Abstract
Quantum dot devices allow one to access the critical point of the two-channel Kondo model. The effective critical theory involves a free Majorana fermion quasiparticle localized on the dot. As a consequence, this critical point shows both the phenomenon of non-Fermi-liquid physics and fractionalization. Although a violation of the Wiedemann-Franz law is often considered to be a sign of non-Fermi-liquid systems, we show by exact calculations that it holds at the critical point, thereby providing a counterexample to this lore. Furthermore, we show that the fractionalized Majorana character of the critical point can be unambiguously detected from the heat conductance, opening the door to a direct experimental measurement of the elusive Majorana central charge
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Original language | English |
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Article number | 041111 |
Pages (from-to) | 1-5 |
Number of pages | 5 |
Journal | Physical Review B |
Volume | 102 |
Issue number | 4 |
DOIs | |
Publication status | Published - 8 Jul 2020 |