TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.19.3.075
TI  - Rainbow chains and numerical renormalisation group for accurate chiral conformal spectra
PY  - 2025/09/26
UR  - https://www.scipost.org/SciPostPhys.19.3.075
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 19
IS  - 3
SP  - 075
A1  - Szabó, Attila
AB  - Based on the relationship between reduced and thermal density matrices in conformal field theory (CFT), we show that the entanglement spectrum of a conformal critical chain with exponentially decaying terms consists of conformal towers of the associated chiral CFT, with only weak finite-size effects. Through free-fermion and interacting examples, we show that these entanglement spectra present a reliable method to extract detailed CFT spectra from single wave functions without access to the parent Hamiltonian. We complement our method with a Wilsonian numerical renormalisation group algorithm for solving interacting, exponentially decaying chain Hamiltonians.
ER  -

@Article{10.21468/SciPostPhys.19.3.075,
	title={{Rainbow chains and numerical renormalisation group for accurate chiral conformal spectra}},
	author={Attila Szabó},
	journal={SciPost Phys.},
	volume={19},
	pages={075},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.19.3.075},
	url={https://scipost.org/10.21468/SciPostPhys.19.3.075},
}