping with non-Hermitian current but can survive a counterflow boundary hopping in the thermodynamic limit. Our work provides a prototypical example of exactly solvable dissipative quantum many-body lattice systems exhibiting the LSE for generalized boundary conditions. It can be further extended to other integrable open quantum many-body models.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.014111
Saif Siddique, James L. Hart, Drake Niedzielski, Ratnadwip Singha, Myung-Geun Han, Stephen D. Funni, Michael Colletta, Mehrdad T. Kiani, Noah Schnitzer, Natalie L. Williams, Lena F. Kourkoutis, Yimei Zhu, Leslie M. Schoop, Tomás A. Arias, Judy J. Cha
The rare-earth tritellurides have a rich phase diagram that includes charge density waves (CDWs), superconductivity, and magnetic order, offering a platform to study the interplay between these phases on a square-net system. Prior studies have shown that defects can affect the CDW characteristics in these materials, yet coupling between the CDW order and the underlying microstructure has not been studied at the nanoscale. Here we use scanning transmission electron microscopy at cryogenic temperatures to directly visualize the effects of defects on the CDW order and provide a spatially resolved microscopic correlation between the CDW transition and structural defects. We show that in the presence of extended defects, such as dislocations and stacking faults, the weak orthorhombicity of the rare-earth tritellurides is lost and the material becomes pseudotetragonal. Since the orthorhombicity acts as a symmetry breaking field for the CDW transitions in rare-earth tritellurides, the presence of these extended defects modulates the energetics of the CDWs and suppresses the ground-state CDW phase at low temperature.
{"title":"Realignment and suppression of charge density waves in the rare-earth tritellurides RTe3 (R=La, Gd, Er)","authors":"Saif Siddique, James L. Hart, Drake Niedzielski, Ratnadwip Singha, Myung-Geun Han, Stephen D. Funni, Michael Colletta, Mehrdad T. Kiani, Noah Schnitzer, Natalie L. Williams, Lena F. Kourkoutis, Yimei Zhu, Leslie M. Schoop, Tomás A. Arias, Judy J. Cha","doi":"10.1103/physrevb.110.014111","DOIUrl":"https://doi.org/10.1103/physrevb.110.014111","url":null,"abstract":"The rare-earth tritellurides have a rich phase diagram that includes charge density waves (CDWs), superconductivity, and magnetic order, offering a platform to study the interplay between these phases on a square-net system. Prior studies have shown that defects can affect the CDW characteristics in these materials, yet coupling between the CDW order and the underlying microstructure has not been studied at the nanoscale. Here we use scanning transmission electron microscopy at cryogenic temperatures to directly visualize the effects of defects on the CDW order and provide a spatially resolved microscopic correlation between the CDW transition and structural defects. We show that in the presence of extended defects, such as dislocations and stacking faults, the weak orthorhombicity of the rare-earth tritellurides is lost and the material becomes pseudotetragonal. Since the orthorhombicity acts as a symmetry breaking field for the CDW transitions in rare-earth tritellurides, the presence of these extended defects modulates the energetics of the CDWs and suppresses the ground-state CDW phase at low temperature.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.045146
Hiromi Ebisu
We study entanglement entropy of unusual topological stabilizer codes which admit fractional excitations with restricted mobility constraint in a manner akin to fracton topological phases. It is widely known that the subleading term of the entanglement entropy of a disk geometry in conventional topologically ordered phases is related to the total number of the quantum dimension of the fractional excitations. We show that, in our model, such a relation does not hold, i.e., the total number of the quantum dimension varies depending on the system size, whereas the subleading term of the entanglement entropy takes a constant number irrespective to the system size. We give a physical interpretation of this result in the simplest case of the model. More thorough analysis on the entanglement entropy of the model on generic lattices is also presented.
{"title":"Entanglement entropy of topological phases with multipole symmetry","authors":"Hiromi Ebisu","doi":"10.1103/physrevb.110.045146","DOIUrl":"https://doi.org/10.1103/physrevb.110.045146","url":null,"abstract":"We study entanglement entropy of unusual <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi mathvariant=\"double-struck\">Z</mi><mi>N</mi></msub></math> topological stabilizer codes which admit fractional excitations with restricted mobility constraint in a manner akin to fracton topological phases. It is widely known that the subleading term of the entanglement entropy of a disk geometry in conventional topologically ordered phases is related to the total number of the quantum dimension of the fractional excitations. We show that, in our model, such a relation does not hold, i.e., the total number of the quantum dimension varies depending on the system size, whereas the subleading term of the entanglement entropy takes a constant number irrespective to the system size. We give a physical interpretation of this result in the simplest case of the model. More thorough analysis on the entanglement entropy of the model on generic lattices is also presented.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Pub Date : 2024-07-25DOI: 10.1103/physrevb.110.024428
Xiaolin Zhang, Lei Yin, Sicong Zhu, Ruiqing Cheng, Yao Wen, Jun He
Multiferroic tunneling junctions (MFTJs), which comprise magnetic electrodes and extremely thin ferroelectric tunneling barriers, are promising contenders for nonvolatile memory applications. Noncollinear antiferromagnetic with time-reversal symmetry-breaking polarization properties and ferroelectric may open up the possibility of constructing room-temperature MFTJs. In this study, we investigate the spin-correlation transport in the MFTJs with structure using first-principles calculations. The resistance in this structure can be manipulated by tuning the directions of both the Néel vector of and the electric polarization of the layer. Thus, multiple tunneling resistive states can be realized. We predict that huge tunneling magnetoresistance up to 6650% can be obtained by switching the magnetically oriented Néel vectors of , and more than 8000% tunneling electrical resistance can be obtained by controlling the ferroelectric structure of . Our work underscores the potential applications of in multiferroic nonvolatile memories and lays the foundation for the development of ultrafast and efficient spintronic devices utilizing antiferromagnets.
{"title":"Spin-correlation transport and multiple resistive states in multiferroic tunnel junctions","authors":"Xiaolin Zhang, Lei Yin, Sicong Zhu, Ruiqing Cheng, Yao Wen, Jun He","doi":"10.1103/physrevb.110.024428","DOIUrl":"https://doi.org/10.1103/physrevb.110.024428","url":null,"abstract":"Multiferroic tunneling junctions (MFTJs), which comprise magnetic electrodes and extremely thin ferroelectric tunneling barriers, are promising contenders for nonvolatile memory applications. Noncollinear antiferromagnetic <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>Mn</mi><mn>3</mn></msub><mi>Sn</mi></mrow></math> with time-reversal symmetry-breaking polarization properties and ferroelectric <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mtext>−</mtext><msub><mi>In</mi><mn>2</mn></msub><msub><mi>Se</mi><mn>3</mn></msub></mrow></math> may open up the possibility of constructing room-temperature MFTJs. In this study, we investigate the spin-correlation transport in the MFTJs with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>Mn</mi><mn>3</mn></msub><mi>Sn</mi><mo>/</mo><mi>BN</mi><mo>/</mo><mi>α</mi><mtext>−</mtext><msub><mi>In</mi><mn>2</mn></msub><msub><mi>Se</mi><mn>3</mn></msub></mrow><mo>/</mo><mrow><msub><mi>Mn</mi><mn>3</mn></msub><mi>Sn</mi></mrow></math> structure using first-principles calculations. The resistance in this structure can be manipulated by tuning the directions of both the Néel vector of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>Mn</mi><mn>3</mn></msub><mi>Sn</mi></mrow></math> and the electric polarization of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mtext>−</mtext><msub><mi>In</mi><mn>2</mn></msub><msub><mi>Se</mi><mn>3</mn></msub></mrow></math> layer. Thus, multiple tunneling resistive states can be realized. We predict that huge tunneling magnetoresistance up to 6650% can be obtained by switching the magnetically oriented Néel vectors of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>Mn</mi><mn>3</mn></msub><mi>Sn</mi></mrow></math>, and more than 8000% tunneling electrical resistance can be obtained by controlling the ferroelectric structure of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mtext>−</mtext><msub><mi>In</mi><mn>2</mn></msub><msub><mi>Se</mi><mn>3</mn></msub></mrow></math>. Our work underscores the potential applications of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>Mn</mi><mn>3</mn></msub><mi>Sn</mi></mrow></math> in multiferroic nonvolatile memories and lays the foundation for the development of ultrafast and efficient spintronic devices utilizing antiferromagnets.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
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