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- W2275684103 abstract "We investigate the problem of Dirac fermions living in a background of nematic fluctuations. In our scheme, the local nematic order is carried by Ising spins, and these gauge-like variables are given their own dynamics in the form of a two-dimensional transverse field Ising model. On the basis of quantum Monte Carlo simulations, we present a complete phase diagram, in which the tuning parameters are the applied transverse field and the coupling between the fermions and Ising spins. A careful analysis reveals that, at sufficiently high coupling, the conventional ($2!+!1$)-dimensional Ising universality class of the $T=0$ quantum critical point gives way to a first-order phase transition. There is an additional phase boundary along which the Dirac points smear out to form nodal lines in the Brillouin zone. This boundary extends up from the small-transverse-field region of the phase diagram until it eventually merges into the first-order transition line of the Ising spins at large coupling and large transverse field. Along this boundary, collective bosonic fluctuations with SO(4) symmetry are strongly enhanced; across it, the Dirac points' Berry phase switches." @default.
- W2275684103 created "2016-06-24" @default.
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- W2275684103 date "2016-02-23" @default.
- W2275684103 modified "2023-09-23" @default.
- W2275684103 title "Anisotropic velocity fluctuations of Dirac fermions" @default.
- W2275684103 hasPublicationYear "2016" @default.
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