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+[
+  {
+    "title": "Zero-point energy of tensor fluctuations on the MPS manifold",
+    "authors": [
+      "Sebastian Leontica",
+      "Andrew G. Green"
+    ],
+    "abstract": "This work presents a method for studying low-energy physics in highly correlated magnetic systems using the matrix product state (MPS) manifold. We adapt the spin-wave approach, which has been very successful in modeling certain low-entanglement magnetic materials, to systems where the ground state is better represented by an MPS, such as the S = 1 Affleck-Kennedy-Lieb-Tasaki (AKLT) model. We argue that the quasi-local action of tensor fluctuations and the natural K\\\"ahler structure of the MPS manifold facilitate a description in terms of bosonic modes. We apply this approach to compute fluctuation corrections to the bilinear-biquadratic Heisenberg model, whose ground state we expect to be close to the exact bond dimension 2 AKLT state in a certain parameter range. Our results show significant improvements in energy approximations, highlighting both the qualitative and quantitative potential of this paradigm for studying complex entangled systems. This approach paves the way for new insights into the low-energy physics of correlated materials and the development of effective field theories beyond traditional semiclassical methods.",
+    "arxiv_id": "2410.22411v1",
+    "categories": [
+      "quant-ph",
+      "cond-mat.other"
+    ],
+    "primary_category": "quant-ph",
+    "published_date": "2024-10-29T18:00:02Z",
+    "updated_date": "2024-10-29T18:00:02Z",
+    "pdf_url": "https://arxiv.org/pdf/2410.22411v1",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2410.22411v1.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  },
+  {
+    "title": "Solid Solubility in Metallic Hydrogen",
+    "authors": [
+      "Jakkapat Seeyangnok",
+      "Udomsilp Pinsook",
+      "Graeme J Ackland"
+    ],
+    "abstract": "Hydrogen in its metallic form is the most common material in our solar system, found under the extreme pressure and temperature conditions found in giant planets. Such conditions are inaccessible to experiment and consequently, theoretical work has typically led experiment. Many remarkable properties are proposed for metallic hydrogen, which is expected to exist in solid form down to low temperatures. Relevant here is that solid metallic hydrogen is not expected to have a close-packed structure, even at extreme pressures. The predicted crystal structure has a packing fraction of only 0.44 compared with 0.74 for fcc. Alloying with other metallic elements can form compounds with atomic hydrogen and much reduced metallization pressure. Here, we investigate the possible solid solubility of a representative range of elements (Be, B, Mg, S, Fe, La) in metallic atomic hydrogen near 500GPa. Zero point energy is highly significant in all cases. The metallic elements Be, Mg, Fe, and La have a well-defined clathrate-style first neighbour shell at 300K, while the non-metallic B and S have more open arrangements. All the elements considered are soluble, in sites substituting for more than one hydrogen atom. The solid solubility of such a wide range of ambient bonding types: simple metals, covalent materials, transition metals, lanthanides, which gives a strong indication that most elements will dissolve in solid metallic hydrogen.",
+    "arxiv_id": "2410.20762v1",
+    "categories": [
+      "cond-mat.mtrl-sci",
+      "physics.chem-ph"
+    ],
+    "primary_category": "cond-mat.mtrl-sci",
+    "published_date": "2024-10-28T05:51:18Z",
+    "updated_date": "2024-10-28T05:51:18Z",
+    "pdf_url": "https://arxiv.org/pdf/2410.20762v1",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2410.20762v1.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  },
+  {
+    "title": "Ground state properties of the Heisenberg-compass model on the square   lattice",
+    "authors": [
+      "Subhankar Khatua",
+      "Griffin C. Howson",
+      "Michel J. P. Gingras",
+      "Jeffrey G. Rau"
+    ],
+    "abstract": "Compass models provide insights into the properties of Mott-insulating materials that host bond-dependent anisotropic interactions between their pseudospin degrees of freedom. In this article, we explore the classical and quantum ground state properties of one such model relevant to certain layered perovskite materials akin to Ba$_2$IrO$_4$ - namely, the Heisenberg-compass model on the square lattice. We first investigate the ground state phase diagram of this model using classical Monte Carlo simulations. These reveal that the low temperature classical phase diagram is divided into six different classes of long-range ordered phases, including four phases that exhibit an order by disorder selection and two phases that are stabilized energetically. This model admits a special duality transformation, known as the Klein duality, conveniently allowing to map one region of coupling parameters onto another and constraining the phase diagram, and which we exploit in our study. From the analysis of the zero-point energy and the free energy of the spin waves, we find that order by quantum disorder at zero temperature and order by thermal disorder select the same orderings as those found from classical Monte Carlo simulations. We further investigate the quantum ground states of this model using numerical exact diagonalization on small clusters by exploiting the translational symmetry of the square lattice. We obtain a ground state phase diagram bearing close resemblance to that found from the classical analysis.",
+    "arxiv_id": "2404.02196v2",
+    "categories": [
+      "cond-mat.str-el",
+      "cond-mat.stat-mech"
+    ],
+    "primary_category": "cond-mat.str-el",
+    "published_date": "2024-04-02T18:00:01Z",
+    "updated_date": "2024-10-18T20:38:00Z",
+    "pdf_url": "https://arxiv.org/pdf/2404.02196v2",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2404.02196v2.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  },
+  {
+    "title": "Topological bound on structure factor",
+    "authors": [
+      "Yugo Onishi",
+      "Liang Fu"
+    ],
+    "abstract": "We show that the static structure factor of general many-body systems with $U(1)$ symmetry has a lower bound determined only by the ground state Chern number. Our bound relies only on causality and non-negative energy dissipation, and holds for a wide range of systems. We apply our theory to (fractional) Chern insulators, (fractional) quantum spin Hall insulators, topological superconductors, and chiral spin liquids. Our results uncover a universal feature of topological phases beyond the quantized response.",
+    "arxiv_id": "2406.18654v2",
+    "categories": [
+      "cond-mat.str-el",
+      "cond-mat.mes-hall"
+    ],
+    "primary_category": "cond-mat.str-el",
+    "published_date": "2024-06-26T18:00:07Z",
+    "updated_date": "2024-10-15T19:02:19Z",
+    "pdf_url": "https://arxiv.org/pdf/2406.18654v2",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2406.18654v2.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  },
+  {
+    "title": "Two dark components of de Sitter Universe",
+    "authors": [
+      "G. E. Volovik"
+    ],
+    "abstract": "The de Sitter vacuum serves as the thermal bath for matter with local temperature, which is twice the Gibbons-Hawking temperature related to the cosmological horizon. This local temperature leads to the heating of matter. Here do not consider the real matter, but only the component which is related to the gravitational degrees of freedom and participates the thermodynamics of the de Sitter state. This gravitational component behaves as Zel'dovich stiff matter. The vacuum energy and the analog of the Zel'dovich stiff matter represent correspondingly the dark energy and dark matter. In equilibrium the positive partial pressure of dark matter compensates the negative partial pressure of quantum vacuum. That is why in the full equilibrium the total pressure is zero. This is rather similar to the correspondingly superfluid and normal components of superfluid liquid, which together produce the zero pressure of the liquid in the absence of environment. We extend this two dark components approach and the suggest the phenomenological theory, which describes the dynamics of the dark energy and the dark matter. For that we assume that the in dynamics, the gravitational dark matter also behaves as the real Zel'dovich stiff matter. In this phenomenological model, both components experience the power law decay due to the energy exchange between these components. Then it follows that their values at present time have the correct order of magnitude. How this phenomenology is supported by the microscopic physics is an open question.",
+    "arxiv_id": "2410.04392v2",
+    "categories": [
+      "gr-qc",
+      "cond-mat.other",
+      "hep-ph"
+    ],
+    "primary_category": "gr-qc",
+    "published_date": "2024-10-06T08:12:39Z",
+    "updated_date": "2024-10-10T13:08:32Z",
+    "pdf_url": "https://arxiv.org/pdf/2410.04392v2",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2410.04392v2.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  },
+  {
+    "title": "Topological and Magnetic Properties of a Non-collinear Spin State on a   Honeycomb Lattice in a Magnetic Field",
+    "authors": [
+      "Randy S. Fishman",
+      "Daniel M. Pajerowski"
+    ],
+    "abstract": "We study the Berry curvature and Chern number of a non-collinear spin state on a honeycomb lattice that evolves from coplanar to ferromagnetic with a magnetic field applied along the $z$ axis. The coplanar state is stabilized by nearest-neighbor ferromagnetic interactions, single-ion anisotropy along $z$, and Dzyalloshinskii-Moriya interactions between next-nearest neighbor sites. Below the critical field $H_c$ that aligns the spins, the magnetic unit cell contains $M=6$ sites and the spin dynamics contains six magnon subbands. Although the classical energy is degenerate wrt the twist angle $\\phi $ between nearest-neighbor spins, the dependence of the free energy on $\\phi $ at low temperatures is dominated by the magnon zero-point energy, which contains extremum at $\\phi =\\pi l/3$ for integer $l$. The only unique ground states GS($\\phi )$ have $l=0$ or 1. For $H < H_c'$, the zero-point energy has minima at even $l$ and the ground state is GS(0). For $H_c' < H < H_c$, the zero-point energy has minima at odd $l$ and the ground state is GS($\\pi/3$). In GS(0), the magnon density-of-states exhibits five distinct phases with increasing field associated with the opening and closing of energy gaps between the two or three magnonic bands, each containing between 1 and 4 four magnon subbands. While the Berry curvature vanishes for the coplanar $\\phi=0$ phase in zero field, the Berry curvature and Chern numbers exhibit signatures of the five phases at nonzero fields below $H_c'$. If $\\phi \\ne \\pi l/3$, the Chern numbers of the two or three magnonic bands are non-integer. We also evaluate the inelastic neutron-scattering spectrum $S(\\vk ,\\omega )$ produced by the six magnon subbands in all five phases of GS(0) and in GS($\\pi/3$).",
+    "arxiv_id": "2409.07319v1",
+    "categories": [
+      "cond-mat.mtrl-sci"
+    ],
+    "primary_category": "cond-mat.mtrl-sci",
+    "published_date": "2024-09-11T14:57:23Z",
+    "updated_date": "2024-09-11T14:57:23Z",
+    "pdf_url": "https://arxiv.org/pdf/2409.07319v1",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2409.07319v1.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  },
+  {
+    "title": "Metallic bonding in close packed structures: structural frustration from   a hidden gauge symmetry",
+    "authors": [
+      "Eric He",
+      "C. M. Wilson",
+      "R. Ganesh"
+    ],
+    "abstract": "Based on its simple valence electron configuration, we may expect lithium to have straightforward physical properties that are easily explained. However, solid lithium, when cooled below 77 K, develops a complex structure that has been debated for decades. A close parallel is found in sodium below 36 K where the crystal structure still remains unresolved. In this letter, we explore a possible driving force behind this complexity. We begin with the observation that Li and Na form close-packed structures at low temperatures. We demonstrate a gauge symmetry that forces \\textit{all} close-packed structures to have the same electronic energy and, in fact, the very same band structure. This symmetry requires two conditions: (a) bands must arise from $s$ orbitals, and (b) hoppings beyond second-nearest neighbours must be negligible. We argue that both can be reasonably invoked in Li and Na. When these conditions are satisfied, we have extensive degeneracy with the number of competing iso-energetic structures growing exponentially with linear system size. Weak effects, such as $p$-orbital admixture, long-range hopping and phonon zero-point energy, can break this symmetry. These can play a decisive role in `selecting' one particular ordered structure. This point of view may explain the occurrence of ordered structures in Li and Na under pressure. Our results suggest that martensitic transitions may also occur in heavier alkali metals such as potassium.",
+    "arxiv_id": "2405.15865v1",
+    "categories": [
+      "cond-mat.str-el"
+    ],
+    "primary_category": "cond-mat.str-el",
+    "published_date": "2024-05-24T18:23:43Z",
+    "updated_date": "2024-05-24T18:23:43Z",
+    "pdf_url": "https://arxiv.org/pdf/2405.15865v1",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2405.15865v1.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  },
+  {
+    "title": "Ground state wave functions for the quantum Hall effect on a sphere and   the Atiyah-Singer index theorem",
+    "authors": [
+      "Brian P. Dolan",
+      "Aonghus Hunter-McCabe"
+    ],
+    "abstract": "The quantum Hall effect is studied in a spherical geometry using the Dirac operator for non-interacting fermions in a background magnetic field, which is supplied by a Wu-Yang magnetic monopole at the centre of the sphere. Wave functions are cross-section of a non-trivial $U(1)$ bundle, the zero point energy then vanishes and no perturbations can lower the energy. The Atiyah-Singer index theorem constrains the degeneracy of the ground state.   The fractional quantum Hall effect is also studied in the composite Fermion model. Vortices of the statistical gauge field are supplied by Dirac strings associated with the monopole field. A unique ground state is attained only if the vortices have an even number of flux units and act to counteract the background field, reducing the effective field seen by the composite fermions. There is a unique gapped ground state and, for large particle numbers, fractions $\\nu=\\frac{1}{2 k+1}$ are recovered.",
+    "arxiv_id": "2001.02208v3",
+    "categories": [
+      "hep-th",
+      "cond-mat.str-el"
+    ],
+    "primary_category": "hep-th",
+    "published_date": "2020-01-07T18:20:44Z",
+    "updated_date": "2024-02-17T13:14:52Z",
+    "pdf_url": "https://arxiv.org/pdf/2001.02208v3",
+    "local_pdf_path": "data\\arxiv\\pdfs\\materials\\2001.02208v3.pdf",
+    "comment": "",
+    "journal_ref": "",
+    "doi": ""
+  }
+]