Physics of Two-Dimensional Structures

Head

Prof. Leszek Bryja

Leszek Bryja

office: 214, A-1
phone: +48 71 320 22 57


Joanna Jadczak

Joanna Jadczak

office: 214, A-1
phone: +48 71 320 22 57

PhD Students

Ewa Żuberek

Ewa Żuberek

office: 213, A-1


Research

The group of the Physics of Two Dimensional Structures  specializes in the study of two-dimensional semiconductor structures, particularly van der Waals structures of layered materials. Our research includes both the fabrication of van der Waals structures and their investigation using advanced optical spectroscopy methods such as micro-photoluminescence, micro-photoluminescence excitation, micro-photoluminescence up-conversion, reflection contrast, transmission and micro-Raman scattering over a wide temperature range from 7 to 300 K. In addition, we characterize the surface and thickness of materials using atomic force microscopy.

The main goal of our research is to understand the many-body effects in condensed matter related to both the charge and spin of carriers, which includes studying electron-electron and electron-phonon interactions. Using various experimental techniques and aided by theoretical calculations we aim to get deeper inside into fundamental properties of condensed matter.


 

2024

Photon upconversion of defect-bound excitons in hBN-encapsulated MoS2 monolayer
Ewa Żuberek, Justyna Olejnik, Jörg Debus, Ching-Hwa Ho, Kenji Watanabe, Takashi Taniguchi, Leszek Bryja, Joanna N. Jadczak
Journal of Physical Chemistry C. 2024, vol. 128, nr 45, s. 19288-19296

2023

Biexciton and singlet trion upconvert exciton photoluminescence in a MoSe2 monolayer supported by acoustic and optical K-valley phonons
Joanna N. Jadczak, Jörg Debus, Justyna Olejnik, Ching-Hwa Ho, Kenji Watanabe, Takashi Taniguchi, Leszek Bryja
Journal of Physical Chemistry Letters. 2023, vol. 14, nr 39, s. 8702-8708

Resonant exciton scattering reveals Raman forbidden phonon modes in layered GeS
Joanna N. Jadczak, Janusz Andrzejewski, Jörg Debus, Ching-Hwa Ho, Leszek Bryja
Journal of Physical Chemistry Letters. 2023, vol. 14, nr 17, s. 3986-3994

2021

Upconversion photoluminescence excitation reveals exciton-trion and exciton-biexciton coupling in hBN/WS2/hBN van der Waals heterostructures
Ewa Żuberek, Martyna Majak, Jakub Lubczyński, Jörg Debus, Kenji Watanabe, Takashi Taniguchi, Ching-Hwa Ho, Leszek Bryja, Joanna N. Jadczak
Scientific Reports. 2022, vol. 12, art. 13699, s. [1-9]

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS2
Piotr Kapuściński, J. Dzian, Artur O. Slobodeniuk, C. Rodríguez-Fernández, Joanna N. Jadczak, Leszek Bryja, Clement Faugeras, Denis M. Basko, Marek Potemski
2D Materials. 2022, vol. 9, nr 4, art. 045005, s. 1-17

Uniaxial strain tuning of Raman spectra of a ReS2 monolayer
Iris Niehues, Thorsten Deilmann, Joanna J. Kutrowska-Girzycka, Alireza Taghizadeh, Leszek Bryja, Ursula Wurstbauer, Rudolf Bratschitsch, Joanna N. Jadczak
Physical Review. B. 2022, vol. 105, nr 20, art. 205432, s. 1-7

Upconversion of light into bright intravalley excitons via dark intervalley excitons in hBN-encapsulated WSe2 monolayers
Joanna N. Jadczak, Mikhail M. Glazov, Joanna J. Kutrowska-Girzycka, Janina Jacqueline. Schindler, Jörg Debus, Ching-Hwa Ho, Kenji Watanabe, Takashi Taniguchi, Manfred Bayer, Leszek Bryja
ACS Nano. 2021, vol. 15, nr 12 s. 19165-19174

Investigations of electron-electron and interlayer electron-phonon coupling in van der Waals hBN/WSe2/hBN heterostructures by photoluminescence excitation experiments
Joanna N. Jadczak, Joanna J. Kutrowska-Girzycka, Janina Jacqueline. Schindler, Jörg Debus, Kenji Watanabe, Takashi Taniguchi, Ching-Hwa Ho, Leszek Bryja
Materials. 2021, vol. 14, nr 2, art. 399, s. 1-12

Probing negatively charged and neutral excitons in MoS2/hBN and hBN/MoS2/hBN van der Waals heterostructures
Joanna N. Jadczak, Joanna J. Kutrowska-Girzycka, Maciej Bieniek, Tomasz Kazimierczuk, Piotr Kossacki, Janina Jacqueline. Schindler, Jörg Debus, Kenji Watanabe, Takashi Taniguchi, Ching-Hwa Ho, Arkadiusz Wójs, Paweł Hawrylak, Leszek Bryja
Nanotechnology. 2021, vol. 32, nr 14, art. 145717, s. 1-10