# BPeak and TLSs - P





## Turlakov 2004 [Universal sound absorption in low-temperature glasses](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/4465/Low-temperature%2Bglasses%2BTurlakov%2B2003.pdf)
M. Turlakov, Phys. Rev. Lett., 93, 035501, (2004). 
^
> Phenomenologically assuming a sharp decrease of shear relaxation time for large wavevector k > kξ
> density modes (where kξ is of order of inverse of several interatomic distances a), I develop a general



## 2020 [A new paradigm for the low-T glassy-like thermal properties of solids](https://arxiv.org/pdf/2008.01407.pdf)

> **New experimental and theoretical observations have questioned the origin of the boson peak and the linear in T specific heat exclusively from disorder and TLS.**

- [Hydrodynamics of disordered marginally stable matter](https://journals.aps.org/prresearch/pdf/10.1103/PhysRevResearch.1.012010)

> The linear in T behavior in the specific heat is stronger as the modes are more localized and crosses over to a $T^3$ (Debye) regime at a temperature $T^\star \sim \sqrt{ v^3/D}$, where v is the speed of sound.


## 2007 [Vibrational instability, two-level systems, and the boson peak in glasses](https://core.ac.uk/download/pdf/34939243.pdf)
D. A. Parshin

> In summary, we have shown that **the same physical mechanism is fundamental for such seemingly different phenomena** as the formation of the two-level systems in glasses and the boson peak in the reduced density of low-frequency
> vibrational states. In this way, **two of the most fundamental properties of glasses are interconnected

> In our theory, it follows naturally. The physical reason for the small value of the parameter C is that only a small fraction of all created TLS’s can actually tunnel in realistic time scales.

- https://arxiv.org/pdf/0711.0461.pdf

https://arxiv.org/pdf/cond-mat/0203165.pdf


- 2022 [Boson-peak vibrational modes in glasses feature hybridized phononic and quasilocalized excitations](https://arxiv.org/pdf/2210.10326.pdf)⏎
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# Parents

* Soft modes - Parshin, Gurevich
* Boson peak in glasses
* Defects/&TLSs and glass transition

# Attachments

* [](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5485/ir%2Bis%2Bbp.pdf)
* [](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5542/ruocco.pdf)