15 articles
1T′-WTe2
1T′-WTe2 is tungsten ditelluride in its distorted octahedral phase, a layered transition metal dichalcogenide where tungsten atoms form zigzag chains; its monolayer is a candidate quantum spin Hall insulator.
Amorphous topological insulator
An amorphous topological insulator is a topological insulating phase in a system with no long-range positional order, showing band topology survives without crystalline symmetry; disorder can even induce it.
Antiferromagnetic topological insulator
An antiferromagnetic topological insulator is a magnetic insulator whose band structure is topologically nontrivial despite zero net magnetization, defined theoretically in 2010 and first realized in MnBi2Te4.
Axion insulator
An axion insulator is a magnetic topological phase of matter in which each gapped surface carries a half-quantized anomalous Hall conductance, with leading candidate materials such as MnBi2Te4.
Bi2Se3 topological insulator
Bi2Se3 (bismuth selenide) is a three-dimensional topological insulator with a narrow bulk gap of about 0.3 eV and spin-orbit-inverted bands, whose surfaces conduct through a single Dirac cone while selenium vacancies make most crystals n-type.
Hidden spin polarization
Hidden spin polarization, introduced in 2014 by Zhang, Liu, Luo, Freeman, and Zunger, is spin polarization of individual crystal sectors that cancels globally in centrosymmetric materials.
Higher-order topological insulator
A higher-order topological insulator (HOTI) is an insulating material whose surfaces are gapped but which hosts protected states at corners or hinges, predicted in 2017.
Higher-order topological insulator in bismuth
Bismuth is a higher-order topological insulator, a crystalline solid with insulating bulk and surfaces but conducting, topologically protected hinge modes, established in a 2018 Nature Physics study.
Magnetic topological insulator
A magnetic topological insulator is a material combining a topological insulator's band structure with internal magnetic order, enabling the quantum anomalous Hall effect, observed in MnBi2Te4 up to 6.5 K.
MnBi4Te7
MnBi4Te7 is a layered crystal in the MnBi2nTe3n+1 family, an intrinsic antiferromagnetic topological insulator that orders below about 13 K and saturates in a small field of about 0.22 T.
Monolayer WTe2
Monolayer WTe2, or tungsten ditelluride, is a single atomic layer in which the quantum spin Hall effect, a two-dimensional topological insulator state, was first demonstrated experimentally in 2017, with gate-tuned superconductivity below about 1 K.
Stanene
Stanene is a two-dimensional monolayer of tin atoms in a buckled honeycomb lattice, the tin analog of graphene, predicted to be a topological insulator with a quantum spin Hall effect at room temperature.
Topological Anderson insulator
A topological Anderson insulator is a quantum phase of matter in which random disorder turns a trivial insulator into a topological insulator with protected edge states.
Topological insulator surface states
Topological insulator surface states are gapless, spin-momentum-locked electronic states forming a single Dirac cone protected by time-reversal symmetry, experimentally demonstrated by ARPES on Bi2Se3-family materials from 2008 onward.
Topological Kondo insulator
A topological Kondo insulator is an insulating state whose gap comes from Kondo exchange between itinerant electrons and local magnetic moments, proposed in 2010 for SmB6.