Jian Rui Soh
I am a post-doctoral researcher in the LQM of EPFL. My research interests are in condensed matter systems where (i) non-trivial topology co-exists with magnetic order and (ii) novel order parameters are driven by simultaneous time- and spatial-inversion symmetry breaking. I investigate the magnetic structures and excitations in these quantum materials with neutron and X-ray scattering.
Masters projects in the general area of magnetic topological materials and multiferroics are currently available. Contact me for more information.
I was formerly a member of the Boothroyd group in the university of Oxford. I was also a tutor at St Anne's college for the 3rd year condensed matter physics course.
Masters projects in the general area of magnetic topological materials and multiferroics are currently available. Contact me for more information.
I was formerly a member of the Boothroyd group in the university of Oxford. I was also a tutor at St Anne's college for the 3rd year condensed matter physics course.
Education
DPhil
Condensed Matter Physics
University of Oxford
Oct 2016 - Oct 2019
BSc
Physics
Imperial College London
Oct 2012 - June 2015
Publications
Selected publications
| Neutron scattering of local non-centrosymmetric magnetoelectric multipoles.
We address magnetic neutron scattering in the presence of local non-centrosymmetric asymmetries of the magnetization density. Such inversion-symmetry breaking, combined with the absence of time-reversal symmetry, can be described in terms of magnetoelectric multipoles which form the second term after the magnetic dipole in the multipole expansion of the magnetization density. We provide a pedagogical review of the theoretical formalism of magnetic neutron diffraction in terms of the multipole expansion of the scattering cross-section. In particular, we show how to compute the contribution of magnetoelectric multipoles to the scattering amplitude starting from ab initio calculations. We also provide general guidelines on how to experimentally detect long-ranged order of magnetoelectric multipoles using either unpolarized or polarized neutron scattering. As a case study, we search for the presence of magnetoelectric multipoles in CuO by comparing theoretical first-principle predictions with experimental spherical neutron polarimetry measurements. |
Andrea Urru, Jian-Rui Soh, Navid Qureshi, Anne Stunault, Bertrand Roessli, Henrik M. Rønnow, Nicola A. Spaldin |
| Discovery of an ideal Weyl semimetal Weyl semimetals exhibit exceptional electronic transport due to the presence of topological band crossings called Weyl nodes. The nodes come in pairs with opposite chirality, but their number and location in momentum space is otherwise material-specific. Together with colleagues in the Rudolf Peierls Centre for Theoretical Physics, Oxford, and a team of international collaborators, we have found that the layered intermetallic EuCd2As2 in a magnetic field is what Bernevig has termed the hydrogen atom of a Weyl semimetal, i.e. one with a single pair of Weyl nodes at the Fermi level and without overlapping electron bands. The discovery opens the door to exploration of a wide range of exotic physics predicted for Weyl fermions in the solid state. https://arxiv.org/abs/1901.10022 |
J.-R. Soh, F. de Juan, M. G. Vergniory, N. B. M. Schröter, M. C. Rahn, D. Y. Yan, J. Jiang, M. Bristow, P. Reiss, J. N. Blandy, Y. F. Guo, Y. G. Shi, T. K. Kim, A. McCollam, S. H. Simon, Y. Chen, A. I. Coldea, and A. T. Boothroyd |
| Ground-state magnetic structure of Mn3Ge The antiferromagnet Mn3Ge has been recently shown to exhibit a large spontaneous anomalous Hall effect, which can be switched by a small magnetic field and which has been attributed to topologically protected Weyl nodes. Up till now, the true ground-state magnetic structure of the compound has eluded countless experimental studies, which began some fifty years ago. Here, we report the use of an advanced polarized neutron scattering technique to resolve unambiguously the magnetic structure of this compound. https://arxiv.org/abs/2001.02601 |
J.-R. Soh, F. de Juan, N. Qureshi, H. Jacobsen, H.-Y. Wang, Y.-F. Guo, and A. T. Boothroyd |
| Magnetic structure and excitations of YbMnBi2 One of the major themes in solid-state physics is the realization of exotic types of relativistic electrons that travel at speeds much slower than the speed of light. These electrons live in crystals with very specific structural properties, one such material being the Weyl semimetal. The compound YbMnBi2 has been proposed as a candidate if it possesses a very specific type of magnetic order. In this work, we establish conclusively that YbMnBi2 is not a Weyl semimetal. https://arxiv.org/abs/1908.04872 |
Jian-Rui Soh, Henrik Jacobsen, Bachir Ouladdiaf, Alexandre Ivanov, Andrea Piovano, Tim Tejsner, Zili Feng, Hongyuan Wang, Hao Su, Yanfeng Guo, Youguo Shi, and Andrew T. Boothroyd |
Other publications
Magnetic excitations in the topological semimetal YbMnSb2
Siobhan M. Tobin, Jian-Rui Soh, Hao Su, Andrea Piovano, Anne Stunault, J. Alberto Rodríguez-Velamazán, Yanfeng Guo, Andrew T. Boothroyd
https://arxiv.org/abs/2302.07007
EuCd2As2: a magnetic semiconductor
D. Santos-Cottin, I. Mohelský, J. Wyzula, F. Le Mardelé, I. Kapon, S. Nasrallah, N. BarišIć, I. Živković, J. R. Soh, F. Guo, M. Puppin, J. H. Dil, B. Gudac, Z. Rukelj, M. Novak, A. B. Kuzmenko, C. C. Homes, Tomasz Dietl, M. Orlita, Ana Akrap
https://arxiv.org/abs/2301.08014
Charge multipoles correlations and order in Cs2TaCl6
Aria Mansouri Tehrani, Jian-Rui Soh, Jana Pásztorová, Maximilian E. Merkel, Ivica Živković, Henrik M. Rønnow, Nicola A. Spaldin
Phys. Rev. Research 5, L012010 – Published 26 January 2023
https://arxiv.org/abs/2207.10042
Unravelling the origin of the peculiar transition in the magnetically ordered phase of the Weyl semimetal Co3Sn2S2
Ivica Zivkovic, Ravi Yadav, Jian-Rui Soh, ChangJiang Yi, YouGuo Shi, Oleg V. Yazyev, Henrik M. Ronnow
Phys. Rev. B 106, L180403 (2022) – Published 21 November 2022
https://arxiv.org/abs/2211.01483
Revisiting the magnetic and crystal structure of multiferroic KNiPO4
Alexandre Pages, Jian-Rui Soh, Marjaneh Jafari Fesharaki, Henrik M. Ronnow, Hossein Ahmadvand
https://arxiv.org/abs/2207.06969
The magnetic structure of the topological semimetal Co3Sn2S2Jian-Rui Soh, ChangJiang Yi, Ivica Zivkovic, Navid Qureshi, Anne Stunault, Bachir Ouladdiaf, J. Alberto Rodriguez-Velamazan, YouGuo Shi, Henrik Ronnow and Andrew T. Boothroyd
Phys. Rev. B 105, 094435 (2022) – Published 28 March 2022
http://arxiv.org/abs/2110.00475
Magnetic structure of the topological semimetal YbMnSb2 (Editors' Suggestion)
Jian-Rui Soh, Siobhan M. Tobin, Hao Su, Ivica Zivkovic, Bachir Ouladdiaf, Anne Stunault, J. Alberto Rodriguez-Velamazan, Ketty Beauvois, Yanfeng Guo, and Andrew T. Boothroyd
Phys. Rev. B 104, L161103 – Published 5 October 2021
https://arxiv.org/abs/2107.02857
Resonant X-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd2As2 and EuCd2Sb2
J.-R. Soh, E. Schierle, D. Y. Yan, H. Su, D. Prabhakaran, E. Weschke, Y. F. Guo, Y. G. Shi and A. T. Boothroyd
Phys. Rev. B 102, 014408 – Published 6 July 2020
https://arxiv.org/abs/2005.04952
Magnetic and electronic structure of Dirac semimetal candidate EuMnSb2
J.-R. Soh, P. Manuel, N. M. B. Schröter, C. J. Yi, F. Orlandi, Y. G. Shi, D. Prabhakaran, and A. T. Boothroyd
Phys. Rev. B 100, 174406 – Published 5 November 2019
https://arxiv.org/abs/1907.05913
Magnetic and electronic structure of the layered rare-earth pnictide EuCd2Sb2
J.-R. Soh, C. Donnerer, K. M. Hughes, E. Schierle, E. Weschke, D. Prabhakaran, and A. T. Boothroyd
Phys. Rev. B 98, 064419 – Published 21 August 2018
https://arxiv.org/abs/1806.00559
Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd2As2
M. C. Rahn, J.-R. Soh, S. Francoual, L. S. I. Veiga, J. Strempfer, J. Mardegan, D. Y. Yan, Y. F. Guo, Y. G. Shi, and A. T. Boothroyd
Phys. Rev. B 97, 214422 – Published 20 June 2018
https://arxiv.org/abs/1803.07061
Large anharmonic effect and thermal expansion anisotropy of metal chalcogenides: The case of antimony sulfide
Chee Kwan Gan, Jian Rui Soh, Yun Liu
Phys. Rev. B 92, 235202 – Published 2 December 2015
https://arxiv.org/abs/1510.04907