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Zero-field composite Fermi liquid in twisted semiconductor bilayers
- Source :
- PhysRevLett.131.13650. (2023)
- Publication Year :
- 2023
-
Abstract
- Recent experiments have produced evidence for fractional quantum anomalous Hall (FQAH) states at zero magnetic field in the semiconductor moir\'e superlattice system $t$MoTe$_2$. Here we argue that a composite fermion description, already a unifying framework for the phenomenology of 2d electron gases at high magnetic fields, provides a similarly powerful perspective in this new context. To this end, we present exact diagonalization evidence for composite Fermi liquid states at zero magnetic field in $t$MoTe$_2$ at fillings $n=\frac{1}{2}$ and $n=\frac{3}{4}$. We dub these non-Fermi liquid metals anomalous composite Fermi liquids (ACFLs), and we argue that they play a central organizing role in the FQAH phase diagram. We proceed to develop a long wavelength theory for this ACFL state that offers concrete experimental predictions upon doping the composite Fermi sea, including a Jain sequence of FQAH states and a new type of commensurability oscillations originating from the superlattice potential intrinsic to the system.<br />Comment: Phys. Rev. Lett. journal version. Editors' Suggestion and Featured in Physics. main: 5 pages, 3 figures. SM: 5 pages, 3 figures
Details
- Database :
- arXiv
- Journal :
- PhysRevLett.131.13650. (2023)
- Publication Type :
- Report
- Accession number :
- edsarx.2306.02513
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.131.136501