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Van der Waals materials & devices

CDW_Mem

Electronic properties of Van der Waals (VdW) materials can be influenced by external parameters such as the stacking order, gating and the twist angle between the sheets. The latter introduces a new moiré superlattice structure in real space along with flat energy bands and a high density of states in reciprocal space which can give rise to collective behavior and exotic ground states. Hence, twisted VdW devices are an ideal platform to engineer quantum many-body states to study strongly correlated physics and topology.

1T-TaS2 is a layered transition metal dichalcogenide, which exhibits a variety of equilibrium states, ranging from metallic at high temperature, a series of charge-density wave (CDW) states at intermediate temperatures and an insulating Mott state below 180 Kelvin. Intriguingly, a variety of long-lived metastable photo- and electrically-induced states are found, which are stable at low temperatures. Combining the knowledge of these equilibrium and non-equilibrium phases with a moiré potential via twisting allows us to increase electron correlations and opens the door to induce new ground states.

In this project, we investigate the photo- and electrically-induced so-called “hidden” state of 1T-TaS2, which has orders of magnitude lower resistivity than the thermodynamically stable insulating low-temperature state. The transition to this photoinduced state occurs on sub-picosecond timescale, making the material an ideal candidate for ultrafast low-energy non-volatile memory devices. We work in collaboration with the Jozef Stefan Institute where the material is synthesized and characterized using optical methods and scanning tunneling microscopy. For device fabrication, we use PSI’s state-of-the-art cleanroom facilities and employ synchrotron and X-ray free-electron laser techniques to shine light on the equilibrium and non-equilibrium physics.

Recent publications

Charge configuration memory devices: energy efficiency and switching speed
A. Mraz, R. Venturini, D. Svetin, V. Sever, I. A. Mihailovic, I. Vaskivskyi, B. Ambrozic, G. Dražić, M. D’Antuono, D. Stornaiuolo, F. Tafuri, D. Kazazis, J. Ravnik, Y. Ekinci, D. Mihailovic
Nano Lett. 22, 4814 (2022)

Recent highlights

21 juin 2021
Quantum billiard

Quantum billiards with correlated electrons

Our collaborators at the Jozef Stefan Institute – the leading author, Jan Ravnik, is now a PSI Fellow at LMN – report a study of the electron ordering in equilateral triangle structures via photoexcitation of the prototypical dichalcogenide 1T-TaS2.

En savoir plus
21 avril 2021
Time domain phase diagram of 1T-TaS2

A time-domain phase diagram of metastable quantum states

Our collaborators at the Jozef Stefan Institute – the leading author, Jan Ravnik, is now a PSI Fellow at LMN – report a ‘dynamical’ phase diagram of metastable quantum states generated via photoexcitation of the prototypical dichalcogenide material 1T-TaS2.

En savoir plus

Project members

Corinna Burri
Corinna Burri

PhD Student

+41 56 310 31 70
corinna.burri@psi.ch
F. Dizdarevic
Faris Dizdarevic

Master Student

faris.dizdarevic@psi.ch
H.Bell
Henry George Bell

Semester Project Student

henry.bell@psi.ch
HUA Nelson
Dr. Nelson Nientsu Hua
+41 56 310 51 20
nelson.hua@psi.ch
Sandy Adhitia Ekahana
Dr. Sandy Adhitia Ekahana

Postdoc
 

+41 56 310 52 76
sandy.ekahana@psi.ch
Dr. Dimitrios Kazazis

Tenure-track scientist

+41 56 310 55 78
dimitrios.kazazis@psi.ch
Simon Gerber
Dr. Simon Gerber

Group Leader "Quantum Photon Science"

+41 56 310 39 65
simon.gerber@psi.ch
Dr. Yasin Ekinci

Head of Laboratory for X-ray Nanoscience and Technologies
 

+41 56 310 28 24
yasin.ekinci@psi.ch

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Contact

Dr. Simon Gerber

Laboratory for X-ray Nanoscience and Technologies
Paul Scherrer Institut
5232 Villigen PSI
Switzerland

Telephone: +41 56 310 39 65
E-mail: simon.gerber@psi.ch
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