Institute for Quantum Matter

Magnons from molecular spins in chiral Cu20Se03

The asymmetric magnetic interactions that control the low energy excitations and the skyrmionic spin texture of Cu₂OSeO₃ were determined using inelastic neutron scattering and a coarse-grained description of this chiral breathing pyrochlore ferrimagnet.

Find Out More
New trimer-based spin liquid candidates

A previously unreported family of materials has been discovered with unconventional magnetic properties that are consistent the realization of the quantum spin liquid. The materials consist of triangular lattices of magnetic trimer molecules of the form Rh₃O₁₂ and Ir₃O₁₂ with 4d and 5d electron based magnetism.

Find Out More
Room-temperature THz anomalous Hall effect in Weyl antiferromagnet Mn3Sn films

Using time-domain THz spectroscopy and polarimetry, we have measured the magneto-optical response of the Weyl AF Mn₃Sn. A large anomalous Hall conductivity |σxy|~20 Ω- 1cm-1 at THz frequencies is clearly observed as polarization rotation. Gapping of the Fermi surfaces is apparent due to translation symmetry breaking in the helical phase.

Find Out More
Probing magnon dynamics and interactions in a ferromagnetic spin-1 chain

Using time-domain THz spectroscopy, we measure the low-energy EM response of the spin-1 ferromagnetic spin chain NiNb₂O₆ as a function of temperature and external magnetic field.

Find Out More
Antiferromagnetic domain walls in ferromagnetic Yb2Ti2O7

We show that ferromagnetic and antiferromagnetic states are nearly degenerate in the frustrated quantum magnet Yb₂Ti₂O₇. The long range nature of dipole interactions consequently induce a mixed FM/AFM state at low fields where AFM slabs serve as domain walls.

Find Out More
Anti-chiral spin order its Goldstone modes and their hybridization with phonons in the topological semimetal Mn3Ge

The anti-chiral spin structure of Mn₃Ge and its low energy excitations were determined using neutron scattering techniques. We developed a field theory of long-wavelength spin waves for Mn₃Ge and establish a spin-Hamiltonian model, which accounts for the spin order and low energy excitations.

Find Out More
Puzzling Itinerant Magnetism

Yi Li and two graduate students, Eric Bobrow and Keaton Stubis, studied itinerant ferro magnetism arising from the coherent motion of a single hole in the strong interaction regime. Using the mathematics of the 15-puzzle, they extended a well-known theorem that describes this itinerant ferromagnetism to almost every non-separable graph.

Find Out More
Interfacing a Dirac semimetal with magnetism

We have measured Fermi-energy-dependent quantum transport in electrostatically-gated thin films of the Dirac semimetal Cd3As2 interfaced with a ferromagnet.

Find Out More
Axion Magnetoelectric Coupling in the Hybrid Wannier Representation

A large class of topological insulators (TIs) is characterized by the presence of a quantized magneto-electric (ME) “axion” coupling. We have developed a detailed theory connecting this axion coupling to features of the hybrid Wannier (HW) representation, which has emerged as one of the most important theoretical tools for understanding TIs.

Find Out More
Dirac Fermions and Possible Weak Antilocalizationin LaCuSb2

We predicted and then experimentally showed that LaCuSb₂, previously reported to be superconducting, hosts Dirac fermions with an effective mass of 0.06 m_e.

Find Out More

The Institute for Quantum Matter is an Energy Frontier Research Center that is realizing revolutionary quantum materials and structures where quantum effects such as entanglement and coherence find collective macroscopic manifestations. We expose, understand, and control the corresponding physical properties and explore their potential for energy-related applications.

News

November 23, 2020

Now Accepting Applications for IQM Condensed Matter Theory Postdoctoral Fellow

The Institute for Quantum Matter (IQM) at the Johns Hopkins University invites applications for the IQM Condensed Matter Theory Postdoctoral Fellow position sponsored by the DOE Energy Frontier Research Center. The postdoctoral fellow is expected to interact with faculty in condensed matter theory and conduct theoretical research on the frontiers in quantum matter, including but not limited […]

May 29, 2020

Three IQM Principal Investigators Receive Grants from the Gordon and Betty Moore Foundation to Further our Understanding of Quantum Materials

N. Peter Armitage and Collin Broholm of JHU, and Prof. Bob Cava of Princeton University, have each received grants from the Gordon and Betty Moore Foundation to further our understanding of the ‘weirdness’ of quantum materials. The funding is provided by the The foundation’s Emergent Phenomena in Quantum Systems (EPiQS) Initiative.

View All News

Explore JHU

Inside the Krieger School

Student & Faculty Resources

Across Campus

Institute for Quantum Matter

Magnons from molecular spins in chiral Cu20Se03

New trimer-based spin liquid candidates

Room-temperature THz anomalous Hall effect in Weyl antiferromagnet Mn3Sn films

Probing magnon dynamics and interactions in a ferromagnetic spin-1 chain

Antiferromagnetic domain walls in ferromagnetic Yb2Ti2O7

Anti-chiral spin order its Goldstone modes and their hybridization with phonons in the topological semimetal Mn3Ge

Puzzling Itinerant Magnetism

Interfacing a Dirac semimetal with magnetism

Axion Magnetoelectric Coupling in the Hybrid Wannier Representation

Dirac Fermions and Possible Weak Antilocalizationin LaCuSb2

News

Now Accepting Applications for IQM Condensed Matter Theory Postdoctoral Fellow

Three IQM Principal Investigators Receive Grants from the Gordon and Betty Moore Foundation to Further our Understanding of Quantum Materials