1
|
Frey NC, Horton MK, Munro JM, Griffin SM, Persson KA, Shenoy VB. High-throughput search for magnetic and topological order in transition metal oxides. SCIENCE ADVANCES 2020; 6:6/50/eabd1076. [PMID: 33298446 PMCID: PMC7725452 DOI: 10.1126/sciadv.abd1076] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 10/26/2020] [Indexed: 05/25/2023]
Abstract
The discovery of intrinsic magnetic topological order in MnBi2Te4 has invigorated the search for materials with coexisting magnetic and topological phases. These multiorder quantum materials are expected to exhibit new topological phases that can be tuned with magnetic fields, but the search for such materials is stymied by difficulties in predicting magnetic structure and stability. Here, we compute more than 27,000 unique magnetic orderings for more than 3000 transition metal oxides in the Materials Project database to determine their magnetic ground states and estimate their effective exchange parameters and critical temperatures. We perform a high-throughput band topology analysis of centrosymmetric magnetic materials, calculate topological invariants, and identify 18 new candidate ferromagnetic topological semimetals, axion insulators, and antiferromagnetic topological insulators. To accelerate future efforts, machine learning classifiers are trained to predict both magnetic ground states and magnetic topological order without requiring first-principles calculations.
Collapse
Affiliation(s)
- Nathan C Frey
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
- Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Matthew K Horton
- Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94704, USA
| | - Jason M Munro
- Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Sinéad M Griffin
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Kristin A Persson
- Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94704, USA
| | - Vivek B Shenoy
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
| |
Collapse
|
2
|
Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system. Nat Commun 2014; 5:5112. [PMID: 25290587 DOI: 10.1038/ncomms6112] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 09/02/2014] [Indexed: 11/08/2022] Open
Abstract
The non-equilibrium approach to correlated electron systems is often based on the paradigm that different degrees of freedom interact on different timescales. In this context, photo-excitation is treated as an impulsive injection of electronic energy that is transferred to other degrees of freedom only at later times. Here, by studying the ultrafast dynamics of quasi-particles in an archetypal strongly correlated charge-transfer insulator (La2CuO(4+δ)), we show that the interaction between electrons and bosons manifests itself directly in the photo-excitation processes of a correlated material. With the aid of a general theoretical framework (Hubbard-Holstein Hamiltonian), we reveal that sub-gap excitation pilots the formation of itinerant quasi-particles, which are suddenly dressed by an ultrafast reaction of the bosonic field.
Collapse
|
4
|
Windt M, Grüninger M, Nunner T, Knetter C, Schmidt KP, Uhrig GS, Kopp T, Freimuth A, Ammerahl U, Büchner B, Revcolevschi A. Observation of two-magnon bound states in the two-leg ladders of (Ca,La)(14)Cu(24)O(41). PHYSICAL REVIEW LETTERS 2001; 87:127002. [PMID: 11580541 DOI: 10.1103/physrevlett.87.127002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2001] [Indexed: 05/23/2023]
Abstract
Phonon-assisted two-magnon absorption is studied in the spin- 1/2 two-leg ladders of (Ca,La)(14)Cu(24)O(41) for E parallel c (legs) and E parallel a (rungs). We verify the theoretically predicted existence of two-magnon singlet bound states, which give rise to peaks at approximately equal to 2140 and 2800 cm(-1). The two-magnon continuum is observed at approximately equal to 4000 cm(-1). Two different theoretical approaches (Jordan-Wigner fermions and perturbation theory) describe the data very well for J parallel approximately equal to 1020-1100 cm(-1), J parallel/J perpendicular approximately equal to 1-1.2. At high energies, the magnetic contribution to sigma(omega) is strikingly similar in the ladders and in the undoped high-T(c) cuprates, which emphasizes the importance of strong quantum fluctuations in the latter.
Collapse
Affiliation(s)
- M Windt
- II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Zibold A, Liu HL, Moore SW, Graybeal JM, Tanner DB. Optical properties of single-crystal Sr2CuO2Cl2. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:11734-11743. [PMID: 9982798 DOI: 10.1103/physrevb.53.11734] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|