@article{ISI:000308001400016,
 abstract = {We develop a continuum theory to model low energy excitations of a
generic four-band time reversal invariant electronic system with
boundaries. We propose a variational energy functional for the
wavefunctions which allows us to derive natural boundary conditions
valid for such systems. Our formulation is particularly suited for
developing a continuum theory of the protected edge/surface excitations
of topological insulators both in two and three dimensions. By a
detailed comparison of our analytical formulation with tight binding
calculations of ribbons of topological insulators modelled by the
Bernevig-Hughes-Zhang (BHZ) Hamiltonian, we show that the continuum
theory with a natural boundary condition provides an appropriate
description of the low energy physics.},
 article-number = {355001},
 author = {Medhi, Amal and Shenoy, Vijay B.},
 doi = {10.1088/0953-8984/24/35/355001},
 eissn = {1361-648X},
 issn = {0953-8984},
 journal = {JOURNAL OF PHYSICS-CONDENSED MATTER},
 month = {SEP 5},
 number = {35},
 orcid-numbers = {Medhi, Amal/0000-0001-5322-1649},
 times-cited = {18},
 title = {Continuum theory of edge states of topological insulators: variational
principle and boundary conditions},
 unique-id = {ISI:000308001400016},
 volume = {24},
 year = {2012}
}