Zobrazeno 1 - 10
of 172
pro vyhledávání: '"P. Piechon"'
Publikováno v:
IUCrJ, Vol 11, Iss 3, Pp 347-358 (2024)
Categorization underlies understanding. Conceptualizing solid-state structures of organic molecules with `archetype crystal structures' bridges established categories of disorder, polymorphism and solid solutions and is herein extended to special pos
Externí odkaz:
https://doaj.org/article/0f545088154c42d48bae254e6c21e02a
Autor:
Bustamante, J. Vallejo, Ribeiro-Palau, R., Fermon, C., Watanabe, M. Pannetier-Lecoeur K., Tanigushi, T., Deblock, R., Guéron, S., Ferrier, M., Fuchs, J. N., Montambaux, G., Piéchon, F., Bouchiat, H.
The recent detection of the singular diamagnetism of Dirac electrons in a single graphene layer paved a new way of probing 2D quantum materials through the measurement of equilibrium orbital currents which cannot be accessed in usual transport experi
Externí odkaz:
http://arxiv.org/abs/2303.17500
Autor:
Sticlet, Doru, Piéchon, Frédéric
Publikováno v:
Phys. Rev. B 107, 195404 (2023)
We study the continuum limit of two-dimensional chiral magnets in which Dzyaloshinskii-Moriya interaction (DMI) is due to the interplay between a smooth magnetic texture and spin-orbit coupling. The resulting free-energy density of the system contain
Externí odkaz:
http://arxiv.org/abs/2301.11855
Publikováno v:
Phys. Rev. B 107, 045117 (2023)
Graphene can be turned into a semimetal with broken time-reversal symmetry by adding a valley-dependent pseudo-scalar potential that shifts the Dirac point energies in opposite directions, as in the modified Haldane model. We consider a bilayer obtai
Externí odkaz:
http://arxiv.org/abs/2208.02491
Publikováno v:
Phys. Rev. B 108, 064210 (2023)
The tight-binding model for a chain, where the hopping constants follow a Fibonacci sequence, predicts multifractality in the spectrum and wavefunctions. Experimentally, we realize this model by chains of small dielectric resonators with high refract
Externí odkaz:
http://arxiv.org/abs/2207.13755
Autor:
Graf, Ansgar, Piéchon, Frédéric
Publikováno v:
Phys. Rev. B 108, 115105 (2023)
Three-dimensional topological semimetals exhibit linear energy band crossing points that act as monopoles of Berry curvature. Here, an alternative class of semimetals is introduced, featuring linear $N$-fold crossing points each of which acts as a so
Externí odkaz:
http://arxiv.org/abs/2203.09966
Autor:
Graf, Ansgar, Piéchon, Frédéric
Publikováno v:
Phys. Rev. B 104, 195128 (2021)
Being dispersionless, flat bands on periodic lattices are solely characterized by their macroscopically degenerate eigenstates: compact localized states (CLSs) in real space and Bloch states in reciprocal space. Based on this property, this work pres
Externí odkaz:
http://arxiv.org/abs/2106.10664
Autor:
Fuchs, J. -N., Piéchon, F.
Publikováno v:
Phys. Rev. B 104, 235428 (2021)
The topological invariants of band insulators are usually assumed to depend only on the connectivity between orbitals and not on their intra-cell position (orbital embedding), which is a separate piece of information in the tight-binding description.
Externí odkaz:
http://arxiv.org/abs/2106.03595
Autor:
Graf, Ansgar, Piéchon, Frédéric
Publikováno v:
Phys. Rev. B 104, 085114 (2021)
The eigenvalues of a parameter-dependent Hamiltonian matrix form a band structure in parameter space. In such $N$-band systems, the quantum geometric tensor (QGT), consisting of the Berry curvature and quantum metric tensors, is usually computed from
Externí odkaz:
http://arxiv.org/abs/2102.09899
Publikováno v:
Phys. Rev. B 101, 045131 (2020)
The energy spectra for the tight-binding models on the Lieb and kagom\'e lattices both exhibit a flat band. We present a model which continuously interpolates between these two limits. The flat band located in the middle of the three-band spectrum fo
Externí odkaz:
http://arxiv.org/abs/1906.12002