PLEASE NOTE: TODAY's TALK HAS BEEN MOVED TO 56-114
From: Catherine M Bourgeois [mailto:cmbourg@MIT.EDU]
Sent: Thursday, November 14, 2013 9:38 AM
To: 'efrc-all(a)mit.edu'
Subject: FW: Excitonics Seminar - Leonid Levitov - TODAY, 3 pm, RM 6-233
_________________________________
Center for Excitonics Seminar Series
Thursday, Nov 14, 2013
3:00 - 4:00 PM
Amdur Conference Room: 6-233 *
Energy Waves and Plasmons in Graphene
Leonid Levitov, Dept. Of Physics, MIT
Abstract:
Materials in which heat and entropy can be transmitted by directed ballistic pulses, are
of keen interest and importance both scientifically and technologically. Scientifically,
they enable fundamentally new unconventional modes of energy transfer which rely on
collective wave-like behavior akin to light or sound propagation. Technologically,
directed ballistic heat pulses can trigger new approaches to energy transduction in
solids. Collective wave-like energy transfer has been predicted for relativistic matter
under extreme conditions (cosmic sound). This talk will discuss an electronic analog of
cosmic sound that can be realized in the thermal electron-hole plasma in graphene. The new
behavior originates from rapid exchange of energy and momentum in particle collisions
leading to energy propagation as a collective weakly damped oscillation. Due to the
electronic nature of this mode, the estimated propagation velocity can be orders of
magnitude faster than that for previously studied phonon mechanisms. The energy mode is
uncharged at charge neutrality, but becomes coupled to charge dynamics upon doping. This
coupling, combined with the techniques developed recently to study plasmons in nanosystems
such as carbon nanotubes and graphene, can be employed for an all-electric excitation and
detection of energy transport.
This talk will also briefly discuss several other topics of interest concerning plasmons,
hot carriers and excitons in atomically thin layered materials: multiple carrier
generation in the photo-excitation cascade, plasmon generation in the presence of a DC
current (electronic flute), exciton Berry's phase, topological currents and anomalous
Hall transport.
Bio
Leonid Levitov received his M.A. in Physics cum laude at Moscow Physical-Technical
Institute in 1985 and his Ph.D. in Theoretical Physics at Landau Institute in 1989. He
pioneered in the theory of quasicrystals, orderly materials with non-crystallographic
symmetries, discovered in 1985 and in the theory of quantum noise in coherent electron
transport. He also developed theory of electronic properties of graphene, in particular,
new device concepts based on common-path interference and Klein tunneling, and theory of
spin Hall effect which explained the giant nonlocality observed in graphene. He has
published over a 100 refereed papers and reviews in the fields of quantum transport,
solid-state quantum computing, cold atoms, quantum noise, growth and pattern formation.
Currently, he is a Professor of Physics at MIT and leads the Condensed Matter Theory
Research Group.
The Center for Excitonics is an Energy Frontier Research Center funded by the U.S.
Department of Energy, Office of Science and Office of Basic Energy Sciences
Light refreshments will be served.
Please note location: Amdur Conference Room: 6-233 *
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Another reminder...
PLEASE NOTE: TODAY's TALK HAS BEEN MOVED TO 56-114
From: Catherine M Bourgeois [mailto:cmbourg@MIT.EDU]
Sent: Thursday, November 14, 2013 9:38 AM
To: 'efrc-all(a)mit.edu'
Subject: FW: Excitonics Seminar - Leonid Levitov - TODAY, 3 pm, RM 6-233
_________________________________
Center for Excitonics Seminar Series
Thursday, Nov 14, 2013
3:00 - 4:00 PM
Amdur Conference Room: 6-233 *
Energy Waves and Plasmons in Graphene
Leonid Levitov, Dept. Of Physics, MIT
Abstract:
Materials in which heat and entropy can be transmitted by directed ballistic pulses, are
of keen interest and importance both scientifically and technologically. Scientifically,
they enable fundamentally new unconventional modes of energy transfer which rely on
collective wave-like behavior akin to light or sound propagation. Technologically,
directed ballistic heat pulses can trigger new approaches to energy transduction in
solids. Collective wave-like energy transfer has been predicted for relativistic matter
under extreme conditions (cosmic sound). This talk will discuss an electronic analog of
cosmic sound that can be realized in the thermal electron-hole plasma in graphene. The new
behavior originates from rapid exchange of energy and momentum in particle collisions
leading to energy propagation as a collective weakly damped oscillation. Due to the
electronic nature of this mode, the estimated propagation velocity can be orders of
magnitude faster than that for previously studied phonon mechanisms. The energy mode is
uncharged at charge neutrality, but becomes coupled to charge dynamics upon doping. This
coupling, combined with the techniques developed recently to study plasmons in nanosystems
such as carbon nanotubes and graphene, can be employed for an all-electric excitation and
detection of energy transport.
This talk will also briefly discuss several other topics of interest concerning plasmons,
hot carriers and excitons in atomically thin layered materials: multiple carrier
generation in the photo-excitation cascade, plasmon generation in the presence of a DC
current (electronic flute), exciton Berry's phase, topological currents and anomalous
Hall transport.
Bio
Leonid Levitov received his M.A. in Physics cum laude at Moscow Physical-Technical
Institute in 1985 and his Ph.D. in Theoretical Physics at Landau Institute in 1989. He
pioneered in the theory of quasicrystals, orderly materials with non-crystallographic
symmetries, discovered in 1985 and in the theory of quantum noise in coherent electron
transport. He also developed theory of electronic properties of graphene, in particular,
new device concepts based on common-path interference and Klein tunneling, and theory of
spin Hall effect which explained the giant nonlocality observed in graphene. He has
published over a 100 refereed papers and reviews in the fields of quantum transport,
solid-state quantum computing, cold atoms, quantum noise, growth and pattern formation.
Currently, he is a Professor of Physics at MIT and leads the Condensed Matter Theory
Research Group.
The Center for Excitonics is an Energy Frontier Research Center funded by the U.S.
Department of Energy, Office of Science and Office of Basic Energy Sciences
Light refreshments will be served.
Please note location: Amdur Conference Room: 6-233 *