期刊
PHYSICAL REVIEW B
卷 102, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.041111
关键词
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资金
- D-ITP consortium, a program of the Netherlands Organisation for Scientific Research (NWO) - Dutch Ministry of Education, Culture and Science (OCW)
- Irish Research Council Laureate Awards [IRCLA/2017/169]
Quantum dot devices allow one to access the critical point of the two-channel Kondo model. The effective critical theory involves a freeMajorana 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 c = 1/2.
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