Frolov, S.M. Manfra, M.J. Sau, J.D.

We analyze the evidence of Majorana zero modes in nanowires that came from tunneling spectroscopy and other experiments, and scout the path to topologically protected states that are of interest for quantum computing. We illustrate the importance of the superconductor-semiconductor interface quality and sketch out where further progress in material...

Lu, Shufan Shen, Jiazhou Kuhn, Steve J. Snow, W. Michael Baxter, David V. Pynn, Roger Ortiz, Gerardo

We develop an operator-based description of two types of multimode-entangled single-neutron quantum optical devices: Wollaston prisms and radio-frequency spin flippers in inclined magnetic field gradients. This treatment is similar to the approach used in quantum optics, and is convenient for the analysis of quantum contextuality measurements in ce...

Herbst, Matthew Reifenberger, Andreas Velte, Clemens Dorrer, Holger Düllmann, Christoph E. Enss, Christian Fleischmann, Andreas Gastaldo, Loredana Kempf, Sebastian Kieck, Tom
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The specific heat of dilute holmium alloys plays a major role in the optimization of low temperature microcalorimeters with enclosed $^{163}\textrm{Ho}$, such as the ones developed for the neutrino mass experiment ECHo. We investigate alloys with atomic concentrations of $x_\textrm{Ho}=0.01\,\% - 4\,\%$ at temperatures between $10\,\textrm{mK}$ and...

Wu, Weikang Yu, Zhi-Ming Zhou, Xiaoting Zhao, Y.X. Yang, Shengyuan A.

Relativistic massless Weyl and Dirac fermions exhibit the isotropic and linear dispersion relations to preserve the Pioncar\'{e} symmetry, the most fundamental symmetry in high energy physics. In solids, the counterparts of the Pioncar\'{e} symmetry are crystallographic symmetries, and hence, it is natural to explore generalizations of Dirac and We...

Askari, Alidad Marjaneh, Aliakbar Moradi Rakhmatullina, Zhanna G. Ebrahimi-Loushab, Mahdy Saadatmand, Danial Gani, Vakhid A. Kevrekidis, Panayotis G. Dmitriev, Sergey V.

The two major effects observed in collisions of the continuum $\phi^4$ kinks are (i) the existence of critical collision velocity $v_c$ above which the kinks always emerge from the collision and (ii) the existence of the escape windows for multi-bounce collisions with the velocity below $v_c$, associated with the energy exchange between the kink's ...

Julian, Matthew N. Williams, Calum Borg, Stephen Bartram, Scott Kim, Hyun Jung

Actively tunable, narrowband spectral filtering across arbitrary optical wavebands is highly desirable in a plethora of applications, from chemical sensing, hyperspectral imaging to infrared astronomy. Yet, the ability to actively reconfigure the optical properties of a solid-state narrowband filter remains elusive. Existing solutions require eithe...

Knoll, Andy Timm, Carsten Meng, Tobias

Weyl semimetals are topological materials that provide a condensed-matter realization of the chiral anomaly. A positive longitudinal magnetoconductance quadratic in magnetic field has been promoted as a diagnostic for this anomaly. By solving the Boltzmann equation analytically, we show that the magnetoconductance can become negative in the experim...

Bharadwaj, Sathwik Ram-Mohan, L.R. Rodriguez, Leo Rodriguez, Shanshan

We outline the duality between the extraordinary magnetoresistance (EMR), observed in semiconductor-metal hybrids, and non-symmetric gravity coupled to a diffusive $U(1)$ gauge field. The corresponding gravity theory may be interpreted as the generalized complex geometry of the semi-direct product of the symmetric metric and the antisymmetric Kalb-...

Nikolaev, A.V. Chtchelkatchev, N.M. Salamatin, D.A. Tsvyashchenko, A.V.

Based on ab initio band structure calculations we formulate a general theoretical method for description of the temperature dependence of electric field gradient in solids. The method employs a procedure of averaging multipole electron density component (L \neq 0) inside a sphere vibrating with the nucleus at its center. As a result of averaging ea...

Meier, Q.N. Stucky, A. Teyssier, J. Griffin, S.M. van der Marel, D. Spaldin, N.A.

Structural phase transitions described by Mexican hat potentials should in principle exhibit aspects of Higgs and Goldstone physics. Here, we investigate the relationship between the phonons that soften at such structural phase transitions and the Higgs- and Goldstone-boson analogues associated with the crystallographic Mexican hat potential. We sh...