Physical Review Letters,
Journal Year:
2024,
Volume and Issue:
132(23)
Published: June 4, 2024
Recent
experiments
have
confirmed
the
presence
of
interlayer
excitons
in
ground
state
transition
metal
dichalcogenide
bilayers.
The
are
expected
to
show
remarkable
transport
properties
when
they
undergo
Bose
condensation.
In
this
Letter,
we
demonstrate
that
quantum
geometry
Bloch
wave
functions
plays
an
important
role
phase
stiffness
exciton
condensate.
Notably,
identify
a
geometric
contribution
amplifies
stiffness,
leading
formation
robust
condensate
with
increased
Berezinskii-Kosterlitz-Thouless
temperature.
Our
results
direct
implications
for
ongoing
experimental
efforts
on
materials
nontrivial
geometry.
We
provide
estimates
bilayers
through
realistic
continuum
model
gated
Coulomb
interaction,
and
find
substantially
may
allow
be
realized
at
amenable
conditions.
Flat
band
systems
such
as
twisted
bilayer
graphene
superconduct
thanks
to
nontrivial
wave
functions.
The
work
here
relates
the
superfluid
weight
and
Cooper
pair
mass
in
isolated
flat
bands
new
concept
of
minimal
quantum
metric,
solving
an
underappreciated,
yet
crucial
issue
previous
work.
Moreover,
authors
demonstrate
that
do
not
need
be
energetically
maximize
critical
temperature,
showing
many
more
materials
are
candidates
for
superconductivity
at
elevated
temperatures.
Physical Review Letters,
Journal Year:
2023,
Volume and Issue:
131(24)
Published: Dec. 11, 2023
Quantum
geometry
defines
the
phase
and
amplitude
distances
between
quantum
states.
The
distance
is
characterized
by
Berry
curvature
thus
relates
to
topological
phenomena.
significance
of
full
geometry,
including
metric,
has
started
receive
attention
in
last
few
years.
Various
transport
interaction
phenomena
have
been
found
be
critically
influenced
geometry.
For
example,
allows
counterintuitive
flow
supercurrent
a
flat
band
where
single
electrons
are
immobile.
In
this
Essay,
I
will
discuss
my
view
important
open
problems
future
applications
research
topic
try
inspire
reader
come
up
with
further
ideas.
At
its
best,
can
new
chapter
theory
lead
breakthroughs
as
transformative
room-temperature
superconductivity.
However,
first,
more
experiments
directly
showing
effect
needed.
We
also
integrate
analysis
our
most
advanced
numerical
methods.
Further,
ramifications
should
studied
wider
range,
electric
electromagnetic
responses
free-
correlated-electron
materials,
bosonic
systems,
optics,
other
fields.
Part
series
Essays
which
concisely
present
author
visions
for
their
field.Received
17
November
2023DOI:https://doi.org/10.1103/PhysRevLett.131.240001Published
American
Physical
Society
under
terms
Creative
Commons
Attribution
4.0
International
license.
Further
distribution
work
must
maintain
attribution
author(s)
published
article's
title,
journal
citation,
DOI.Published
SocietyPhysics
Subject
Headings
(PhySH)Research
AreasChern
insulatorsDensity
matrix
renormalization
groupFlat
bandsGeometric
&
phasesPolaritonsPhysical
SystemsNon-Hermitian
systemsStrongly
correlated
systemsSuperconductorsTopological
materialsTechniquesDensity
functional
theoryDynamical
mean
field
theoryQuantum
Monte
CarloCondensed
Matter,
Materials
Applied
Physics
Reviews of Modern Physics,
Journal Year:
2024,
Volume and Issue:
96(1)
Published: Feb. 7, 2024
Friction
at
highly
lubric
interfaces
of
two-dimensional
materials
is
important
yet
incompletely
characterized.
This
Colloquium
discusses
sliding
and
pinning
between
layers,
using
simulations
twisted
graphene
as
a
prototypical
system.
The
resulting
insights
are
potential
relevance
for
larger
category
bilayer
multilayer
systems
well.
Chemical Reviews,
Journal Year:
2024,
Volume and Issue:
124(4), P. 1992 - 2079
Published: Feb. 9, 2024
Twisted
van
der
Waals
(vdW)
quantum
materials
have
emerged
as
a
rapidly
developing
field
of
two-dimensional
(2D)
semiconductors.
These
establish
new
central
research
area
and
provide
promising
platform
for
studying
phenomena
investigating
the
engineering
novel
optoelectronic
properties
such
single
photon
emission,
nonlinear
optical
response,
magnon
physics,
topological
superconductivity.
captivating
electronic
result
from,
can
be
tailored
by,
interlayer
coupling
using
moiré
patterns
formed
by
vertically
stacking
atomic
layers
with
controlled
angle
misorientation
or
lattice
mismatch.
Their
outstanding
high
degree
tunability
position
them
compelling
building
blocks
both
compact
quantum-enabled
devices
classical
optoelectronics.
This
paper
offers
comprehensive
review
recent
advancements
in
understanding
manipulation
twisted
structures
presents
survey
state-of-the-art
on
superlattices,
encompassing
interdisciplinary
interests.
It
delves
into
fundamental
theories,
synthesis
fabrication,
visualization
techniques,
wide
range
physical
exhibited
these
structures,
focus
their
potential
practical
device
integration
applications
ranging
from
information
to
biosensors,
including
optoelectronics
modulators,
light
emitting
diodes,
lasers,
photodetectors.
highlights
unique
ability
superlattices
connect
multiple
disciplines,
covering
chemistry,
electronics,
optics,
photonics,
magnetism,
physics.
provides
valuable
resource
researchers
interested
shedding
characteristics
transformative
various
fields.
