Update problems.md

Author: mtian8

docs/problems.md

@@ -41,7 +41,7 @@
 
 48_MEELS_conversion
 
-50_Replica_symmetry_breaking
+**50_Replica_symmetry_breaking**
 
 62_dmrg
 
@@ -64,13 +64,13 @@
 
 8_Spatial_filters_III
 
-14_Brownian_motion_in_the_optical_tweezer
+**14_Brownian_motion_in_the_optical_tweezer**
 
 22_Beam_translation_reexpansion
 
 28_Gaussian_Beam_Intensity
 
-32_Multiparticle_dynamics_in_the_optical_tweezer_array
+**32_Multiparticle_dynamics_in_the_optical_tweezer_array**
 
 37_ray_optics_spherical_aberration
 
@@ -109,7 +109,7 @@
 70_neutrino_oscillation
 
 ## Quantum Chemistry
-12_Schrodinger_DFT_with_SCF
+**12_Schrodinger_DFT_with_SCF**
 
 30_helium_slater_jastrow_wavefunction
 
@@ -152,7 +152,7 @@
 
 34_PN_diode_band_diagram
 
-35_Quantum_Dot_Absorption_Spectrum
+**35_Quantum_Dot_Absorption_Spectrum**
 
 36_Quasi_Fermi_levels_of_photo_resistor_out_of_equilibrium