Reimagining two-channel Kondo physics: fermions to bosons and back in a consistent way

by Prof. Nayana Shah (Washington University in St. Louis)

Wednesday 16 Jul 2025, 11:00 → 12:00 Europe/Zurich

WHGA/121

The two-channel Kondo model has been a theoretical and experimental playground to understand and probe intermediate coupling fixed points with non-Fermi liquid behavior. We revisit the compactification procedure of the (multi) two-channel Kondo model that rewrites it more “compactly” using the single-channel version of the model by exploiting spin-charge separation. We show that bosonization-debosonization (BdB) can be used as a systematic method for that purpose but only if we use a consistent BdB framework [1,2,3]. In doing so, we also advance the consistent framework [4,5] and further establish why it is so essential to be cognizant of the pitfalls of the conventional BdB framework. Extensive comparisons are carried out in exact limits [1] as well as by using poor man's scaling [2] and field-theoretic renormalization group methods [3]; on the way furthering the latter as well. 

 

[1] A. Ljepoja, C.J. Bolech, Nayana Shah, Phys. Rev. B 110, 045108 (2024)

[2] A. Ljepoja, N. Shah, C.J. Bolech, Phys. Rev. B 110, 045109 (2024)

[3] A. Ljepoja, C.J. Bolech, N. Shah, Phys. Rev. B 110, 045110 (2024)

[4] N. Shah and C.J. Bolech, Phys. Rev. B 93, 085440 (2016)
[5] C.J. Bolech and N. Shah, Phys. Rev. B 93, 085441 (2016)