I'm a PhD student in Theoretical Physics.
I study topological phases of matter.
In layman's terms: I'm using quantum physics to discover new materials that, in some distant future, may be useful in everyday devices like smartphones (which, by the way, already use quantum physics). My work is theoretical: Instead of touching actual materials, I think really hard and contribute to our shared map of materials that are possible at least in principle, and try to find new and interesting landmarks.
 In Group:
 Prof. Dr. Bernd Rosenow at the University of Leipzig.
 Email:
 zirnstein at itp dot unileipzig dot de
 Address:
 Institute for Theoretical Physics
University of Leipzig
Brüderstr. 16
D04103 Leipzig
Room 311a
Notes
Here, I collect various introductory notes, publications and talk transcripts. I hope they are useful.
Expository material
Physics
 "Bulkboundary correspondence for nonHermitian Hamiltonians via Greens function,"
H.G. Z., Gil Refael and Bernd Rosenow. Article, arxiv:1901.11241.
 "Evolution of the transmission phase through a Coulombblockaded Majorana wire,"
Casper Drukier, H.G. Z., Bernd Rosenow, Ady Stern and Yuval Oreg.
Article, Phys. Rev. B 98, 161401(R) (2018), arxiv:1806.01399.

"Timereversalsymmetric topological magnetoelectric effect in threedimensional topological insulators,"
H.G. Z. and Bernd Rosenow.
Article,
Phys. Rev. B 96, 201112(R) (2017),
arxiv:1705.02217.
 "Phase Transitions in Holographic Superconductors of Type II."
Talk for the seminar "Holographic Methods in Condensed Matter Physics", January 2015. [pdf]

"Cancellation of quantum anomalies and bosonization of threedimensional timereversal symmetric topological insulators,"
H.G. Z. and Bernd Rosenow.
Article,
Phys. Rev. B 88, 085105 (2013),
arxiv:1303.2644.
Mathematics