Yue Sun

All Publications

• Observation of a Goldstone mode in the broken helix by time-resolved optical polarimetry PHYSICAL REVIEW B Liebman-Pelaez, A., Garratt, S. J., Sunko, V., Sun, Y., Soh, J. R., Prabhakaran, D., Boothroyd, A. T., Orenstein, J. 2026; 113 (22)

  View details for DOI 10.1103/b48p-kw5l

  View details for Web of Science ID 001789109400001

• Multimodal Approach Reveals the Symmetry-Breaking Pathway to the Broken Helix in EuIn2As2 PHYSICAL REVIEW X Donoway, E., Trevisan, T. V., Liebman-Pelaez, A., Day, R. P., Yamakawa, K., Sun, Y., Soh, J. R., Prabhakaran, D., Boothroyd, A. T., Fernandes, R. M., Analytis, J. G., Moore, J. E., Orenstein, J., Sunko, V. 2024; 14 (3)

  View details for DOI 10.1103/PhysRevX.14.031013

  View details for Web of Science ID 001275632800001

• Dipolar spin wave packet transport in a van der Waals antiferromagnet NATURE PHYSICS Sun, Y., Meng, F., Lee, C., Soll, A., Zhang, H., Ramesh, R., Yao, J., Sofer, Z., Orenstein, J. 2024; 20 (5)

  View details for DOI 10.1038/s41567-024-02387-2

  View details for Web of Science ID 001154940000001

• Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB2C2. Proceedings of the National Academy of Sciences of the United States of America Ye, L., Sun, Y., Sunko, V., Rodriguez-Nieva, J. F., Ikeda, M. S., Worasaran, T., Sorensen, M. E., Bachmann, M. D., Orenstein, J., Fisher, I. R. 2023; 120 (35): e2302800120

  Abstract

  The adiabatic elastocaloric effect measures the temperature change of a given system with strain and provides a thermodynamic probe of the entropic landscape in the temperature-strain space. Here, we demonstrate that the DC bias strain-dependence of AC elastocaloric effect allows decomposition of the latter into symmetric (rotation-symmetry-preserving) and antisymmetric (rotation-symmetry-breaking) strain channels, using a tetragonal [Formula: see text]-electron intermetallic DyB[Formula: see text]C[Formula: see text]-whose antiferroquadrupolar order breaks local fourfold rotational symmetries while globally remaining tetragonal-as a showcase example. We capture the strain evolution of its quadrupolar and magnetic phase transitions using both singularities in the elastocaloric coefficient and its jumps at the transitions, and the latter we show follows a modified Ehrenfest relation. We find that antisymmetric strain couples to the underlying order parameter in a biquadratic (linear-quadratic) manner in the antiferroquadrupolar (canted antiferromagnetic) phase, which are attributed to a preserved (broken) global tetragonal symmetry, respectively. The broken tetragonal symmetry in the magnetic phase is further evidenced by elastocaloric strain-hysteresis and optical birefringence. Additionally, within the staggered quadrupolar order, the observed elastocaloric response reflects a quadratic increase of entropy with antisymmetric strain, analogous to the role magnetic field plays for Ising antiferromagnetic orders by promoting pseudospin flips. Our results demonstrate AC elastocaloric effect as a compact and incisive thermodynamic probe into the coupling between electronic degrees of freedom and strain in free energy, which holds the potential for investigating and understanding the symmetry of a wide variety of ordered phases in broader classes of quantum materials.

  View details for DOI 10.1073/pnas.2302800120

  View details for PubMedID 37607225

• Spin wavepackets in the Kagome ferromagnet Fe3Sn2: Propagation and precursors. Proceedings of the National Academy of Sciences of the United States of America Lee, C., Sun, Y., Ye, L., Rathi, S., Wang, K., Lu, Y. M., Moore, J., Checkelsky, J. G., Orenstein, J. 2023; 120 (21): e2220589120

  Abstract

  The propagation of spin waves in magnetically ordered systems has emerged as a potential means to shuttle quantum information over large distances. Conventionally, the arrival time of a spin wavepacket at a distance, d, is assumed to be determined by its group velocity, vg. Here, we report time-resolved optical measurements of wavepacket propagation in the Kagome ferromagnet Fe3Sn2 that demonstrate the arrival of spin information at times significantly less than d/vg. We show that this spin wave "precursor" originates from the interaction of light with the unusual spectrum of magnetostatic modes in Fe3Sn2. Related effects may have far-reaching consequences toward realizing long-range, ultrafast spin wave transport in both ferromagnetic and antiferromagnetic systems.

  View details for DOI 10.1073/pnas.2220589120

  View details for PubMedID 37186856

• Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd2P2 PHYSICAL REVIEW B Sunko, V., Sun, Y., Vranas, M., Homes, C. C., Lee, C., Donoway, E., Wang, Z., Balguri, S., Mahendru, M. B., Ruiz, A., Gunn, B., Basak, R., Blanco-Casnosa, S., Schierle, E., Weschke, E., Tafti, F., Frano, A., Orenstein, J. 2023; 107 (14)

  View details for DOI 10.1103/PhysRevB.107.144404

  View details for Web of Science ID 000996290600001

• Mapping domain-wall topology in the magnetic Weyl semimetal CeAlSi PHYSICAL REVIEW B Sun, Y., Lee, C., Yang, H., Torchinsky, D. H., Tafti, F., Orenstein, J. 2021; 104 (23)

  View details for DOI 10.1103/PhysRevB.104.235119

  View details for Web of Science ID 000730753000005

• Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics. Physical review letters Rees, D., Lu, B., Sun, Y., Manna, K., Özgür, R., Subedi, S., Borrmann, H., Felser, C., Orenstein, J., Torchinsky, D. H. 2021; 127 (15): 157405

  Abstract

  Despite the fundamental nature of the edge state in topological physics, direct measurement of electronic and optical properties of the Fermi arcs of topological semimetals has posed a significant experimental challenge, as their response is often overwhelmed by the metallic bulk. However, laser-driven currents carried by surface and bulk states can propagate in different directions in nonsymmorphic crystals, allowing for the two components to be easily separated. Motivated by a recent theoretical prediction G. Chang et al., Phys. Rev. Lett. 124, 166404 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.166404, we have measured the linear and circular photogalvanic effect currents deriving from the Fermi arcs of the nonsymmorphic, chiral Weyl semimetal RhSi over the 0.45-1.1 eV incident photon energy range. Our data are in good agreement with the predicted spectral shape of the circular photogalvanic effect as a function of photon energy, although the direction of the surface photocurrent departed from the theoretical expectation over the energy range studied. Surface currents arising from the linear photogalvanic effect were observed as well, with the unexpected result that only two of the six allowed tensor element were required to describe the measurements, suggesting an approximate emergent mirror symmetry inconsistent with the space group of the crystal.

  View details for DOI 10.1103/PhysRevLett.127.157405

  View details for PubMedID 34678039