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Laboratory for Micro and Nanotechnology

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CDW based memory devices

CDW_Mem

1T-TaS2 is an example of a layered transition metal dichalcogenide, which exhibits a variety of thermodynamic equilibrium states, ranging from metallic at high temperature, incommensurate and nearly commensurate charge density wave (CDW) states at intermediate temperatures and an insulating commensurate CDW Mott state below 180 Kelvin. In addition, superconductivity [1] and spin liquid states [2] are found when pressure is applied or if the material is cooled to low temperatures, respectively. Finally, a variety of long-lived metastable photo- and electrically-induced states are found, which are stable at low temperatures [3-6].

In this project, we investigate the photo- and electrically-induced topologically protected hidden (H) state, which has a few orders of magnitude lower resistivity than the thermodynamically stable CDW state and is stable at low temperatures [3]. The transition time to the photoinduced state is below half a picosecond, making the material an ideal candidate for ultrafast low energy non-volatile memory device [7]. We work in collaboration with the Jozef Stefan Institute (JSI) in Ljubljana, where the material is synthesized and characterized using optical methods and scanning tunneling microscopy. We are using the state-of-the-art cleanroom facilities at PSI to prepare the samples for measurements with x-rays from PSI’s accelerator-based photon sources to shine light on the nonequilibrium states in 1T-TaS2 using reciprocal space analysis.

Project members

Jan Ravnik
Dr. Jan Ravnik
+41 56 310 51 57
jan.ravnik@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 Technologies" a.i.

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

Head of Laboratory for Micro and Nanotechnology (LMN) a.i.
Group Leader “Advanced Lithography and Metrology“

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

[1] B. Sipos, H. Berger, L. Forro, E. Tutis, A. F. Kusmartseva, Nature Materials 2008, 7, 960.

[2] M. Klanjsek, A. Zorko, R. Zitko, J. Mravlje, Z. Jagličić, P. K. Biswas, P. Prelovsek, D. Mihailović, D. Arčon, Nat Phys 2017, 13, 1130.

[3] L. Stojchevska, I. Vaskivskyi, T. Mertelj, P. Kusar, D. Svetin, S. Brazovskii, D. Mihailovic, Science 2014, 344, 177.

[4] I. Vaskivskyi, J. Gospodaric, S. Brazovskii, D. Svetin, P. Sutar, E. Goreshnik, I. A. Mihailovic, T. Mertelj, D. Mihailovic, Science Advances 2015, 1, e1500168.

[5] I. Vaskivskyi, I. A. Mihailovic, S. Brazovskii, J. Gospodaric, T. Mertelj, D. Svetin, P. Sutar, D. Mihailovic, Nat Comms 2016, 7, 11442.

[6] Y. A. Gerasimenko, I. Vaskivskyi, M. Litskevich, J. Ravnik, J. Vodeb, M. Diego, V. Kabanov, D. Mihailovic, Nat. Mat. 2019, 317, 505. 

[7] J. Ravnik, I. Vaskivskyi, T. Mertelj, D. Mihailović, Phys Rev B 2018, 97, e1400173.

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Contact

Dr. Simon Gerber

Laboratory for Micro-
and Nanotechnology
Paul Scherrer Institut
5232 Villigen PSI
Switzerland

Telephone:
+41 56 310 
Telefax:
+41 56 210 2646
E-mail:
simon.gerber@psi.ch
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