Condensed and Living Matter

Title: “Shot noise as a probe of correlated materials / Light emission as a probe of electronic pDNrocesses at the nanoscale”

Strange metal behavior has been observed in materials ranging from high-temperature superconductors to heavy fermion metals. In conventional metals, current is carried by quasiparticles; although it has been suggested that quasiparticles are absent in strange metals, direct experimental evidence is challenging to acquire. We measure shot noise to probe the granularity of the current-carrying excitations in nanowires of the heavy fermion strange metal YbRh2Si2.

When compared to conventional metals, shot noise in these nanowires is strongly suppressed. We argue that this suppression can be attributed neither to electron-phonon nor to electron-electron interactions in a Fermi liquid, suggesting that the current is not carried by well-defined quasiparticles in the strange metal regime we probed.

This work sets the stage for similar studies of other strange metals, to test for universality of this response, and ideally for studies in single devices that may be tuned between Fermi liquid and strange metal regimes. It is also important to consider the noise in strongly interacting Fermi liquids, to see if interactions modify the expectations familiar from conventional mesoscopic physics. Time permitting, I will discuss some recent interesting findings in YbAl3, a mixed valence heavy fermion material.

Title: “Robust prediction of moiré material topology" Valentin Crepel Flatiron Institute Research Synopsis: Moiré materials have recently been envisioned as condensed-matter quantum simulators due to their highly tunable low-energy properties controlled by chemical composition, stacking configurations, twist angles, and gating. Realizing their full potential as practical quantum simulators requires a systematic approach to identify which...

Title: “TBA” Abstract: Atomically thin van der Waals materials provide a versatile and unique platform for exploring novel physical interactions at low dimensionality and enabling new device geometries with tunable functionalities. In this talk, I will mainly focus on our recent progress on 2D magnetic materials and low-dimensional magnetic molecules. The first part will include...

Title: “TBA” Abstract: TBA   Zhehao Dai Assistant Professor of Physics, University of Pittsburgh Zhehao Dai is a condensed matter theorist. Zhehao obtained a Ph.D. in Theoretical Condensed Matter Physics at MIT in (2020). The topic of Zhehao’s thesis was on the intriguing physics of gapless states in strongly correlated condensed matter systems. This is...

Title: “TBA” Abstract: TBA   Steven Anlage Professor of Physics, University of Maryland Steven Anlage received his Ph.D. in Applied Physics from the California Institute of Technology. He is a member of the Quantum Materials Center at UMD, where he leads experimental research activities in superconducting metamaterials, quantum chaos, and various types of quantitative high-resolution...