Abstract
We explore the possibility of quantum liquids that are compressible but have vanishing dc conductivity in the absence of disorder. We show that the composite Fermi liquid emerging from strong interaction in a generic Chern band has zero Drude weight, in stark contrast to normal Fermi liquids. Our Letter establishes the absence of Drude weight as the defining property of the composite Fermi liquid phase, which distinguishes it from the Fermi liquid or other types of non-Fermi liquids. Our findings point to a possibly wide class of gapless quantum phases with unexpected transport and optical properties.
| Original language | English |
|---|---|
| Article number | 176501 |
| Journal | Physical Review Letters |
| Volume | 134 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 2 May 2025 |
Funding
We thank Aidan Reddy for helpful discussions. This work was supported by the Air Force Office of Scientific Research (AFOSR) under Award No. FA9550-22-1-0432 and benefited from computing resources provided by the MIT SuperCloud and Lincoln Laboratory Supercomputing Center. A. A. was supported by the Knut and Alice Wallenberg Foundation (KAW 2022.0348). N. P. acknowledges support from the KITP graduate fellowship. L. F. was partly supported by the Simons Investigator Award from the Simons Foundation. A. S. was supported by grants from the ERC under the European Union’s Horizon 2020 research and innovation program (Grant Agreement LEGOTOP No. 788715) and the DFG (CRC/Transregio 183, EI 519/71).
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy