scholarly journals Anomalous low-energy properties in amorphous solids and the interplay of electric and elastic interactions of tunneling two-level systems

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Alexander Churkin ◽  
Shlomi Matityahu ◽  
Andrii O. Maksymov ◽  
Alexander L. Burin ◽  
Moshe Schechter
Keyword(s):  
Amorphous Solids ◽  
Low Energy ◽  
Elastic Interactions ◽  
Two Level Systems

GLASSY BEHAVIOR OF YBa2Cu3O7

1988 ◽  
Vol 02 (11n12) ◽  
pp. 1327-1333 ◽  
Author(s):  
A. SAHLING ◽  
S. SAHLING
Keyword(s):  
Heat Capacity ◽  
Temperature Dependence ◽  
Density Of States ◽  
Equilibrium Temperature ◽  
Amorphous Solids ◽  
Acoustic Measurements ◽  
Rapid Cooling ◽  
Glassy Behavior ◽  
Long Time ◽  
Two Level Systems

Long time power released in YBa 2 Cu 3 O 7 after rapid cooling from equilibrium temperature T1 (2.35 K≤T≤15.11 K ) to T0=1.5 K and heat capacity (1.2 K ≤T≤100 K ) were measured. The observed time and temperature dependence of the power release is similar to those of amorphous solids. The resulting density of states of two-level systems is close to the values obtained from heat capacity and acoustic measurements.

scholarly journals Polaronic model of two-level systems in amorphous solids

2013 ◽  
Vol 87 (14) ◽  
Author(s):  
Kartiek Agarwal ◽  
Ivar Martin ◽  
Mikhail D. Lukin ◽  
Eugene Demler
Keyword(s):  
Amorphous Solids ◽  
Two Level Systems

On the Nature of the Distribution Function for Two-Level Systems in Amorphous Solids

1989 ◽  
Vol 154 (2) ◽  
pp. K107-K112 ◽  
Author(s):  
Subrata Mukherjee ◽  
S. Sengupta ◽  
A. N. Basu
Keyword(s):  
Distribution Function ◽  
Amorphous Solids ◽  
Two Level Systems

scholarly journals Towards understanding two-level-systems in amorphous solids: insights from quantum circuits

2019 ◽  
Vol 82 (12) ◽  
pp. 124501 ◽  
Author(s):  
Clemens Müller ◽  
Jared H Cole ◽  
Jürgen Lisenfeld
Keyword(s):  
Amorphous Solids ◽  
Quantum Circuits ◽  
Two Level Systems

scholarly journals New paradigm for glassy-like anomalies in solids from fundamental symmetries

2021 ◽  
Vol 35 (04) ◽  
pp. 2130002
Author(s):  
Matteo Baggioli ◽  
Alessio Zaccone
Keyword(s):  
Specific Heat ◽  
Disordered Systems ◽  
Low Energy ◽  
Disordered Materials ◽  
New Paradigm ◽  
Fundamental Symmetries ◽  
Incommensurate Structures ◽  
Two Level Systems ◽  
Diffusive Modes ◽  
Disordered Compounds

Glasses and disordered materials are known to display anomalous features in the density of states, in the specific heat and in thermal transport. Nevertheless, in recent years, the question whether these properties are really anomalous (and peculiar of disordered systems) or rather more universal than previously thought, has emerged. New experimental and theoretical observations have questioned the origin of the boson peak (BP) and the linear in T specific heat exclusively from disorder and two-level systems (TLS). The same properties have been indeed observed in ordered or minimally disordered compounds and in incommensurate structures for which the standard explanations are not applicable. Using the formal analogy between phason modes (e.g., in quasicrystals and incommensurate lattices) and diffusions, and between amplitude modes and optical phonons, we suggest the existence of a more universal physics behind these properties. In particular, we strengthen the idea that linear in T specific heat is linked to low energy diffusive modes resulting from fundamental symmetries, and that a BP excess can be induced in crystals either by gapped optical-like modes and/or by anharmonic diffusive (Akhiezer) damping.

Heterogeneous Interactions Promote Crystallization and Spontaneous Resolution of Chiral Molecules

2019 ◽  
Author(s):  
John Carpenter ◽  
Michael Gruenwald
Keyword(s):  
Molecular Dynamics ◽  
Free Energy ◽  
Crystallization Behavior ◽  
Amorphous Solids ◽  
Spontaneous Resolution ◽  
Low Energy ◽  
Coarse Grained ◽  
Chiral Molecules ◽  
Racemic Mixtures ◽  
Heterogeneous Interactions

Predicting the crystallization behavior of solutions of chiral molecules is a major challenge in the chemical sciences. In this paper, we use molecular dynamics computer simulations to study the crystallization of a family of coarse-grained models of chiral molecules with a broad range of molecular shapes and interactions. Our simulations reproduce the experimental crystallization behavior of real chiral molecules, including racemic and enantiopure crystals, as well as amorphous solids. Using efficient algorithms for the packing of shapes, we enumerate millions of low energy crystal structures for each model and analyze the thermodynamic landscape of polymorphs. In agreement with recent conjectures, our analysis shows that the ease of crystallization is largely determined by the number of competing polymorphs with low free energy. We find that this number, and hence crystallization outcomes, depend on molecular interactions in a simple way: Strongly heterogeneous interactions across molecules promote crystallization and favor the spontaneous resolution of racemic mixtures.

Sign in / Sign up

Export Citation Format

Share Document