Idan Tamir Weizmann Institute of Science Collaborators M Ovadia D Kalok S Mitra B Sacepe and D Shahar httparxivorgabs14067510 International Workshop Localization Interactions and ID: 319786
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Slide1
A Finite-Temperature Insulator?
Idan Tamir
Weizmann Institute of Science
Collaborators - M.
Ovadia
, D.
Kalok
,
S.
Mitra
, B.
Sacepe
and D.
Shahar
http://arxiv.org/abs/1406.7510
International
Workshop
Localization, Interactions and
Superconductivity
Chernogolovka
, Russia, June 29 - July 3, 2015Slide2
P. W. Anderson, Phys. Rev. 109, 1492 (1958)
Gornyi
, I. V., Mirlin, A. D. & Polyakov, D. G. Phys. Rev. Lett. 95, 206603 (2005)Basko, D. M., Aleiner, I. L. & Altshuler, B. L. Annals of Phys. 321, 1126 (2006)Oganesyan, V. & Huse, D. A. Phys. Rev. B 75, 155111 (2007)
Many Body Localization (MBL)
Interacting
electrons
Disordered
Low-dimensional
Electrons are decoupled
from any external bath Slide3
Interacting
electrons
DisorderedLow-dimensionalWeak e-ph coupling
Basko, D. M.,
Aleiner, I. L. & Altshuler, B. L. Phys. Rev. B 76, 052203 (2007).Cold atoms: Schreiber
,
M.,
Hodgman
, S. S., Bordia, P., Lüschen, H. P., Fischer, M. H., Vosk, R., Altman, E., Schneider, U., Bloch, I. eprint arXiv:1501.05661
Bi-stable
I-V curve
Experimental
R
equirements for Observation of MBLSlide4
a:InO
Hebard
, A. F. & Paalanen, M. A. Phys. Rev. Lett. 65, 927 (1990)Yazdani, A. & Kapitulnik, Phys. Rev. Lett. 74, 3037 (1995)Slide5
Observation of Bi-stable I-V
curves in a:InOG. Sambandamurthy, L. W. Engel, A. Johansson, E. Peled, and D. Shahar Phys. Rev. Lett. 94, 017003 (2005)Baturina, T. I., Mironov, A. Y.,
Vinokur, V. M., Baklanov, M. R. & Strunk, C. Phys. Rev. Lett. 99, 257003 (2007)
T=10
mKSlide6
Bi-stable I-V
curvesOverheated Electrons Model M. Ovadia, B. Sacepe, and D. Shahar, Phys. Rev. Lett. 102, 176802 (2009)B. L.
Altshuler, V. E. Kravtsov, I. V. Lerner, and I. L. Aleiner, Phys. Rev. Lett. 102, 176803 (2009
)
Simulated data
Electrons are weakly coupled to the phonons Slide7
a:InO a Possible Finite Temperature Insulator
Disordered
Low-dimensionalInteracting electronsWeak e-ph coupling
Disordered
Low-dimensional
Weak e-
ph
coupling
Interacting electrons
Cooper pairs
Feigel’man
, M. V.,
Ioffe
, L. B. &
M´ezard
, M
.
Phys
. Rev. B 82, 184534 (2010
)Slide8
Earlier Studies Measured Activation
Sambandamurthy
, G., Engel, L. W., Johansson, A. & Shahar, D.
Phys. Rev. Lett. 92, 107005 (2004
).
Slide9
An Effort to Measure Higher
R
Fix T and B
Wait 1 hourRamp V
Wait 10 secondsMeasure IExtrapolate the scan to V=0
Determine
R
Slide10
The
Results
ActivationSlide11
Variable Range Hopping Transport at High Magnetic Fields
VRHSlide12
Conductivity
Near
B
c
Resistance Near
B
c
B
CSlide13
Fit Parameters
B
CSlide14
MBL?Slide15
Current
NoiseSlide16
Activated conductivity
T (K)Slide17
Alternative to Finite-
T
Insulator
T.I.
Baturina
, V.M.
Vinokur
, Annals
of Physics 331 (2013)Slide18
R vs. B
B
c