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19 April 2024 |
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Article overview
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Absence of dissipationless transport in clean 2D superconductors | | A. Benyamini
; E.J. Telford
; D.M. Kennes
; D. Wang
; A. Williams
; K. Watanabe
; T. Taniguchi
; J. Hone
; C.R. Dean
; A.J. Millis
; A.N. Pasupathy
; | | Date: |
27 Jan 2019 | | Abstract: | Dissipationless charge transport is one of the defining properties of
superconductors (SC). The interplay between dimensionality and disorder in
determining the onset of dissipation in SCs remains an open theoretical and
experimental problem. In this work, we present measurements of the dissipation
phase diagrams of SCs in the two dimensional (2D) limit, layer by layer, down
to a monolayer in the presence of temperature (T), magnetic field (B), and
current (I) in 2H-NbSe2. Our results show that the phase-diagram strongly
depends on the SC thickness even in the 2D limit. At four layers we can define
a finite region in the I-B phase diagram where dissipationless transport exists
at T=0. At even smaller thicknesses, this region shrinks in area. In a
monolayer, we find that the region of dissipationless transport shrinks towards
a single point, defined by T=B=I=0. In applied field, we show that
time-dependent-Ginzburg-Landau (TDGL) simulations that describe dissipation by
vortex motion, qualitatively reproduce our experimental I-B phase diagram.
Last, we show that by using non-local transport and TDGL calculations that we
can engineer charge flow and create phase boundaries between dissipative and
dissipationless transport regions in a single sample, demonstrating control
over non-equilibrium states of matter. | | Source: | arXiv, 1901.9310 | | Services: | Forum | Review | PDF | Favorites | |
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