5 papers
Catastrophe theory classification of Fermi surface topological transitions in two dimensions
Anirudh Chandrasekaran, Alex Shtyk, Joseph J. Betouras +1
We classify all possible singularities in the electronic dispersion of two-dimensional systems that occur when the Fermi surface changes topology, using catastrophe theory. For sys…
Multicritical Fermi surface topological transitions
Dmitry V. Efremov, Alex Shtyk, Andreas W. Rost +3
A wide variety of complex phases in quantum materials are driven by electron-electron interactions, which are enhanced through density of states peaks. A well known example occurs…
Topological electronic properties of silicon
Alex Shtyk, Claudio Chamon
The central role that materials play in human history is exemplified by the three-age division of prehistory into the stone, bronze, and iron ages. References to our present time a…
Ultrasonic attenuation in a pseudogapped superconductor
A. V. Shtyk, M. V. Feigel'man
We develop a theory of ultrasound decay rate in a model of a superconductor with a large pseudogap , and show that at low temperatures () the magnitude of the d…
Electrons at the monkey saddle: a multicritical Lifshitz point
Alex Shtyk, Garry Goldstein, Claudio Chamon
We consider 2D interacting electrons at a monkey saddle with dispersion . Such a dispersion naturally arises at the multicritical Lifshitz point when three…