Mukati, Prateek Agarwala, Adhip Bhattacharjee, Subhro

We investigate a symmetry-protected Z2 topological electron glass, a glassy equivalent of the Z2 topological band insulator in crystalline systems, and uncover associated quantum phase transitions in this three-dimensional amorphous network of atoms. Through explicit numerical calculations of the Witten effect, we show that the Z2 glass is characte...

Wu, Xiao-Chuan Xu, Yichen Geng, Hao Jian, Chao-Ming Xu, Cenke

We discuss the boundary critical behaviors of two dimensional quantum phase transitions with fractionalized degrees of freedom in the bulk, motivated by the fact that usually it is the $1d$ boundary that is exposed and can be conveniently probed in many experimental platforms. In particular, we mainly discuss boundary criticality of two examples: i...

Farias, M. Belén Zyuzin, Alexander A. Schmidt, Thomas L.

We study the Casimir effect in a system composed of two Weyl semimetals (WSMs) separated by a gap filled with a chiral medium. We calculate the optical response of the material to chiral photons in order to calculate the Casimir force. We find that if the medium between the two WSMs is a Faraday material, a repulsive Casimir force can be obtained, ...

Tichai, Alexander Roth, Robert Duguet, Thomas

In recent years many-body perturbation theory encountered a renaissance in the field of ab initio nuclear structure theory. In various applications it was shown that perturbation theory, including novel flavors of it, constitutes a useful tool to describe atomic nuclei, either as a full-fledged many-body approach or as an auxiliary method to suppor...

Riegler, Werner Windischhofer, Philipp

This report discusses a signal theorem for charged particle detectors where the finite propagation time of the electromagnetic waves produced by a moving charge cannot be neglected. While the original Ramo-Shockley theorem and related extensions are all based on electrostatic or quasi-electrostatic approximations, the theorem presented in this repo...

Ueda, Hiroshi Okunishi, Kouichi Harada, Kenji Krčmár, Roman Gendiar, Andrej Yunoki, Seiji Nishino, Tomotoshi

We investigate the Berezinskii-Kosterlitz-Thouless transitions for the square-lattice six-state clock model with the corner-transfer matrix renormalization group (CTMRG). Scaling analyzes for effective correlation length, magnetization, and entanglement entropy with respect to the cutoff dimension $m$ at the fixed point of CTMRG provide transition ...

Bagchi, Bijan Ghosh, Rahul Goswami, Partha

We show in this paper that the basic representations of position and momentum in a quantum mechanical system, that are guided by a generalized uncertainty principle and lead to a corresponding one-parameter eigenvalue problem, can be interpreted in terms of an extended Sch\"{r}odinger equation embodying momentum-dependent mass. Some simple conseque...

Ufrecht, Christian Di Pumpo, Fabio Friedrich, Alexander Roura, Albert Schubert, Christian Schlippert, Dennis Rasel, Ernst M. Schleich, Wolfgang P. Giese, Enno

Light-pulse atom interferometers constitute powerful quantum sensors for inertial forces. They are based on delocalised spatial superpositions and the combination with internal transitions directly links them to atomic clocks. Since classical tests of the gravitational redshift are based on a comparison of two clocks localised at different position...

Chirayath, V.A. Gladen, R.W. McDonald, A.D. Fairchild, A.J. Joglekar, P.V. Satyal, S. Lim, Z.H. Shead, T.N. Chrysler, M.D. Mukherjee, S.
...

Here we describe an advanced multi functional, variable-energy positron beam system capable of measuring the energies of multiple positron-induced electrons in coincidence with the Doppler-shifted gamma photon resulting from the annihilation of the correlated positron. The measurements were carried out using the unique characteristics of the digita...

Martin-Martinez, Eduardo Perche, T. Rick Torres, Bruno de S. L.

We propose a fully covariant model for smeared particle detectors in quantum field theory in curved spacetimes. We show how effects related to accelerated motion of the detector and the curvature of spacetime influence the way different observers assign an interaction Hamiltonian between the detector and the field. The fully covariant formulation e...