We worked with Haim Beidenkopf’s WASP lab to show how a higher-order van Hove singularity can drive a Pomeranchuk instability on the distorted kagome surface of Co3Sn2S2. The preprint is available on arXiv.
Nishchhal Verma explains how instantaneous response and conductivity sum rules reveal quantum-geometric information in correlated and flat-band systems. Watch the KITP recording.
We worked with Leslie Schoop’s group to show that spin-orbit coupling reshapes the Fermi surface of Sm3ZrBi5 and produces quasi-one-dimensional transport in a three-dimensional crystal. The work is published in Advanced Materials.
Ilia, working with Tobias Holder, showed that quantum geometry controls the intrinsic capacitance of insulators. Read the Columbia Quantum article about the work, published in Nature Communications.
Raquel's lecture at the 2024 IAS Prospects in Theoretical Physics program connects the quantum geometry of Bloch states to linear-response observables.
Julian began his Columbia postdoctoral appointment after first working with the group as a visiting student. He studies topological matter, moiré transition-metal dichalcogenides, unconventional superconductivity, and quantum materials.
A public lecture on how geometry organizes quantum matter, recorded at the Aspen Center for Physics. Listen to the audio from Aspen Public Radio or watch the video.
We worked with Zhida Song, Ady Stern, and Andrei Bernevig to show that strong local impurities can generate in-gap ring states pinned by zeros of the impurity-projected Green function; their protection follows from the Wannier obstruction of the topological bands.
Nish worked with Daniele Guerci to show that the quantum metric can dominate the phase stiffness of an interlayer exciton condensate and enhance its transition temperature. The work is published in Physical Review Letters.
Ilia worked with Tobias Holder to show that an insulator's intrinsic capacitance is set by the quantum metric and the spectral gap, turning a familiar electrical response into a probe of wavefunction geometry. The work is published in Nature Communications.
We worked with Valentin Crépel and Nicolas Regnault to identify a chiral limit for twisted transition-metal dichalcogenide homobilayers and explain the origin of their topological flat bands. The work is published in Communications Physics.
We worked with Zhi-Da Song’s group to show that topology and a magnetic crystalline symmetry preserved on average can protect a critical metal against Anderson localization. The work is published in Nature Communications.