Embedded Files
Correlated states controlled by tunable van Hove singularity in moiré WSe2
P. Knüppel, J. Zhu, Y. Xia, Z. Xia, Z. Han, Y. Zeng, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, arXiv:2406.03315.
Experimental demonstration of correlated electronic states in twisted bilayer WSe2 (e.g. Stoner ferromagnetism, Chern insulators and metal-insulator transitions) controlled by the electric-field-tunable van Hove singularity in the material.
Unconventional superconductivity in twisted bilayer WSe2
Y. Xia, Z. Han, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, arXiv:2405.14784.
Experimental observation of superconductivity and a superconductor-to-Mott insulator transition in twisted bilayer WSe2 near moiré filling factor 1 and small displacement fields.
(Viewpoint) The fractional quantum anomalous Hall effect
L. Ju, A. H. MacDonald, K. F. Mak, J. Shan, and X. Xu, Nature Rev. Mater. 9, 455–459 (2024).
Short viewpoint on the recent discovery of fractional Chern insulators.
Observation of the double quantum spin Hall phase in moiré WSe2
K. Kang, Y. Qiu, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, arXiv:2402.04196.
Experimental demonstration of the single and double quantum spin Hall effect at moiré filling factor 2 and 4, respectively, in small-angle-twisted WSe2 bilayers.
Evidence of the fractional quantum spin Hall effect in moiré MoTe2
K. Kang, B. Shen, Y. Qiu, Y. Zeng, Z. Xia, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, Nature 628, 522–526 (2024).
Experimental demonstration of the fractional quantum spin Hall effect at moiré filling factor 3 of a small-angle-twisted MoTe2 bilayer.
A degenerate trion liquid in atomic double layers
P. X. Nguyen, R. Chaturvedi, L. Ma, P. Knüppel, K. Watanabe, T. Taniguchi, K. F. Mak, and J. Shan, arXiv:2312.12571.
Experimental demonstration of a degenerate trion liquid in thermal equilibrium in Coulomb-coupled electron-hole double layers with electron-hole density imbalance.
Emergence of ferromagnetism at the onset of moiré Kondo breakdown
W. Zhao, B. Shen, Z. Tao, S. Kim, P. Knüppel, Z. Han, Y. Zhang, K. Watanabe, T. Taniguchi, D. Chowdhury, J. Shan, and K. F. Mak, Nature Phys. in press (2024); arXiv:2310.06044.
Observation of a transition from a heavy Fermi liquid to a ferromagnetic Anderson insulator near a density-tuned Kondo breakdown in a moiré Kondo lattice system.
Perfect Coulomb drag in a dipolar excitonic insulator
P. X. Nguyen, L. Ma, R. Chaturvedi, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, arXiv:2309.14940.
Direct observation of perfect Coulomb drag and an exciton Mott transition by layer-resolved transport measurements in Coulomb-coupled electron-hole double layers.
Observation of spin polarons in a frustrated moiré Hubbard system
Z. Tao, W. Zhao, B. Shen, T. Li, P. Knüppel, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, Nature Phys. 20, 783–787 (2024).
Experimental observation of a new quasiparticle - the spin polaron - in a hole-doped triangular lattice Mott insulator with kinetic frustration.
Optical readout of the chemical potential of two-dimensional electrons
Z. Xia, Y. Zeng, B. Shen, R. Dery, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, Nature Photon. 18, 344–349 (2024).
Development of an experimental technique to optically readout the thermodynamic equations of states for an arbitrary two-dimensional material.
Valley-coherent quantum anomalous Hall state in AB-stacked MoTe2/WSe2 bilayers
Z. Tao, B. Shen, S. Jiang, T. Li, L. Li, L. Ma, W. Zhao, J. Hu, K. Pistunova, K. Watanabe, T. Taniguchi, T. F. Heinz, K. F. Mak, and J. Shan, Phys. Rev. X 14, 011004 (2024).
Layer- and helicity-resolved magneto-optical spectroscopy revealed surprisingly that the quantum anomalous Hall state in AB-stacked MoTe2/WSe2 bilayers is valley-coherent rather than valley-polarized.
Remote imprinting of moiré lattices
J. Gu, J. Zhu, P. Knüppel, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, Nature Mater. 23, 219-223 (2024).
We demonstrate the electrostatic imprinting of a moiré superlattice potential onto monolayer MoSe2 by a remote Mott insulating state in angle-aligned MoSe2/WS2 moiré bilayers; a correlated insulating state is observed in the monolayer MoSe2.
Realization of the Haldane Chern insulator in a moiré lattice
W. Zhao, K. Kang, Y. Zhang, P. Knüppel, Z. Tao, L. Li, C. Tschirhart, E. Redekop, K. Watanabe, T. Taniguchi, A. F. Young, J. Shan, and K. F. Mak, Nature Phys. 20, 275-280 (2024).
Experimental demonstration of Haldane model physics in AB-stacked MoTe2/WSe2 moiré by "splitting" a quantum spin Hall insulator into two halves.
Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers
Z. Tao, B. Shen, W. Zhao, N. C. Hu, T. Li, S. Jiang, L. Li, K. Watanabe, T. Taniguchi, A. H. MacDonald, J. Shan, and K. F. Mak, Nature Nanotech. 19, 28-33 (2024).
Observation of a giant spin Hall effect with long spin diffusion length in AB-stacked MoTe2/WSe2 using magneto-optical microscopy.
Thermodynamic evidence of fractional Chern insulator in moiré MoTe2
Y. Zeng, Z. Xia, K. Kang, J. Zhu, P. Knuppel, C. Vaswani, K. Watanabe, T. Taniguchi, K. F. Mak, and J. Shan, Nature 622, 69-73 (2023).
Experimental observation of an integer and a fractional Chern insulator under zero magnetic field in twisted bilayer MoTe2 using local thermodynamics measurement and magneto-optical spectroscopy.
Switchable moiré potentials in ferroelectric WTe2/WSe2 superlattices
K. Kang, W. Zhao, Y. Zeng, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, Nature Nanotech. 18, 861-866 (2023).
Experimental demonstration of electrical switching of the moiré potential in WTe2/WSe2 heterostructures by the intrinsic ferroelectricity in bilayer WTe2.
Gate-tunable heavy fermions in a moiré Kondo lattice
W. Zhao, B. Shen, Z. Tao, Z. Han, K. Kang, K. Watanabe, T. Taniguchi, K. F. Mak, and J. Shan, Nature 616, 61-65 (2023).
Creation of an artificial moiré Kondo lattice that endows the observations of gate-tunable heavy fermions and magnetic breakdown of Kondo singlets.
Exciton density waves in Coulomb-coupled dual moiré lattices
Y. Zeng, Z. Xia, R. Dery, K. Watanabe, T. Taniguchi, J. Shan, and K. F. Mak, Nature Mater. 22, 175-179 (2023).
Experimental observation of excitonic insulating states with spontaneous translational symmetry breaking in Coulomb-coupled double moiré lattices.
Evidence of frustrated magnetic interactions in a Wigner-Mott insulator
Y. Tang, K. Su, L. Li, Y. Xu, S. Liu, K. Watanabe, T. Taniguchi, J. C. Hone, C.-M. Jian, C. Xu, K. F. Mak, and J. Shan, Nature Nanotech. 18, 233-237 (2023).
Magneto-optical studies reveal competing ferromagnetic and antiferromagnetic interactions in the Wigner-Mott insulator at 2/3 filling of the WSe2/WS2 moiré superlattice.
(Review) Semiconductor moiré materials
K. F. Mak and J. Shan, Nature Nanotech. 17, 686–695 (2022).
We review the recent experimental progress on the physics of semiconductor moiré materials built on transition metal dichalcogenides.
A tunable bilayer Hubbard model in twisted WSe2
Y. Xu, K. Kang, K. Watanabe, T. Taniguchi, K. F. Mak, and J. Shan, Nature Nanotech. 17, 934-939 (2022).
AB-twisted bilayer WSe2 realizes a tunable bilayer Hubbard model that supports a range of competing electronic states and giant magnetoelectric response.
Dielectric catastrophe at the Wigner-Mott transition in a moiré superlattice
Y. Tang, J. Gu, S. Liu, K. Watanabe, T. Taniguchi, J. C. Hone, K. F. Mak, and J. Shan, Nature Commun. 13, 4271 (2022).
The application of an exciton Rydberg sensing technique reveals a dielectric catastrophe near the bandwidth-tuned metal-insulator transitions at both integer and fractional fillings of a semiconductor moiré superlattice.
van der Waals π Josephson junctions
K. Kang, H. Berger, K. Watanabe, T. Taniguchi, L. Forró, J. Shan, and K. F. Mak, Nano Lett. 22, 5510–5515 (2022).
van der Waals superconductor-ferromagnet-superconductor heterostructures demonstrate a thickness-driven 0-π transition in the Josephson current-phase relation.
Dipolar excitonic insulator in a moiré lattice
J. Gu, L. Ma, S. Liu, K. Watanabe, T. Taniguchi, J. C. Hone, J. Shan, and K. F. Mak, Nature Phys. 18, 395–400 (2022).
By combining optical spectroscopy and compressibility measurements, we demonstrate a dipolar excitonic insulator in a lattice formed by a Coulomb-coupled WSe2 monolayer and WSe2/WS2 moiré bilayer structure.
Coexisting ferromagnetic–antiferromagnetic state in twisted bilayer CrI3
Y. Xu, A. Ray, Y.-T. Shao, S. Jiang, K. Lee, D. Weber, J. E. Goldberger, K. Watanabe, T. Taniguchi, D. A. Muller, K. F. Mak, and J. Shan, Nature Nanotech. 17, 143-147 (2022).
We show experimental evidence of a noncollinear magnetic state with coexisting ferromagnetic and antiferromagnetic domains in twisted bilayer CrI3.
Quantum anomalous Hall effect from intertwined moiré bands
T. Li, S. Jiang, B. Shen, Y. Zhang, L. Li, Z. Tao, T. Devakul, K. Watanabe, T. Taniguchi, L. Fu, J. Shan, and K. F. Mak, Nature 600, 641-646 (2021).
A Mott insulator-to-quantum anomalous Hall insulator topological phase transition without bulk charge gap closure is observed in MoTe/WSe2 moiré superlattices.
Quantum oscillations in two-dimensional insulators induced by graphite gates
J. Zhu, T. Li, A. F. Young, J. Shan, and K. F. Mak, Phys. Rev. Lett. 127, 247702 (2021).
We demonstrate a mechanism for magnetoresistance oscillations in insulating states of various 2D materials arising from the capacitive coupling between the 2D layer and proximal graphite gates.
Giant anisotropic magnetoresistance in Ising superconductor-magnetic insulator tunnel junctions
K. Kang, S. Jiang, H. Berger, K. Watanabe, T. Taniguchi, L. Forró, J. Shan, & K. F. Mak, arXiv:2101.01327 (2021).
Giant anisotropic tunneling magnetoresistance is observed in a hybrid superconductor-magnetic insulator tunnel junction device made of NbSe2/CrBr3/NbSe2.
Strongly correlated excitonic insulator in atomic double layers
L. Ma, P. X. Nguyen, Z. Wang, Y. Zeng, K. Watanabe, T. Taniguchi, A. H. MacDonald, K. F. Mak, and J. Shan, Nature 598, 585-589 (2021).
Combined charge compressibility and exciton compressibility measurements show the emergence of a strongly correlated excitonic insulator in Coulomb-coupled semiconductor bilayers.
Continuous Mott transition in semiconductor moiré superlattices
T. Li, S. Jiang, T. Li, Y. Zhang, K. Kang, J. Zhu, K. Watanabe, T. Taniguchi, D. Chowdhury, L. Fu, J. Shan, and K. F. Mak, Nature 597, 350-354 (2021).
A continuous Mott transition from a non-magnetic Mott insulator to a Fermi liquid is observed by continuously tuning the bandwidth of MoTe2/WSe2 moiré superlattices by electric fields.
Charge-order-enhanced capacitance in semiconductor moiré superlattices
T. Li, J. Zhu, Y. Tang, K. Watanabe, T. Taniguchi, V. Elser, J. Shan, and K. F. Mak, Nature Nanotech. 16, 1068-1072 (2021).
The formation of charge-ordered states in semiconductor moiré materials significantly enhances the differential capacitance of the device over a broad range of filling factors.
Spin dynamics slowdown near the antiferromagnetic critical point in atomically thin FePS3
X.-X. Zhang, S. Jiang, J. Lee, C. Lee, K. F. Mak, and J. Shan, Nano Lett. 21, 5045-5052 (2021).
Optical pump-probe studies reveal significant slowdown of the spin dynamics in two-dimensional FePS3 near its antiferromagnetic critical point.
Two-fold symmetric superconductivity in few-layer NbSe2
A. Hamill, B. Heischmidt, E. Sohn, D. Shaffer, K.-T. Tsai, X. Zhang, X. Xi, A. Suslov, H. Berger, L. Forró, F. J. Burnell, J. Shan, K. F. Mak, R. M. Fernandes, K. Wang, and V. S. Pribiag, Nature Phys. 17, 949-954 (2021).
Combined transport and tunneling spectroscopy measurements show the presence of a superconducting state in few-layer NbSe2 that breaks the rotational symmetry of the crystal.
Stripe phases in WSe2/WS2 moiré superlattices
C. Jin, Z. Tao, T. Li, Y. Xu, Y. Tang, J. Zhu, S. Liu, K. Watanabe, T. Taniguchi, J. C. Hone, L. Fu, J. Shan, and K. F. Mak, Nature Mater. 20, 940–944 (2021).
Combined optical and compressibility measurements show the emergence of stripe crystals and electronic liquid crystals in semiconductor moiré materials.
Tunable Exciton-Optomechanical Coupling in Suspended Monolayer MoSe2
H. Xie, S. Jiang, D. A. Rhodes, J. C. Hone, J. Shan, and K. F. Mak, Nano Lett. 21, 2538-2543 (2021).
We have demonstrated tunable exciton-mechanical coupling and dynamical backaction effects in suspended MoSe2.
The marvels of moiré materials
E. Y. Andrei, D. K. Efetov, P. Jarillo-Herrero, A. H. MacDonald, K. F. Mak, T. Senthil, E. Tutuc, A. Yazdani, and A. F. Young, Nature Rev. Mater. 6, 201-206 (2021).
Creation of moiré bands in a monolayer semiconductor by spatially periodic dielectric screening
Y. Xu, C. Horn, J. Zhu, Y. Tang, L. Ma, L. Li, S. Liu, K. Watanabe, T. Taniguchi, J. C. Hone, J. Shan, and K. F. Mak, Nature Mater. 20, 645-649 (2021).
We have demonstrated remote printing of moiré potentials onto a monolayer semiconductor by spatially periodic dielectric screening of the semiconductor band gap.
Tuning layer-hybridized moiré excitons by the quantum-confined Stark effect
Y. Tang, J. Gu, S. Liu, K. Watanabe, T. Taniguchi, J. C. Hone, K. F. Mak, and J. Shan, Nature Nanotech. 16, 52-57 (2021).
Direct observation and electrical control of layer-hybridized moiré excitons in angle-aligned transition metal dichalcogenide heterostructures.
Correlated insulating states at fractional fillings of moiré superlattices
Y. Xu, S. Liu, D. A. Rhodes, K. Watanabe, T. Taniguchi, J. C. Hone, V. Elser, K. F. Mak, and J. Shan, Nature 587, 214-218 (2020).
Observation of an abundance of electron crystal states at fractional fillings of semiconductor moiré superlattices using a Rydberg sensing technique.
Electrical switching of valley polarization in monolayer semiconductors
L. Li, S. Jiang, Z. Wang, J. Shan, and K. F. Mak, Phys. Rev. Mater. 4, 104005 (2020).
We have demonstrated switching of valley polarization by electric fields in a magnetic proximitized semiconductor field-effect device.
Exchange magnetostriction in two-dimensional antiferromagnets
S. Jiang, H. Xie, J. Shan, and K. F. Mak, Nature Mater. 19, 1295–1299 (2020).
Magnetostrictive coupling driven by the interlayer antiferromagnetic exchange interaction in 2D CrI3 is probed by a mechanical method. Strain tuning of magnetism via inverse exchange magnetostriction is also demonstrated.
Gate-tunable spin waves in antiferromagnetic atomic bilayers
X.-X. Zhang, L. Li, D. Weber, J. Goldberger, K. F. Mak, and J. Shan, Nature Mater. 19, 838-842 (2020).
Sub-THz spin waves in antiferromagnetic bilayer CrI3 is probed by time-resolved Kerr rotation microscopy. Gate control of the coherent spin dynamics has also been demonstrated.
Imaging and control of critical fluctuations in two-dimensional magnets
C. Jin, Z. Tao, K. Kang, K. Watanabe, T. Taniguchi, K. F. Mak, and J. Shan, Nature Mater. 19, 1290–1294 (2020).
Direct imaging and control of critical spin fluctuations in a monolayer ferromagnetic insulator, demonstrating a new method for ultralow energy magnetic switching.
Left: Critical spin fluctuations imaged near Tc.
Right: Critical spin fluctuations imaged during cool down.
Simulation of Hubbard model physics in WSe2/WS2 moiré superlattices
Y. Tang, L. Li, T. Li, Y. Xu, S. Liu, K. Barmak, K. Watanabe, T. Taniguchi, A. H. MacDonald, J. Shan, and K. F. Mak, Nature 579, 353-358 (2020).
We simulate the phase diagram of triangular lattice Hubbard model using WSe2/WS2 moiré superlattices. A Mott insulating state and evidence of an antiferromagnetic-to-weak ferromagnetic quantum phase transition are observed.
Pressure-controlled interlayer magnetism in atomically thin CrI3
T. Li, S. Jiang, N. Sivadas, Z. Wang, Y. Xu, D. Weber, J. E. Goldberger, K. Watanabe, T. Taniguchi, C. J. Fennie, K. F. Mak, and J. Shan, Nature Mater. 18, 1303-1308 (2019).
Correlation between stacking order and magnetic states in 2D CrI3 has been examined by optical and transport measurements under hydrostatic pressure.
Evidence of high-temperature exciton condensation in two-dimensional atomic double layers
Z. Wang, D. A. Rhodes, K. Watanabe, T. Taniguchi, J. C. Hone, J. Shan, and K. F. Mak, Nature 574, 76-80 (2019).
We find evidence of Bose-Einstein condensation of interlayer excitons above 100 K in a van der Waals heterostructure consisting of 2D atomic double layers of transition metal chalcogenide semiconductors.
(Review) Probing and controlling magnetic states in 2D layered magnetic materials
K. F. Mak, J. Shan, and D. C. Ralph, Nature Reviews Physics (2019).
We review the basic properties of 2D layered magnetic materials, methods to read and write their magnetic states, and emerging spintronics device concepts.
Long valley lifetime of dark excitons in single-layer WSe2
Y. Tang, K. F. Mak, and J. Shan, Nature Commun. 10, 4047 (2019).
Integrating a gated monolayer WSe2 device into a layered material waveguide allows measurements of dark exciton photoluminescence and the valley lifetime. In contrast to bright excitons, dark excitons are found to have long valley relaxation lifetimes.
Spin tunnel field-effect transistors based on two-dimensional van der Waals heterostructures
S. Jiang, L. Li, Z. Wang, J. Shan, and K. F. Mak, Nature Electron. 2, 159-163 (2019).
A spin tunnel field-effect transistor with electric-field-controlled spin-dependent output is built based on a magnetic van der Waals' tunnel junction.
Nonlinear anomalous Hall effect in few-layer WTe2
K. Kang, T. Li, E. Sohn, J. Shan, and K. F. Mak, Nature Mater. 18, 324-328 (2019).
Transport measurements reveal the presence of a nonlinear anomalous Hall effect in a non-magnetic semimetal under zero magnetic field. The effect is originated from both intrinsic electronic Berry curvature dipoles and extrinsic spin-dependent scatterings.
(Review) Light-valley interactions in 2D semiconductors
K. F. Mak, D. Xiao, and J. Shan, Nature Photon. 12, 451-460 (2018).
We review the basic physics of valley-dependent light-matter interactions in 2D semiconductors, as well as recent experimental progress in manipulating the valley degree of freedom by light and by electric field.
Controlling magnetism in 2D CrI3 by electrostatic doping
S. Jiang, L. Li, Z. Wang, K. F. Mak, and J. Shan, Nature Nanotech. 13, 549-553 (2018).
Magnetic orders in 2D CrI3 can be effectively controlled by electrostatic doping, allowing electrical switching between ferromagnetic and antiferromagnetic states near zero magnetic field.
An unusual continuous paramagnetic-limited superconducting phase transition in 2D NbSe2
E. Sohn, X. Xi, W. He, S. Jiang, Z. Wang, K. Kang, J.-H. Park, H. Berger, L. Forró, K. T. Law, J. Shan, and K. F. Mak, Nature Mater. 17, 504-508 (2018).
Tunneling spectroscopy under high in-plane magnetic field reveals an unusual continuous paramagnetic-limited superconductor-metal phase transition, originating from a large in-plane spin susceptibility in 2D NbSe2 with Ising spins.
Valley-selective exciton bistability in a suspended monolayer semiconductor
H. Xie, S. Jiang, J. Shan, and K. F. Mak, Nano Lett. 18, 3213-3220 (2018).
Bistable exciton resonance has been demonstrated in a suspended monolayer semiconductor. The presence of an external magnetic field further allows control of the sample reflectivity by light helicity.
Electric-field switching of two-dimensional van der Waals magnets
S. Jiang, J. Shan, and K. F. Mak, Nature Mater. 17, 406-410 (2018).
An electric field in a van der Waals heterostructure switches a 2D magnetic material reversibly between an antiferromagnetic and a ferromagnetic state.
Strongly interaction-enhanced valley magnetic response in monolayer WSe2
Z. Wang, K. F. Mak, and J. Shan, Phys. Rev. Lett. 120, 066402 (2018).
Tuning the Fermi energy near the spin-split conduction bands of monolayer WSe2 leads to a strongly enhanced valley Zeeman effect due to electron-electron interactions.
Electrical tuning of interlayer exciton gases in WSe2 bilayers
Z. Wang, Y.-H. Chiu, K. Honz, K. F. Mak, and J. Shan, Nano Lett. 18, 137-143 (2018).
A vertical electric field applied to bilayer WSe2 generates long-lived interlayer excitons with a widely tunable resonance energy.
Valley magnetoelectricity in single-layer MoS2
J. Lee, Z. Wang, H. Xie, K. F. Mak, and J. Shan, Nature Mater. 16, 887-891 (2017).
Breaking the three-fold rotational symmetry of single-layer MoS2 by strain allows the generation of valley magnetization by an electrical current.
Valley- and spin-polarized Landau levels in monolayer WSe2
Z. Wang, J. Shan, and K. F. Mak, Nature Nanotech. 12, 144–149 (2017).
The fabrication of high-quality WSe2 monolayers makes it possible to access the fully valley- and spin-polarized structure of Landau levels theoretically predicted for transition-metal dichalcogenides.
Gate tuning of electronic phase transitions in two-dimensional NbSe2
X. Xi, H. Berger, L. Forro, J. Shan, and K. F. Mak, Phys. Rev. Lett. 117, 106801 (2016).
Reversible tuning of superconductivity and CDW order in atomically thin NbSe2 is experimentally demonstrated by an ionic liquid gate.
K. F. Mak and J. Shan, Nature Photon. 10, 216-226 (2016).
We review the electronic and optical properties and the recent progress in applications of 2D semiconductor transition metal dichalcogenides with emphasis on strong excitonic effects, and spin- and valley-dependent properties.
Electrical control of the valley Hall effect in bilayer MoS2 transistors
J. Lee, K. F. Mak, and J. Shan, Nature Nanotech. 11, 421-425 (2016).
The valley Hall effect in bilayer MoS2 transistors can be controlled using a gate voltage and the induced valley polarization imaged with Kerr microscopy.
Ising pairing in superconducting NbSe2 atomic layers
X. Xi, Z. Wang, W. Zhao, J.-H. Park, K. T. Law, H. Berger, L. Forro, J. Shan, and K. F. Mak, Nature Phys. 12, 139-143 (2016).
The superconducting properties of NbSe2 as it approaches the monolayer limit are investigated by means of magnetotransport measurements, uncovering evidence of spin–momentum locking.
Strongly enhanced charge-density-wave order in monolayer NbSe2
X. Xi, L. Zhao, Z. Wang, H. Berger, L. Forro, J. Shan, and K. F. Mak, Nature Nanotech. 10, 765-769 (2015).
Enhanced electron–phonon interactions in mono- and few-layer NbSe2 result in a significantly increased transition temperature of charge density waves compared with values in the bulk.
Tightly bound excitons in monolayer WSe2
K. He, N. Kumar, L. Zhao, Z. Wang, K.F. Mak, H. Zhao, and J. Shan, Phys. Rev. Lett. 113, 026803 (2014).
Exciton binding energy and excited states in monolayer WSe2 are investigated using the combined linear absorption and two-photon photoluminescence excitation spectroscopy.
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