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Wiedemann-Franz law and Fermi liquids
Ali Lavasani, Daniel Bulmash, Sankar Das Sarma
We consider in depth the applicability of the Wiedemann-Franz (WF) law, namely that the electronic thermal conductivity () is proportional to the product of the absolute tempera…
Quantum oscillations from generic surface Fermi arcs and bulk chiral modes in Weyl semimetals
Yi Zhang, Daniel Bulmash, Pavan Hosur +2
We re-examine the question of quantum oscillations from surface Fermi arcs and chiral modes in Weyl semimetals. By introducing two tools - semiclassical phase-space quantization an…
Quantum Oscillations in Weyl and Dirac Semimetal Ultra-Thin Films
Daniel Bulmash, Xiao-Liang Qi
We show that a thin film of Weyl or Dirac semimetal with a strong in-plane magnetic field becomes a novel two-dimensional Fermi liquid with interesting properties. The Fermi surfac…
The almost mobility edge in the almost Mathieu equation
Yi Zhang, Daniel Bulmash, Akash V. Maharaj +2
Harper's equation (aka the "almost Mathieu" equation) famously describes the quantum dynamics of an electron on a one dimensional lattice in the presence of an incommensurate poten…
Unified Topological Response Theory for Gapped and Gapless Free Fermions
Daniel Bulmash, Pavan Hosur, Shou-Cheng Zhang +1
We derive a scheme for systematically enumerating the responses of gapped as well as gapless systems of free fermions to electromagnetic and strain fields starting from a common pa…
Prediction of a Weyl Semimetal in HgCdMnTe
Daniel Bulmash, Chao-Xing Liu, Xiao-Liang Qi
We study strained HgCdMnTe in a magnetic field using a model and predict that the system is a Weyl semimetal with two nodes in an experimental…