Publications (12)
Valley-Polarized quantum Hall phase in a strain-controlled Dirac system
G. Krizman, J. Bermejo-Ortiz, T. Zakusylo +9
In multivalley systems, the valley pseudospin offers rich physics going from encoding of information by its polarization (valleytronics), to exploring novel phases of matter when i…
Spontaneous Breaking of the SU(3) Flavor Symmetry in a Quantum Hall Valley Nematic
G. Krizman, A. Kazakov, C. -W. Cho +10
Two-dimensional quantum materials can host original electronic phases that arise from the interplay of electronic correlations, symmetry and topology. In particular, the spontaneou…
Determination of the crystal field splitting energy in Cd3As2 using magnetooptics
G. Krizman, T. Schumann, S. Tchoumakov +4
Symmetry considerations are of extreme importance to the topological properties of crystals. A crystal field splitting δ yields Dirac nodes near the Brillouin zone center in Cd3As…
Avoided level crossing at the magnetic field induced topological phase transition due to spin-orbital mixing
G. Krizman, B. A. Assaf, M. Orlita +7
In 3D topological insulators, an effective closure of the bulk energy gap with increasing magnetic field expected at a critical point can yield a band crossing at a gapless Dirac n…
Observation of Weyl and Dirac fermions at smooth topological Volkov-Pankratov heterojunctions
J. Bermejo-Ortiz, G. Krizman, R. Jakiela +6
Weyl and Dirac relativistic fermions are ubiquitous in topological matter. Their relativistic character enables high energy physics phenomena like the chiral anomaly to occur in so…
Negative longitudinal magnetoresistance from anomalous N=0 Landau level in topological materials
B. A. Assaf, T. Phuphachong, E. Kampert +8
Negative longitudinal magnetoresistance (NLMR) is shown to occur in topological materials in the extreme quantum limit, when a magnetic field is applied parallel to the excitation…
Linear Temperature Variation of the Penetration Depth in YBCO Thin Films
L. A. de Vaulchier, J. P. Vieren, Y. Guldner +4
We have measured the penetration depth on thin films from transmission at 120, 330 and 510~GHz, between 5 and 50~K. Our data yield simultaneously t…
Low temperature penetration depth and the effect of quasi-particle scattering measured by millimeter wave transmission in YBaCuO thin films
S. Djordjevic, L. A. de Vaulchier, N. Bontemps +7
Measurement of the penetration depth as a function of temperature using millimeter wave transmission in the range 130-500GHz are reported for three YBCO thin films. The experiment…
Massive and massless Dirac fermions in Pb1-xSnxTe topological crystalline insulator probed by magneto-optical absorption
B. A. Assaf, T. Phuphachong, V. V. Volobuev +5
Dirac fermions in condensed matter physics hold great promise for novel fundamental physics, quantum devices and data storage applications. IV-VI semiconductors, in the inverted re…
Miniband engineering and topological phase transitions in topological - normal insulator superlattices
G. Krizman, B. A. Assaf, G. Bauer +3
Periodic stacking of topologically trivial and non-trivial layers with opposite symmetry of the valence and conduction bands induces topological interface states that, in the stron…
Dirac parameters and topological phase diagram of Pb1-xSnxSe from magneto-spectroscopy
G. Krizman, B. A. Assaf, T. Phuphachong +4
Pb1-xSnxSe hosts 3D massive Dirac fermions across the entire composition range for which the crystal structure is cubic. In this work, we present a comprehensive experimental mappi…
Tunable Dirac interface states in topological superlattices
G. Krizman, B. A. Assaf, T. Phuphachong +6
Relativistic Dirac fermions are ubiquitous in condensed matter physics. Their mass is proportional to the material energy gap and the ability to control and tune the mass has becom…