119 citations · 246 across the 9 of their papers we have counts for
11 papers
Anharmonic Fluctuations Govern the Band Gap of Halide Perovskites
Stefan A. Seidl, Xiangzhou Zhu, Guy Reuveni +5
We determine the impact of anharmonic thermal vibrations on the fundamental band gap of CsPbBr, a prototypical model system for the broader class of halide perovskite semicondu…
Static and Dynamic Disorder in Formamidinium Lead Bromide Single Crystals
Guy Reuveni, Yael Diskin-Posner, Christian Gehrmann +8
We show that formamidinium lead bromide is unique among the halide perovskite crystals because its inorganic sub-lattice exhibits intrinsic local static disorder that co-exists wit…
Probing the Disorder inside the Cubic Unit Cell of Halide Perovskites from First-Principles
Xiangzhou Zhu, Sebastián Caicedo-Dávila, Christian Gehrmann +1
Strong deviations in the finite temperature atomic structure of halide perovskites from their average geometry can have profound impacts on optoelectronic and other device-relevant…
Transversal Halide Motion Intensifies Band-To-Band Transitions in Halide Perovskites
Christian Gehrmann, Sebastián Caicedo-Dávila, Xiangzhou Zhu +1
Despite their puzzling vibrational characteristics that include strong signatures of anharmonicity and thermal disorder already around room temperature, halide perovskites exhibit…
A Decentralized Dynamic PKI based on Blockchain
Mohsen Toorani, Christian Gehrmann
The central role of the certificate authority (CA) in traditional public key infrastructure (PKI) makes it fragile and prone to compromises and operational failures. Maintaining CA…
Lic-Sec: an enhanced AppArmor Docker security profile generator
Hui Zhu, Christian Gehrmann
Along with the rapid development of cloud computing technology, containerization technology has drawn much attention from both industry and academia. In this paper, we perform a co…
Anharmonic Host Lattice Dynamics Enable Fast Ion Conduction in Superionic AgI
Thomas M. Brenner, Christian Gehrmann, Roman Korobko +3
Basic understanding of the driving forces of ion conduction in solids is critical to the development of new solid-state ion conductors. Physical understanding of ion conduction is…
Dynamic Shortening of Disorder Potentials in Anharmonic Halide Perovskites
Christian Gehrmann, David A. Egger
Halide perovskites are semiconductors that exhibit sharp optical absorption edges and small Urbach energies allowing for efficient collection of sunlight in thin-film photovoltaic…
Structure and Binding in Halide Perovskites: Analysis of Static and Dynamic Effects from Dispersion-Corrected Density Functional Theory
Hubert Beck, Christian Gehrmann, David A. Egger
We investigate the impact of various levels of approximation in density functional theory calculations for the structural and binding properties of the prototypical halide perovski…
SDN Access Control for the Masses
Nicolae Paladi, Christian Gehrmann
The evolution of Software-Defined Networking (SDN) has so far been predominantly geared towards defining and refining the abstractions on the forwarding and control planes. However…
TruSDN: Bootstrapping Trust in Cloud Network Infrastructure
Nicolae Paladi, Christian Gehrmann
Software-Defined Networking (SDN) is a novel architectural model for cloud network infrastructure, improving resource utilization, scalability and administration. SDN deployments i…