Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session L35: 2D Materials -Superconductivity and Charge Density Waves II
11:15 AM–2:03 PM,
Wednesday, March 7, 2018
LACC Room: 409B
Sponsoring Unit: DMP
Chair: Jun Zhu, Penn State
Abstract: L35.00010 : Quantum phase transitions in highly crystalline 2D superconductors
1:27 PM–1:39 PM
(The University of Tokyo)
Recent technological advances of thin films fabrication, especially mechanical exfoliation, led to the successful preparation[N1] of highly-crystalline two-dimensional (2D) superconductors ; Examples include atomically thin NbSe2 and ion-gated 2D crystals, which exhibit intrinsic properties of 2D superconductors with minimal disorder. In this talk, we provide a unified picture of temperature versus magnetic field phase diagram in highly crystalline 2D superconductors containing quantum phase transitions. According to the magneto-transport measurements in 2D superconducting ZrNCl and MoS2, we found that the quantum metallic state (vortex liquid)  commonly observed at low magnetic fields is converted via the quantum Griffiths state to the weakly localized metal at high magnetic fields through a quantum phase transition with the diverging critical exponent. We discuss such evolution of quantum state is generic nature of highly crystalline 2D superconductors with weak pinning potentials.
 Y. Saito et al. Nature Rev. Mat. 2, 16094 (2016),  Y. Saito et al. Science 350, 409 (2015).
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