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8 papers
5G from Space: An Overview of 3GPP Non-Terrestrial Networks
Xingqin Lin, Stefan Rommer, Sebastian Euler +2
We provide an overview of the 3rd generation partnership project (3GPP) work on evolving the 5G wireless technology to support non-terrestrial satellite networks. Adapting 5G to su…
Spin- and charge-density oscillations in spin chains and quantum wires
Stefan Rommer, Sebastian Eggert
We analyze the spin- and charge-density oscillations near impurities in spin chains and quantum wires. These so-called Friedel oscillations give detailed information about the impu…
Phase separation in t-J ladders
Stefan Rommer, Steven R. White, D. J. Scalapino
The phase separation boundary of isotropic t-J ladders is analyzed using density matrix renormalization group techniques. The complete boundary to phase separation as a function of…
Impurity corrections to the thermodynamics in spin chains using a transfer-matrix DMRG method
Stefan Rommer, Sebastian Eggert
We use the density matrix renormalization group (DMRG) for transfer matrices to numerically calculate impurity corrections to thermodynamic properties. The method is applied to two…
A two-channel Kondo impurity in the spin-1/2 chain: Consequences for Knight shift experiments
Sebastian Eggert, Stefan Rommer
A magnetic impurity in the spin-1/2 chain is a simple realization of the two-channel Kondo problem since the field theoretical descriptions in the spin-sector are identical. The co…
Universal cross-over behavior of a magnetic impurity and consequences for doping in spin-1/2 chains
Sebastian Eggert, Stefan Rommer
We consider a magnetic impurity in the antiferromagnetic spin-1/2 chain which is equivalent to the two-channel Kondo problem in terms of the field theoretical description. Using a…
A class of ansatz wave functions for 1D spin systems and their relation to DMRG
Stefan Rommer, Stellan Ostlund
We investigate the density matrix renormalization group (DMRG) discovered by White and show that in the case where the renormalization eventually converges to a fixed point the DMR…
Thermodynamic limit of the density matrix renormalization for the spin-1 Heisenberg chain
Stellan Ostlund, Stefan Rommer
The density matrix renormalization group (``DMRG'') discovered by White has shown to be a powerful method to understand the properties of many one dimensional quantum systems. In t…