Observation of transient trion induced by ultrafast charge transfer in graphene/MoS2 heterostructure
Chen Wang,
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Y. F. Chen,
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Qiushi Ma
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et al.
Applied Physics Letters,
Journal Year:
2025,
Volume and Issue:
126(4)
Published: Jan. 27, 2025
Van
der
Waals
(vdW)
heterostructures
constructed
from
transition
metal
dichalcogenidess
provide
an
ideal
platform
for
exploring
various
quasiparticle
behaviors,
with
trion—composed
of
neutral
exciton
and
charged
carrier—being
a
notable
example.
There
are
typically
three
methods
to
generate
trion:
electrical
doping,
chemical
direct
optical
doping.
The
first
two
static
trion,
while
the
last
gives
rise
transient
trion.
Here,
we
present
indirect
doping
approach
trion
via
ultrafast
charge
transfer
(CT)
achieve
control
over
trion-to-exciton
ratio
by
adjusting
CT
in
Gr/MoS2
heterostructure.
Furthermore,
demonstrated
that
dynamics
generated
this
method,
which
shows
slightly
longer
lifetime
than
accounted
Coulomb
interactions
between
defect.
This
study
provides
fresh
perspectives
on
construction
desired
quasiparticles,
dynamical
characterization,
many-body
interaction
two-dimensional
structure.
Language: Английский
Strain fingerprinting of exciton valley character in 2D semiconductors
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Aug. 30, 2024
Intervalley
excitons
with
electron
and
hole
wavefunctions
residing
in
different
valleys
determine
the
long-range
transport
dynamics
observed
many
semiconductors.
However,
these
vanishing
oscillator
strength
do
not
directly
couple
to
light
and,
hence,
remain
largely
unstudied.
Here,
we
develop
a
simple
nanomechanical
technique
control
energy
hierarchy
of
via
their
contrasting
response
mechanical
strain.
We
use
our
discover
previously
inaccessible
intervalley
associated
K,
Γ,
or
Q
prototypical
2D
semiconductors
WSe
Language: Английский
Beyond the K-valley: exploring unique trion states in indirect band gap monolayer WSe2
npj 2D Materials and Applications,
Journal Year:
2025,
Volume and Issue:
9(1)
Published: Feb. 8, 2025
Language: Английский
Theory of biexciton polaritons in transition metal dichalcogenide monolayers
Physical review. B./Physical review. B,
Journal Year:
2025,
Volume and Issue:
111(11)
Published: March 3, 2025
Language: Английский
Probing excitons with time-resolved momentum microscopy
Advances in Physics X,
Journal Year:
2024,
Volume and Issue:
9(1)
Published: July 26, 2024
Excitons
–
two-particle
correlated
electron-hole
pairs
are
the
dominant
low-energy
optical
excitation
in
broad
class
of
semiconductor
materials,
which
range
from
classical
silicon
to
perovskites,
and
two-dimensional
organic
materials.
The
study
excitons
has
been
brought
on
a
new
level
detail
by
application
photoemission
momentum
microscopy
technique
that
dramatically
extended
capabilities
time-
angle
resolved
spectroscopy.
Here,
we
review
how
photoelectron
detection
scheme
enables
direct
access
energy
landscape
bright
dark
excitons,
and,
more
generally,
momentum-coordinate
exciton
wavefunction.
Focusing
materials
semiconductors,
first
discuss
typical
fingerprint
highlight
it
is
possible
obtain
information
not
only
electron-
but
also
hole-component.
Second,
focus
recent
orbital
tomography
such
this
provides
unique
real-space
properties
We
studies
performed
transition
metal
dichalcogenides
semiconductors
lead
very
similar
conclusions,
manner,
strength
for
excitations
semiconductors.
Language: Английский
Ultrafast switching of trions in 2D materials by terahertz photons
Nature Photonics,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 23, 2024
Language: Английский
Electrically tunable layer-hybridized trions in doped WSe2 bilayers
Raül Perea‐Causín,
No information about this author
Samuel Brem,
No information about this author
Fabian Buchner
No information about this author
et al.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Aug. 7, 2024
Abstract
Doped
van
der
Waals
heterostructures
host
layer-hybridized
trions,
i.e.
charged
excitons
with
layer-delocalized
constituents
holding
promise
for
highly
controllable
optoelectronics.
Combining
a
microscopic
theory
photoluminescence
(PL)
experiments,
we
demonstrate
the
electrical
tunability
of
trion
energy
landscape
in
naturally
stacked
WSe
2
bilayers.
We
show
that
an
out-of-plane
electric
field
modifies
energetic
ordering
lowest
lying
states,
which
consist
$$\Lambda$$
Λ
-point
electrons
and
layer-localized
K-point
holes.
At
small
fields,
intralayer-like
trions
yield
distinct
PL
signatures
opposite
doping
regimes
characterized
by
weak
Stark
shifts
both
cases.
Above
doping-asymmetric
critical
field,
interlayer-like
species
are
energetically
favored
produce
peaks
pronounced
red-shift
counter-intuitively
large
intensity
arising
from
efficient
phonon-assisted
recombination.
Our
work
presents
important
step
forward
understanding
paves
way
towards
optoelectronic
applications
based
on
electrically
atomically-thin
semiconductors.
Language: Английский
Stacking order dependence of interlayer excitons in MoSe2/WSe2 heterobilayers
Physical review. B./Physical review. B,
Journal Year:
2024,
Volume and Issue:
110(4)
Published: July 8, 2024
Two-dimensional
transition
metal
dichalcogenide
heterostructures
provide
a
unique
opportunity
for
quantum
engineering
of
electronic
and
excitonic
states
at
the
nanoscale.
Critical
optical
properties
interlayer
excitons,
including
energy,
selectivity,
yield,
are
strongly
correlated
to
stacking
orders.
However,
these
could
vary
from
sample
sample,
setting
an
obstacle
extracting
intrinsic
order
dependence
experimentally.
We
report
effective
method
fabricate
heterobilayers
with
both
orders
obtained
on
single
device.
The
sharp
difference
excitons
induced
by
was
unambiguously
identified,
emission
wavelength,
valley
polarization,
temperature
yield.
This
provides
flexible
platform
study
heterobilayer
can
be
readily
applied
explore
layer
hybridization,
strong
correlations,
exciton
diffusion
that
sensitive
order.
Language: Английский