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13 papers · 1 filter
Real-space perturbation theory for frustrated magnets: application to magnetization plateaus
M. E. Zhitomirsky
We present a unified approach to the problem of degeneracy lifting in geometrically frustrated magnets with and without an external field. The method treats fluctuations around a c…
Unidirectional light emission from low-index polymer microlasers
M. Schermer, S. Bittner, G. Singh +3
We report on experiments with deformed polymer microlasers that have a low refractive index and exhibit unidirectional light emission. We demonstrate that the highly directional em…
Quantum attacks against iterated block ciphers
Marc Kaplan
We study the amplification of security against quantum attacks provided by iteration of block ciphers. In the classical case, the Meet-in-the-middle attack is a generic attack agai…
Quantum Selection of Order in an Antiferromagnet on a Kagomé Lattice
A. L. Chernyshev, M. E. Zhitomirsky
Selection of the ground state of the kagomé-lattice antiferromagnet by quantum fluctuations is investigated by combining non-linear spin-wave and real-space perturbation theo…
Spectral Properties and Dynamical Tunneling in Constant-Width Billiards
B. Dietz, T. Guhr, B. Gutkin +2
We determine with unprecedented accuracy the lowest 900 eigenvalues of two quantum constant-width billiards from resonance spectra measured with flat, superconducting microwave res…
Role of dimensionality in spontaneous magnon decay: easy-plane ferromagnet
V. A. Stephanovich, M. E. Zhitomirsky
We calculate magnon lifetime in an easy-plane ferromagnet on a tetragonal lattice in transverse magnetic field. At zero temperature magnons are unstable with respect to spontaneous…